RU2680971C1 - Method for processing ofdm signals and device therefor - Google Patents

Abstract

FIELD: electrical communication engineering.SUBSTANCE: invention relates to communication technology and is intended for processing OFDM signals under the influence of intra-system interference caused by asynchronous operation of transmitters. Invention discloses in particular a method for processing OFDM signals, according to which the quadrature components of the spectra of OFDM signals are first calculated along with the gates of their arrival time for three carrier frequencies (the main and neighboring high and low frequencies) with correction of the carrier frequency offset of the quadrature components of the OFDM signals, and then the quadrature components of the spectrum of the OFDM signal are corrected at the carrier frequency of the main signal using the optimal measurement algorithm on the basis of the obtained information about the quadrature components of the OFDM signal spectra and the time gates of their arrival for all three carrier frequencies.EFFECT: technical result is to increase the reliability of communication by reducing the influence of intra-system interference, which reduces the variance of the quadrature components of the OFDM spectrum of a signal transmitted at the carrier frequency of the main signal.5 cl, 10 dwg

Description

The invention relates to communication technology and can be used to process OFDM signals, under the influence of intra-system interference caused by asynchronous operation of transmitting devices.

A known reception method, comprising the steps of detecting a first preamble signal from a frame signal having a structure containing a first preamble signal indicating a section of a frame, a second preamble signal containing control information used in processing the data signal, and a data signal, when the signal of the second preamble is transmitted after the signal of the first preamble, the signal of the second preamble is accumulated, upon detecting the signal of the first preamble, the total amount of data is accumulated, equivalent to the largest possible total amount of data, as the total amount of data of the signal of the second preamble, while the data is located immediately after the specified signal of the first preamble, and they process the data signal based on the control information contained in the accumulated signal of the second preamble, while the data signal contains in the same frame as the indicated accumulated signal of the second preamble. (Yokokawa Takashi, READY Yuken, KOBAYASHI Kenichi. Reception device, method of reception and program. RF patent No. 2597001. Prior. March 14, 2011, Publish. September 10, 2016, Bull. No. 25).

A receiving device is known that comprises a detection unit configured to detect a first preamble signal from a frame signal having a frame structure containing a first preamble signal indicating a frame section, a second preamble signal containing control information used in processing the data signal, and a data signal wherein the signal of the second preamble is transmitted after the signal of the first preamble; an accumulation unit configured to accumulate a signal of the second preamble upon detecting a signal of the first preamble; and a processing unit configured to process the data signal based on control information contained in the second preamble signal accumulated in the accumulation unit, wherein the data signal is contained in the same frame as the specified second preamble signal accumulated in the accumulation unit, this accumulation unit is configured to accumulate the total amount of data equivalent to the largest possible total amount of data as the total amount of data of the signal of the second preamble, wherein said data is located immediately after said first preamble signal. (Yokokawa Takashi, READY Yuken, KOBAYASHI Kenichi. Reception device, method of reception and program. RF patent No. 2597001. Prior. March 14, 2011, Publish. September 10, 2016, Bull. No. 25).

Closest to the proposed OFDM signal processing method (prototype) is a signal processing method comprising the steps of: calculating, which performs a conversion calculation, configured to Fourier transform an OFDM signal in a time domain, i.e., an orthogonal multiplexed signal with frequency division multiplexing into a signal OFDM in the frequency domain; processing that performs detection of carrier frequency offset, configured to detect an estimate of the carrier frequency offset, which is a carrier error used to demodulate the OFDM signal; correction of the carrier frequency offset, which performs the correction of the carrier frequency offset, configured to correct the carrier frequency offset for the OFDM signal in the frequency domain, in accordance with the estimated carrier frequency offset, in which the OFDM signal contains the first preamble signal and the second preamble signal following the first preamble signal, and at the calculation stage, the conversion of the second preamble signal is calculated in parallel with the detection of the carrier frequency offset performed at the processing stage using he first preamble signal. (Kobayashi Kenichi, Goto Yuken, Okamoto Takuya, Lahlan Bruce Michael. Device and method for processing signals. RF patent No. 2549205. Prior. July 24, 2009, Publish. 04/20/2015, Bull. No. 11).

Closest to the proposed OFDM signal processing device (prototype) are a signal processing device comprising a calculation device for performing a conversion calculation configured to Fourier transform an OFDM signal in a time domain, i.e., a signal with orthogonal frequency division multiplexing into an OFDM signal in frequency areas; a processing device for performing carrier frequency offset detection, configured to detect a carrier frequency offset estimate, which is an error of the carrier frequency used to demodulate the OFDM signal; and a carrier frequency offset correction device for performing a carrier frequency offset correction adapted to correct a carrier frequency offset of an OFDM signal in a frequency domain in accordance with an estimate of a carrier frequency offset in which the OFDM signal comprises a first preamble signal and a second preamble signal following the first preamble signal, and the calculation device calculates the conversion of the second preamble signal in parallel with the detection of the carrier frequency offset performed by the device processing using the first preamble signal. (Kobayashi Kenichi, Goto Yuken, Okamoto Takuya, Lahlan Bruce Michael. Device and method for processing signals. RF patent No. 2549205. Prior. July 24, 2009, Publish. 04/20/2015, Bull. No. 11).

The disadvantage of this device and method of signal processing is to reduce the reliability of communication with asynchronous transmission of similar signals at adjacent carrier frequencies due to the influence of intra-system interference.

The technical problem is the need to reduce the influence of intra-system interference arising from the asynchronous transmission of similar signals at adjacent carrier frequencies due to the joint processing of all signals.

The technical result of the proposed method of processing OFDM signals and a device for its implementation is to increase the reliability of communication by reducing the influence of intra-system interference, which provides a reduction in the variance of the estimates of the quadrature components of the spectrum of the OFDM signal transmitted at the carrier frequency of the main signal by correcting these quadrature components of the spectrum of the OFDM signal by the basis of the optimal measurement algorithm for the joint processing of the spectra of OFDM signals present at three carrier frequencies (main and by the neighboring upper and lower frequencies).

The technical result in the proposed method of processing OFDM signals, namely, in the step of calculating the quadrature components of the spectrum of the OFDM signal, the carrier frequency of the quadrature components of the OFDM signal is first corrected, based on the adjusted quadrature components of the OFDM signal, the OFDM signal preamble is processed to determine the arrival time strobe the quadrature components of the OFDM signal and the carrier frequency offset of the corrected quadrature components of the OFDM signal, the resulting carrier frequency offset being the corrected quadrature components of the OFDM signal are used to correct the carrier frequency of the quadrature components of the OFDM signal, then the quadrature components of the spectrum of the OFDM signal are calculated using the fast Fourier transform using the adjusted quadrature components of the OFDM signal and the time strobe of the arrival of the quadrature components of the OFDM signal, this stage of calculation the quadrature components of the spectrum of the OFDM signal are also performed for adjacent carrier frequencies from the upper and lower frequencies from the main about the signal, and also enter the stage of correction of the quadrature components of the spectrum of the OFDM signal, in which the values of the quadrature components of the spectrum of the OFDM signal at the carrier frequency of the main signal are corrected using the optimal measurement algorithm based on the information on the quadrature components of the spectra of all OFDM signals and the arrival time gates obtained at the stage of calculating the quadrature components of the spectrum of the OFDM signal for all three carrier frequencies.

The technical result in the proposed OFDM signal processing device, comprising a block for calculating the quadrature components of the spectrum of the OFDM signal, having two inputs of the quadrature components of the OFDM signal, which are simultaneously inputs of the device for the quadrature components of the OFDM signal at the carrier frequency of the main signal, and three outputs, the first two of which are the outputs of the quadrature components of the spectrum of the OFDM signal, and the third output is the output of the time strobe of the arrival of the quadrature components of the OFDM signal, and the calculation unit of the quadrature components the OFDM signal spectrum contains a carrier frequency correction block of the quadrature OFDM signal components, which has three inputs and two outputs, the first two inputs of which are the inputs of the OFDM signal quadrature components, the third input of which is the carrier frequency shift input of the adjusted OFDM signal quadrature components, and both outputs, which are the outputs of the adjusted quadrature components of the OFDM signal, a preamble processing unit having two inputs and two outputs, the inputs of which are inputs of the adjusted quadrature to component of an OFDM signal, the first output of which is the output of the time strobe of the arrival of the quadrature components of the OFDM signal, and the second output is the carrier frequency offset of the adjusted quadrature components of the OFDM signal, and a fast Fourier transform unit having three inputs and two outputs, the first two inputs of which are inputs adjusted quadrature components of the OFDM signal, the third input of which is the input of the time strobe of the arrival of the quadrature components of the OFDM signal, and both outputs, which are the outputs of the quadrature components the spectral component of the OFDM signal, and the inputs of the quadrature OFDM signal components of the carrier frequency correction block of the quadrature OFDM signal components are the inputs of the quadrature component calculation block of the OFDM signal spectrum, and the carrier frequency shift input of the adjusted quadrature OFDM signal of the carrier frequency correction block of the quadrature OFDM signal component is connected to the corresponding output of the preamble processing unit, the outputs of the adjusted quadrature OFDM components of the signal of the correction block of the carrier frequency of the quadrature com the OFDM signal is connected to the corresponding inputs of the preamble processing block and the fast Fourier transform block, the output time gate of the quadrature components of the OFDM signal of the preamble processing block is connected to the corresponding input of the fast Fourier transform block and is the output of the quadrature component calculation block of the OFDM signal spectrum, and the outputs of the quadrature components the OFDM spectrum of the signal of the fast Fourier transform block are the outputs of the block of calculation of the quadrature components of the spectrum of the OFDM signal, the fact that two more of the same blocks for calculating the quadrature components of the spectrum of the OFDM signal are introduced into it, the inputs of the second block for calculating the quadrature components of the spectrum of the OFDM signal are inputs of the device for the quadrature components of the OFDM signal at the adjacent carrier frequency from the upper frequencies from the main signal, and the inputs the third block of the calculation of the quadrature components of the spectrum of the OFDM signal are the inputs of the device for the quadrature components of the OFDM signal at an adjacent carrier frequency from the low frequencies from the main signal and the block of correction of the quadrature components of the spectrum of the OFDM signal, which has three groups of inputs for each of the carrier frequencies, three inputs in each group, the first two of which are inputs of the quadrature components of the spectrum of the OFDM signal, and the third input is the input of the time strobe input of the quadrature OFDM components signal at the corresponding carrier frequency, and two outputs, which are outputs of the adjusted quadrature components of the OFDM spectrum of the signal at the carrier frequency of the main signal, the inputs of each of the groups of the quadrature correction block the spectrum component of the OFDM signal is connected to the corresponding outputs of the corresponding blocks for calculating the quadrature components of the spectrum of the OFDM signal, and the outputs of the block of quadrature correction components of the spectrum of the OFDM signal are the corresponding outputs of the device.

The block of correction of the quadrature components of the spectrum of the OFDM signal may include a block of combining the quadrature components of the spectrum of the OFDM signals, a block for calculating the delays of the quadrature components of the OFDM signal and a correction block of the combined quadrature components of the spectrum of the OFDM signal, the first two inputs of which are inputs of the quadrature components of the spectrum of the OFDM signal of each of the three groups of the block combining the quadrature components of the spectra of OFDM signals, are designed to connect to the corresponding outputs of the corresponding blocks of the calculation quadrature components of the spectrum of the OFDM signal, and the third inputs, which are inputs of the time strobe of the arrival of quadrature components of the OFDM signal of each group, are connected to the corresponding inputs of the block for calculating the delay of the quadrature components of the OFDM signals and are designed to connect to the corresponding outputs of the corresponding blocks for calculating the quadrature components of the spectrum of the OFDM signal , the outputs of the block combining quadrature components of the spectra of OFDM signals are connected to the corresponding inputs of the combined quadrature components OFDM signal spectra of the correction block of the combined quadrature components of the OFDM signal spectrum, delay outputs of the quadrature OFDM components of the signal at the adjacent carrier frequency from the main signal from the arrival time of the quadrature components of the OFDM signal at the carrier frequency of the main signal and the delay of the quadrature components of the OFDM signal on the neighboring carrier frequency from the low frequencies from the main signal relative to the time of arrival of the quadrature components of the OFDM signal at the carrier frequency of the main signal la calculation unit delays quadrature component OFDM signals are connected to respective inputs of the correction unit combined quadrature components of the spectrum OFDM signal whose outputs are appropriate device outputs.

The unit for combining the quadrature components of the spectra of OFDM signals can contain twenty memory registers having two inputs, the first of which is a data input, and the second one is a recording control input and one output, which is a data output, the data of the memory registers data one through six designed to connect to the corresponding outputs of the quadrature components of the spectrum of the OFDM signal of the corresponding blocks for calculating the quadrature components of the spectrum of the OFDM signal, the input control recording the first memory register It is connected to the corresponding input of the second memory register, the seventh to sixteenth memory registers and is used to connect the arrival time gate of the quadrature OFDM signal components of the first block for calculating the quadrature components of the OFDM signal spectrum, the inputs of which are intended to receive the quadrature OFDM signal components at the carrier frequency of the main signal , the recording control input of the third memory register is connected to the corresponding inputs of the fourth, seventeenth and eighteenth memory registers and assigned to connect to the output gate of the time of arrival of the quadrature OFDM components of the signal of the second block for calculating the quadrature components of the OFDM spectrum, the inputs of which are designed to receive the quadrature components of the OFDM signal on an adjacent carrier frequency from the high frequencies from the main signal, the recording control input of the fifth memory register is connected to the corresponding inputs of the sixth, nineteenth and twentieth memory registers and is designed to connect to the output of the strobe of the time of arrival of the quadrature components t OFDM signal of the third block for calculating the quadrature components of the spectrum of the OFDM signal, the inputs of which are for receiving quadrature components, the OFDM signal at an adjacent carrier frequency from the low frequencies from the main signal, the data outputs of the first and second memory registers are connected to the data inputs of the seventh and eighth memory registers accordingly, the data outputs of the third and fourth memory registers are connected to the data inputs of the ninth and tenth memory registers, respectively, as well as to the data inputs of the seventeenth eighteenth memory registers, respectively, the data outputs of the fifth and sixth memory registers are connected to the data inputs of the thirteenth and fourteenth memory registers, respectively, as well as to the data inputs of the nineteenth and twentieth memory registers, respectively, the data outputs of the seventeenth and eighteenth memory registers are connected to the data inputs of the eleventh and twelfth registers memory, respectively, the data outputs of the nineteenth and twentieth memory registers are connected to the data inputs of the fifteenth and sixteenth of the memory registers, respectively, and the data outputs of the seventh, ninth, eleventh, thirteenth and fifteenth memory registers are combined, as are the data outputs of the eighth, tenth, twelfth, fourteenth and sixteenth memory registers and are outputs of the combined quadrature components of the OFDM spectra of signals of the block combining the quadrature components of the spectra OFDM signals.

The block for calculating the delays of the quadrature components of OFDM signals can contain two RS flip-flops, a clock generator block, two binary controlled counters and two memory registers, the installation input of the first RS trigger connected to the corresponding input of the second RS trigger, reset inputs of both binary controlled counters, recording control inputs of both memory registers and is designed to connect to the output of the strobe the time of arrival of the quadrature components of the OFDM signal of the first block for computing quadrature components of the spectrum of the OFDM signal the inputs of which are intended for the arrival of the quadrature components of the OFDM signal at the carrier frequency of the main signal, the reset input of the first RS trigger is used to connect the output gate of the arrival times of the quadrature components of the OFDM signal to the second block for calculating the quadrature components of the spectrum of the OFDM signal, the inputs of which are intended for the arrival of the quadrature components of the OFDM signal at an adjacent carrier frequency from the side, high frequencies from the main signal, and the reset input of the second RS trigger is designed to connect to the output to the arrival time gate of the quadrature components of the OFDM signal of the third block for calculating the quadrature components of the spectrum of the OFDM signal, the inputs of which are designed to receive the quadrature components of the OFDM signal at an adjacent carrier frequency from the low frequency side of the main signal, the status outputs of both RS triggers are connected to the binary counters respectively, the clock inputs of both binary controlled counters are connected to the output of the clock generator, the status outputs of both binary controls The counters are connected to the inputs of the data of the memory registers, respectively, the data outputs of both memory registers are the delay outputs of the quadrature components of the OFDM signal at an adjacent carrier frequency from the main signal from the main signal relative to the time of arrival of the quadrature components of the OFDM signal at the carrier frequency of the main signal and the delay of the quadrature OFDM components the signal at an adjacent carrier frequency from the low frequencies from the main signal relative to the time of arrival of the quadrature components of the OFDM signal at esuschey basic frequency block signal delay calculation quadrature component OFDM signals.

In FIG. 1 is a diagram of an OFDM signal processing apparatus.

In FIG. 2 is a diagram of a block for calculating the quadrature components of the spectrum of the OFDM signal 1 ;.

In FIG. 3 is a block diagram of a quadrature correction component of the spectrum of the OFDM signal 2.

In FIG. 4 shows a block diagram for combining the quadrature components of the spectra of OFDM signals 6.

In FIG. 5 is a diagram of a block for calculating delays of quadrature components of OFDM signals 7.

In FIG. 6 shows the operation algorithm of the carrier frequency correction block of the quadrature components of the OFDM signal 3.

In FIG. 7 shows the algorithm of the processing unit of the preamble 4.

In FIG. 8 shows the algorithm of the fast Fourier transform block 5.

In FIG. 9 shows the operation algorithm of the correction block of the combined quadrature components of the spectrum of the OFDM signal 8.

In FIG. 10 shows the algorithm of the matrix inversion procedure included in the operation algorithm of the unit for correction of the combined quadrature components of the spectrum of the OFDM signal 8 shown in FIG. 9.

The OFDM signal processing apparatus illustrated in FIG. 1, contains three blocks for calculating the quadrature components of the spectrum of the OFDM signal, block 1 ₁ - on the carrier frequency of the main signal, block 1 ₂ - on the adjacent carrier frequency from the high frequencies from the main signal and block 1 ₃ - on the adjacent carrier frequency from the low frequencies from the main signal, each of which has two inputs of the quadrature OFDM signal components, which are simultaneously inputs of the device for the quadrature OFDM signal components at the corresponding carrier frequency, and three outputs, the first two of which are quad outputs component of the spectrum of the OFDM signal, and the third output is the output of the time strobe of the arrival of the quadrature components of the OFDM signal, and the block of correction of the quadrature components of the spectrum of the OFDM signal 2, which has three groups of inputs for each of the carrier frequencies, three inputs in each group, the first two of which are the inputs of the quadrature components of the spectrum of the OFDM signal, and the third input is the input of the time strobe of the arrival of the quadrature components of the OFDM signal at the corresponding carrier frequency, and two outputs that are outputs of the corrected quadrature components of the spec OFDM signal at the carrier frequency of the main signal, the inputs of each of the groups of the block of correction of the quadrature components of the spectrum of the OFDM signal 2 connected to the corresponding outputs of the corresponding blocks of calculation of the quadrature components of the spectrum of the OFDM signal 1 ₁ , 1 ₂ , 1 ₃ , and the outputs of the block of the correction of quadrature components of the spectrum OFDM signal 2 are the corresponding outputs of the device.

представленный на фиг. 2, содержит блок коррекции несущей частоты квадратурных компонент OFDM сигнала 3, имеющий три входа и два выхода, первые два входа которого являются входами квадратурных компонент OFDM сигнала, третий вход которого является входом сдвига несущей частоты скорректированных квадратурных компонент OFDM сигнала, а оба выхода, которого являются выходами скорректированных квадратурных компонент OFDM сигнала, блок обработки преамбулы 4, имеющий два входа и два выхода, входы которого являются входами скорректированных квадратурных компонент OFDM сигнала, первый выход которого является выходом строба времени прихода квадратурных компонент OFDM сигнала, а второй выход - выходом сдвига несущей частоты скорректированных квадратурных компонент OFDM сигнала, и блок быстрого преобразования Фурье 5, имеющий три входа и два выхода, первые два входа которого являются входами скорректированных квадратурных компонент OFDM сигнала, третий вход которого является входом строба времени прихода квадратурных компонент OFDM сигнала, а оба выхода, которого являются выходами квадратурных компонент спектра OFDM сигнала, причем, входы квадратурных компонент OFDM сигнала блока коррекции несущей частоты квадратурных компонент OFDM сигнала 3 являются входами блока вычисления квадратурных компонент спектра OFDM сигнала 1_i, а вход сдвига несущей частоты скорректированных квадратурных компонент OFDM сигнала блока коррекции несущей частоты квадратурных компонент OFDM сигнала 3 соединен с соответствующим выходом блока обработки преамбулы 4, выходы скорректированных квадратурных компонент OFDM сигнала блока коррекции несущей частоты квадратурных компонент OFDM сигнала 3 соединены с соответствующими входами блока обработки преамбулы 4 и блока быстрого преобразования Фурье 5, выход строба времени прихода квадратурных компонент OFDM сигнала блока обработки преамбулы 4 соединен с соответствующим входом блока быстрого преобразования Фурье 5 и является выходом блока вычисления квадратурных компонент спектра OFDM сигнала 1_i, а выходы квадратурных компонент спектра OFDM сигнала блока быстрого преобразования Фурье 5 являются выходами блока вычисления квадратурных компонент спектра OFDM сигнала 1_i.Block for calculating the quadrature components of the spectrum of the OFDM signal 1 _i , where

shown in FIG. 2, comprises a carrier frequency correction block of the quadrature components of the OFDM signal 3, having three inputs and two outputs, the first two inputs of which are inputs of the quadrature components of the OFDM signal, the third input of which is the carrier offset of the corrected quadrature components of the OFDM signal, and both outputs, of which are the outputs of the adjusted quadrature components of the OFDM signal, the preamble processing unit 4, having two inputs and two outputs, the inputs of which are inputs of the adjusted quadrature components of the OFDM signal, whose first output is the output of the arrival time strobe of the quadrature components of the OFDM signal, and the second output is the carrier frequency shift output of the adjusted quadrature OFDM signal components, and the fast Fourier transform unit 5, which has three inputs and two outputs, the first two inputs of which are the inputs of the corrected quadrature components OFDM signal, the third input of which is the input of the time strobe of the arrival of the quadrature components of the OFDM signal, and both outputs, which are outputs of the quadrature components of the OFDM spectrum the inputs of the quadrature component of the OFDM signal of the carrier frequency correction block of the quadrature component of the OFDM signal 3 are inputs of the quadrature component calculation unit of the OFDM spectrum signal 1 _i , and the carrier frequency shift input of the adjusted quadrature OFDM signal of the carrier frequency correction block of the quadrature OFDM signal component 3 is connected with the corresponding output of the processing block of the preamble 4, the outputs of the adjusted quadrature OFDM components of the signal of the block of the correction of the carrier frequency of the quadrature OFDM components ala 3 connected to the respective preamble processing block inputs 4 and a block fast Fourier transform 5, the output strobe arrival time quadrature OFDM processing unit of the signal component of the preamble 4 connected to a corresponding input of the fast Fourier transform 5, and is output calculation unit quadrature component spectrum OFDM signal 1 _i and the outputs of the quadrature components of the OFDM spectrum of the signal of the fast Fourier transform unit 5 are outputs of the calculation unit of the quadrature components of the spectrum of the OFDM signal 1 _i .

The quadrature component correction block of the OFDM spectrum of signal 2 shown in FIG. 3 may comprise a unit for combining the quadrature components of the OFDM signal spectra 6, a unit for calculating the delays of the quadrature components of the OFDM signals 7 and a correction unit for the combined quadrature components of the spectrum of the OFDM signal 8, the first two inputs being inputs of the quadrature components of the spectrum of the OFDM signal of each of the three groups of the combining unit the quadrature components of the spectra of the OFDM signals 6 are connected to the corresponding outputs of the corresponding blocks for calculating the quadrature components of the spectrum of the OFDM signal 1 ₁ , 1 ₂ , 1 ₃ , and the third inputs are the inputs of the time strobe of arrival of the quadrature components of the OFDM signal of each group are connected to the corresponding inputs of the block for calculating the delays of the quadrature components of the OFDM signals 7 and the corresponding outputs of the corresponding blocks for calculating the quadrature components of the spectrum of the OFDM signal 1 ₁ , 1 ₂ , 1 ₃ , the outputs of the block combining the quadrature components OFDM signal spectra 6 are connected to the corresponding inputs of the combined quadrature components of the OFDM signal spectra of the correction block of the combined quadrature components of the OFDM signal spectrum a 8, the delay outputs of the quadrature components of the OFDM signal at an adjacent carrier frequency from the upper frequency from the main signal relative to the time of arrival of the quadrature components of the OFDM signal at the carrier frequency of the main signal and the delay of the quadrature components of the OFDM signal at an adjacent carrier frequency from the lower frequency from the main signal relative to the time of arrival of the quadrature components of the OFDM signal at the carrier frequency of the main signal of the delay calculation unit of the quadrature components of the OFDM signals 7 are connected to the corresponding their correction unit inputs the combined quadrature components of the spectrum OFDM signal 8, which are the respective outputs of the device outputs.

The unit for combining the quadrature components of the spectra of OFDM signals 6 shown in FIG. 4, may contain twenty memory registers 9 ₁ -9 ₂₀ having two inputs, the first of which is a data input, and the second is a recording control input and one output, which is a data output, and the data inputs of memory registers 9 ₁ -9 ₆ connected to the corresponding outputs of the quadrature components of the OFDM spectrum of the signal of the corresponding blocks for calculating the quadrature components of the spectrum of the OFDM signal 1 ₁ , 1 ₂ , 1 ₃ , the memory register write control input 9 _{1 is} connected to the corresponding input of the memory register 9 ₂ , the memory registers 9 ₇ -9 ₁₆ and output page both times of arrival of the quadrature components of the OFDM signal of the block computing the quadrature components of the spectrum of the OFDM signal 1 ₁ , the input of the write control of the memory register 9 _{3 is} connected to the corresponding inputs of the memory registers 9 ₄ , 9 ₁₇ , 9 ₁₈ and the output of the strobe of the time of arrival of the quadrature components of the OFDM signal of the block of the quadrature computing a component of the spectrum of the OFDM signal 1 ₂ , the input for controlling the recording of the memory register 9 _{5 is} connected to the corresponding inputs of the memory registers 9 ₆ , 9 ₁₉ , 9 ₂₀ and the output of the time strobe output of the quadrature components of the OFDM signal of the computing unit the quadrature components of the spectrum of the OFDM signal 1 ₃ , the data outputs of the memory registers 9 ₁ and 9 _{2 are} connected to the data inputs of the memory registers 9 ₇ and 9 _8, respectively, the outputs of the data of the memory registers 9 ₃ and 9 _{4 are} connected to the data inputs of the memory registers 9 ₉ and 9 _10, respectively, and also with the inputs of the data of the memory registers 9 ₁₇ and 9 _18, respectively, the outputs of the data of the memory registers 9 ₅ and 9 _{6 are} connected to the inputs of the data of the memory registers 9 ₁₃ and 9 _14, respectively, as well as with the inputs of the data of the memory registers 9 ₁₉ and 9 _20, respectively, the outputs of the data of the memory registers 9 ₁₇ and 9 ₁₈ are connected with the data inputs of the memory registers 9 ₁₁ and 9 _12, respectively, the outputs of the data of the memory registers 9 ₁₉ and 9 _{20 are} connected to the inputs of the data of the memory registers 9 ₁₅ and 9 _16, respectively, and the outputs of the data of the memory registers 9 ₇ , 9 ₉ , 9 ₁₁ , 9, 9 ₁₃ and 9 _{15 are} combined, as are the outputs of the data of the memory registers 9 ₈ , 9 ₁₀ , 9 ₁₂ , 9 ₁₄ and 9 ₁₆ , and are the outputs of the combined quadrature components of the OFDM signal spectra of the block combining the quadrature components of the OFDM signal spectra 6.

The delay calculation unit of the quadrature components of the OFDM signals 7 shown in FIG. 5, may contain two RS flip-flops 10 ₁ and 10 ₂ , a clock generator unit 11, two binary controlled counters 12 ₁ and 12 ₂ and two memory registers 13 ₁ and 13 ₂ , and the RS setup input of flip-flop 10 _{1 is} connected to the corresponding RS-flip-flop input 10 ₂ , reset inputs of binary controlled counters 12 ₁ and 12 ₁ , control inputs for recording memory registers 13 ₁ and 13 ₂ and is connected to the output of the time strobe of the arrival of quadrature components of the OFDM signal of the block for computing quadrature components of the spectrum of the OFDM signal 1 ₁ , reset input of the RS trigger 10 ₁ connected to the output strobe arrival time quadrature component OFDM calculating block signal quadrature component spectrum OFDM signal February _1, a reset input of RS flip-flop 10 ₂ is connected to the output strobe arrival time quadrature component OFDM signal calculation unit quadrature component spectrum OFDM signal 1 is _3, the outputs RS state of flip-flops ₁₀ January and February ₁₀ connected to the resolution enable inputs of the binary controlled counters 12 ₁ and 12 _2, respectively, the clock inputs of the binary controlled counters 12 ₁ and 12 _{2 are} connected to the output of the clock generator 11, the status outputs of the binary controlled counters 12 ₁ and 12 _{2 are} connected to the inputs of the data of the memory registers 13 ₁ and 13 _3, respectively, the outputs of the data of the memory registers 13 ₁ and 13 ₂ are respectively the delay outputs of the quadrature components of the OFDM signal at an adjacent carrier frequency from the upper frequencies from the main signal relative to the arrival time the quadrature OFDM components of the signal at the carrier frequency of the main signal and the delay of the quadrature components of the OFDM signal at the adjacent carrier frequency from the low frequencies from the main signal relative to the time of arrival of the quadrature components t OFDM signal on the carrier frequency of the main signal of the block computing the delay of the quadrature components of the OFDM signals 7.

All the blocks shown in FIG. 1, FIG. 2, FIG. 3, FIG. 4 and FIG. 5 have power inputs that are not shown in FIG. 1, FIG. 2, FIG. 3, FIG. 4 and FIG. 5.

Consider the implementation of the proposed method of processing OFDM signals and the operation of the device implementing it, shown in FIG. 1 - FIG. 5.

, задержки квадратурных компонент OFDM сигнала на соседней несущей частоте со стороны нижних частот от основного сигнала относительно времени прихода квадратурных компонент OFDM сигнала на несущей частоте основного сигнала

и соответствующих этим значениям коэффициентов матрицы коррекции

, равных 1 при m=n и нулю при m≠n в блоке коррекции объединенных квадратурных компонент спектра OFDM сигнала 8, устройство обработки OFDM сигналов начинает свою работу.After applying the supply voltage to all the blocks, loading the programs, according to the algorithms shown in FIG. 6, FIG. 7, FIG. 8, FIG. 9 and FIG. 10, into blocks for correcting the carrier frequency of the quadrature components of the OFDM signal 3, processing of the preamble 4, fast Fourier transform 5 and correction of the combined quadrature components of the spectrum of the OFDM signal 8, as well as setting the initial values of the frequency offset Δƒ _i = 0 in all blocks for correcting the carrier frequency of the quadrature components OFDM signal 3, delays of the quadrature components of the OFDM signal at an adjacent carrier frequency from the high frequencies from the main signal relative to the arrival time of the quadrature components of the OFDM signal at the carrier frequency th signal

, delays of the quadrature components of the OFDM signal at an adjacent carrier frequency from the low frequencies from the main signal relative to the time of arrival of the quadrature components of the OFDM signal at the carrier frequency of the main signal

and corresponding to these values of the coefficients of the correction matrix

equal to 1 for m = n and zero for m ≠ n in the correction block of the combined quadrature components of the spectrum of the OFDM signal 8, the OFDM signal processing device starts its operation.

Signal processing is carried out in two stages:

- the step of calculating the quadrature components of the spectrum of the OFDM signal;

- the stage of correction of quadrature components of the spectrum of the OFDM signal.

и

, получаемые с трехканального радиоприемного устройства

, работающего на трех соседних частотных каналах. Первый канал радиоприемного устройства i=1 работает на несущей частоте основного сигнала, второй канал i=2 - на соседней несущей частоте со стороны верхних частот от основного сигнала, а третий i=3 - на соседней несущей частоте со стороны нижних частот от основного сигнала. Значение z соответствует номеру отсчета квадратурных компонент OFDM сигналов.The initial data for the proposed method of processing OFDM signals and the device that implements it are samples of quadrature components of OFDM signals digitized with a sampling period T _∂

and

received from a three-channel radio receiver

operating on three adjacent frequency channels. The first channel of the radio receiver i = 1 operates at the carrier frequency of the main signal, the second channel i = 2 - at the adjacent carrier frequency from the high frequencies from the main signal, and the third i = 3 - at the neighboring carrier frequency from the low frequencies from the main signal. The value z corresponds to the reference number of the quadrature components of the OFDM signals.

с помощью блоков вычисления квадратурных компонент спектра OFDM сигнала 1₁, 1₂, 1₃.At the stage of calculating the quadrature components of the spectrum of the OFDM signal based on the quadrature components of the OFDM signals received from the receiver, the quadrature components of the spectrum of the OFDM signal are calculated for all channels

using blocks for calculating the quadrature components of the spectrum of the OFDM signal 1 ₁ , 1 ₂ , 1 ₃ .

и

одновременно поступают на соответствующие входы квадратурных компонент OFDM сигнала соответствующих блоков вычисления квадратурных компонент спектра OFDM сигнала 1₁, 1₂, 1₃.Samples of the quadrature components of OFDM signals received from each channel of the radio receiving device

and

simultaneously arrive at the corresponding inputs of the quadrature components of the OFDM signal of the corresponding blocks for calculating the quadrature components of the spectrum of the OFDM signal 1 ₁ , 1 ₂ , 1 ₃ .

Since all the blocks for calculating the quadrature components of the spectrum of the OFDM signal 1 ₁ , 1 ₂ , 1 _{3 are the} same, we consider the operation of only one of them.

The quadrature components of the OFDM signal received at the input of the unit for calculating the quadrature components of the spectrum of the OFDM signal 1 _i may have a carrier frequency offset, which reduces the accuracy of the estimation of the quadrature components of the spectrum of the OFDM signal. To compensate for the carrier frequency offset of the quadrature OFDM signal components, the carrier frequency correction of the quadrature OFDM signal components is performed using the carrier frequency correction block of the quadrature OFDM signal component 3, which operates according to the algorithm shown in FIG. 6.

The specified compensation for a known offset of the carrier frequency of the OFDM signal Δƒ _i can be performed using a linear filter:

и

- отсчеты скорректированных квадратурных компонент OFDM сигнала,

- номер отсчета квадратурных компонент OFDM сигнала на длительности одного OFDM сигнала Т, а K - их количество.Where

and

- readings of the adjusted quadrature components of the OFDM signal,

is the reference number of the quadrature components of the OFDM signal for the duration of one OFDM signal T, and K is their number.

и

образуют вектора

и

при поступлении каждого нового отсчета квадратурных компонент OFDM сигнала z.The obtained samples of the adjusted quadrature components of the OFDM signal

and

form a vector

and

upon receipt of each new sample of quadrature components of the OFDM signal z.

и

выдаются на выходы скорректированных квадратурных компонент OFDM сигнала блока коррекции несущей частоты квадратурных компонент OFDM сигнала 3.Received vectors

and

output to the outputs of the adjusted quadrature OFDM components of the signal of the carrier correction block of the quadrature components of the OFDM signal 3.

To improve the accuracy of determining the offset of the carrier frequency of the OFDM signal, the offset is determined based on the previous offset of the carrier frequency of the quadrature components of the OFDM signal Δƒ _w and the carrier offset of the adjusted quadrature components of the OFDM signal ƒ _is :

Based on the adjusted quadrature OFDM signal components, the OFDM signal preamble is processed to determine the arrival strobe of the quadrature OFDM signal components and the carrier frequency offset of the adjusted quadrature OFDM signal components.

и

поступают на входы скорректированных квадратурных компонент OFDM сигнала блока обработки преамбулы 4, который работает согласно алгоритму, приведенному на фиг. 7.For this vector

and

are fed to the inputs of the adjusted quadrature OFDM components of the signal of the processing block of the preamble 4, which operates according to the algorithm shown in FIG. 7.

The carrier frequency offset value of the adjusted quadrature OFDM signal components ƒ _is necessary to perform the correction of the carrier frequency of the quadrature OFDM signal components is determined by the OFDM signal preamble in the processing block of preamble 4.

The preamble refers to several signals known to the OFDM receiver transmitted before the main information signal and intended to configure the OFDM signal processing apparatus. In addition, each OFDM signal included in both the preamble and the information signal contains a cyclic prefix, which is located at the beginning of the signal and is a copy of the last part of the signal.

If the carrier frequency shift of the corrected quadrature components of the OFDM signal ƒ _is equal to zero, then the cyclic prefix coincides with its copy:

where L is the number of samples of the signal along the length of the cyclic prefix.

In the case of ƒ _is ≠ 0, the phases of the cyclic prefix and the copied part of the signal differ in proportion to the carrier frequency shift of the adjusted quadrature components of the OFDM signal ƒ _is :

where Δϕ _i = 2⋅π (KL) ƒ _is ⋅4T _∂ .

Based on expression (4), the carrier frequency offset of the OFDM signal ƒ _s is defined as:

- квадратурные компоненты функции автокорреляции циклического префикса.Where

- quadrature components of the cyclic prefix autocorrelation function.

и

, то значения модуля квадратурных компонент функции автокорреляции циклического префикса достигнет своего максимального значения, равного энергии циклического префикса E_i=(P_i⋅L⋅Т)/K, где P_i - мощность i-го сигнала. Пользуясь этим свойством можно определить время прихода квадратурных компонент OFDM сигнала τ_i, как:To apply expression (4), it is necessary to know the arrival time of the quadrature components of the OFDM signal τ _i . If the beginning of the cyclic prefix corresponds to the first sample in vectors

and

, then the module values of the quadrature components of the cyclic prefix autocorrelation function will reach its maximum value equal to the energy of the cyclic prefix E _i = (P _i ⋅ L⋅Т) / K, where P _i is the power of the ith signal. Using this property, you can determine the arrival time of the quadrature components of the OFDM signal τ _i as:

и

для каждого вновь поступившего отсчета скорректированных квадратурных компонент OFDM сигнала z. Далее по формуле (6) вычисляется время прихода квадратурных компонент OFDM сигнала. В качестве начального значения при поиске максимума используется значение 0.5⋅E_i, а решение о нахождении максимума принимается, если на длине L/2 нет точек с большим значением модуля функции корреляции.Thus, to determine the values of the strobe outputs of the time of arrival of the quadrature components of the OFDM signal and the carrier frequency offset of the adjusted quadrature components of the OFDM signal, the preamble processing unit 4 calculates the quadrature components of the cyclic prefix autocorrelation function

and

for each newly received sample of the adjusted quadrature components of the OFDM signal z. Then, according to formula (6), the arrival time of the quadrature components of the OFDM signal is calculated. The value 0.5умаE _{i is} used as the initial value when searching for the maximum, and the decision on finding the maximum is made if there are no points with a large value of the correlation function modulus on the L / 2 length.

When this condition is fulfilled, the following signals are output to the outputs of the preamble 4 processing block: a strobe pulse is output to the output time gate of the quadrature OFDM signal components, and the carrier frequency offset of the corrected quadrature OFDM signal components ƒ _is output to the carrier frequency offset signal ƒ _is defined by the formula (5).

The arrival time gate of the quadrature components of the OFDM signal from the output of the processing block of the preamble 4 is supplied to the input of the fast Fourier transform block 5 and is output to the corresponding output of the block computing the quadrature components of the spectrum of the OFDM signal 1 ;.

The resulting carrier frequency offset of the adjusted quadrature OFDM signal components is used in the correction of the carrier frequency of the quadrature OFDM signal components. For this, the value of the carrier frequency offset of the corrected quadrature components of the OFDM signal ƒ _is obtained from the output of the preamble processing block 4 _is supplied to the corresponding input of the carrier frequency correction block of the quadrature components of the OFDM signal 3.

Next, the quadrature components of the spectrum of the OFDM signal are calculated using the fast Fourier transform using the adjusted quadrature components of the OFDM signal and the time strobe of the arrival of the quadrature components of the OFDM signal.

и

с блока коррекции несущей частоты квадратурных компонент OFDM сигнала 3 и строб -времени прихода квадратурных компонент OFDM сигнала с блока обработки преамбулы 4. Блок быстрого преобразования Фурье 5 осуществляет вычисление квадратурных компонент спектра OFDM сигнала, согласно алгоритму, разработанному на базе программы, приведенной в [1] на странице 405. Алгоритм приведен на фиг. 8.To do this, use the fast Fourier transform block 5, the inputs of which are fed the vectors of the corrected quadrature components of the OFDM signal

and

from the carrier frequency correction block of the quadrature components of the OFDM signal 3 and the strobe of the arrival time of the quadrature components of the OFDM signal from the processing unit of the preamble 4. The fast Fourier transform 5 calculates the quadrature components of the spectrum of the OFDM signal according to the algorithm developed on the basis of the program given in [1 ] on page 405. The algorithm is shown in FIG. 8.

и

выдаются на соответствующие выходы блока вычисления квадратурных компонент спектра OFDM сигнала 1_i.The quadrature components of the OFDM signal spectrum obtained in the fast Fourier transform block 5

and

are given to the corresponding outputs of the block for calculating the quadrature components of the spectrum of the OFDM signal 1 _i .

Next, we consider the stage of correction of the quadrature components of the spectrum of the OFDM signal, in which the values of the quadrature components of the spectrum of the OFDM signal at the carrier frequency of the main signal are corrected using the optimal measurement algorithm based on the information on the quadrature components of the spectra of all OFDM signals and their arrival time gates obtained during the calculation of the quadrature an OFDM signal spectrum component for all three carrier frequencies in the quadrature correction block of the OFDM signal spectrum component 2.

The input of the block of correction of the quadrature components of the spectrum of the OFDM signal 2 receives the values of the quadrature components of the spectra of the OFDM signals and the strobes of the time of arrival of the quadrature components of the OFDM signal from all blocks for calculating the quadrature components of the spectrum of the OFDM signal 1 ₁ , 1 ₂ , 1 ₃ .

и

в блоке объединения квадратурных компонент спектров OFDM сигналов 6.Based on the received, on the block of correction of the quadrature components of the spectrum of the OFDM signal 2, the values of the quadrature components of the spectra of the OFDM signals and the strobes of the arrival time of the quadrature components of the OFDM signals, the formation of the combined quadrature components of the spectra of the OFDM signals

and

in the block combining quadrature components of the spectra of OFDM signals 6.

и

, а также

и

проводится для текущих и предыдущих значений квадратурных компонент спектров OFDM сигналов.The main purpose of the unit for combining the quadrature components of the spectra of OFDM signals 6 is to synchronize in time the quadrature components of the spectra of OFDM signals received from all blocks for calculating the quadrature components of the spectrum of the OFDM signal 1 ₁ , 1 ₂ , 1 ₃ . Moreover, the combination of the values of the quadrature components of the spectra of OFDM signals

and

, as well as

and

held for current and previous values of the quadrature components of the spectra of OFDM signals.

и

поступают на входы данных регистров памяти 9₁ и 9₂ соответственно и запоминаются там по стробу времени прихода квадратурных компонент OFDM сигнала на несущей частоте основного сигнала.The values of the quadrature components of the spectrum of the OFDM signal

and

arrive at the data inputs of the memory registers 9 ₁ and 9 _2, respectively, and are stored there by the strobe of the arrival time of the quadrature components of the OFDM signal at the carrier frequency of the main signal.

и

поступают на входы данных регистров памяти 9₃, и 9₄ соответственно, а значения с выходов данных регистров памяти 9₃ и 9₄ поступают на входы данных регистров памяти 9₁₇ и 9₁₈ соответственно. При поступлении строба времени прихода квадратурных компонент OFDM сигнала на соседней несущей частоте со стороны верхних частот от основного сигнала текущие значения квадратурных компонент спектра OFDM сигнала

и

запоминаются в регистрах памяти 9₃ и 9₄, а хранящиеся в них предыдущее значения квадратурных компонент спектра OFDM сигнала

и

перезаписываются в регистры памяти 9₁₇ и 9₁₈.The values of the quadrature components of the spectrum of the OFDM signal

and

arrive at the inputs of the data of the memory registers 9 ₃ and 9 _4, respectively, and the values from the outputs of the data of the memory registers 9 ₃ and 9 ₄ go to the inputs of the data of the memory registers 9 ₁₇ and 9 _18, respectively. When the arrival time gate of the quadrature components of the OFDM signal arrives at an adjacent carrier frequency from the upper frequencies from the main signal, the current values of the quadrature components of the spectrum of the OFDM signal

and

stored in the memory registers 9 ₃ and 9 ₄ , and the previous values of the quadrature components of the spectrum of the OFDM signal stored in them

and

overwritten in memory registers 9 ₁₇ and 9 ₁₈ .

и

поступают на входы данных регистров памяти 9₅ и 9₆ соответственно, а значения с выходов данных регистров памяти 9₅ и 9₆ поступают на входы данных регистров памяти 9₁₉ и 9₂₀ соответственно. При поступлении строба времени прихода квадратурных компонент OFDM сигнала на соседней несущей частоте со стороны нижних частот от основного сигнала текущие значения квадратурных компонент спектра OFDM сигнала

и

запоминаются в регистрах памяти 9₅ и 9₆, а хранящиеся в них предыдущее значения квадратурных компонент спектра OFDM сигнала

и

перезаписываются в регистры памяти 9₁₉ и 9₂₀.The values of the quadrature components of the spectrum of the OFDM signal

and

arrive at the data inputs of the memory registers 9 ₅ and 9 _6, respectively, and the values from the outputs of the data of the memory registers 9 ₅ and 9 ₆ go to the inputs of the data of the memory registers 9 ₁₉ and 9 _20, respectively. Upon receipt of the arrival strobe of the quadrature components of the OFDM signal at an adjacent carrier frequency from the lower frequencies from the main signal, the current values of the quadrature components of the spectrum of the OFDM signal

and

stored in memory registers 9 ₅ and 9 ₆ , and the previous values of the quadrature components of the spectrum of the OFDM signal stored in them

and

overwritten in memory registers 9 ₁₉ and 9 ₂₀ .

и

,

, с выходов данных регистров памяти 9₁, 9₂, 9₃, 9₄, 9₁₇, 9₁₈, 9₅, 9₆, 9₁₉ и 9₂₀ поступают на входы данных регистров памяти 9₇-9₁₆ соответственно и сохраняются там по стробу времени прихода квадратурных компонент OFDM сигнала на несущей частоте основного сигнала.Further, all the obtained values of the quadrature components of the spectra of OFDM signals

and

,

, from the outputs of the data of the memory registers 9 ₁ , 9 ₂ , 9 ₃ , 9 ₄ , 9 ₁₇ , 9 ₁₈ , 9 ₅ , 9 ₆ , 9 ₁₉ and 9 _{20 they} go to the inputs of the data of the memory registers 9 ₇ -9 ₁₆ respectively and are stored there by the arrival time gate of the quadrature OFDM signal components at the carrier frequency of the main signal.

, а на выходах регистров памяти 9₈, 9₁₀, 9₁₂, 9₁₄, 9₁₆, формируется и сохраняется на период поступления OFDM сигналов вектор

, которые образуют выходы объединенных квадратурных компонент спектров OFDM сигналов.Thus, at the outputs of the memory registers 9 ₇ , 9 ₉ , 9 ₁₁ , 9 ₁₃ , 9 ₁₅ , a vector is formed and stored for the period of arrival of OFDM signals

and, at the outputs of the memory registers 9 ₈ , 9 ₁₀ , 9 ₁₂ , 9 ₁₄ , 9 ₁₆ , a vector is formed and stored for the period of arrival of OFDM signals

which form the outputs of the combined quadrature components of the spectra of OFDM signals.

At the same time, based on the values of the arrival gates of the time of arrival of the quadrature components of the OFDM signals received on the correction block of the quadrature components of the spectrum of the OFDM signal 2, the delays of the quadrature components of the OFDM signals in the block for calculating the delays of the quadrature components of the OFDM signals 7 are calculated.

In the block for calculating the delays of the quadrature components of the OFDM signal 7, the delay of the quadrature components of the OFDM signal at an adjacent carrier frequency from the main signal from the main signal relative to the time of arrival of the quadrature components of the OFDM signal at the carrier frequency of the main signal Δτ ₂ and the delay of the quadrature components of the OFDM signal at the adjacent carrier frequency are determined from the low frequencies from the main signal relative to the arrival time of the quadrature components of the OFDM signal at the carrier frequency of the main signal Δτ ₃ .

To do this, the arrival time strobe of the quadrature OFDM signal components at the carrier frequency of the main signal is supplied to the RS installation inputs of triggers 10 ₁ and 10 ₂ , the arrival time strobe of the quadrature OFDM components of the signal at the adjacent carrier frequency from the upper frequencies from the main signal is fed to the RS input of the trigger 10 ₁ , and the strobe of the arrival time of the quadrature components of the OFDM signal at an adjacent carrier frequency from the low frequencies from the main signal is fed to the reset input RS of trigger 10 ₂ . As a result, a pulse is generated at the RS state output of trigger 10 ₁ , the duration of which is equal to the delay of the quadrature components of the OFDM signal at an adjacent carrier frequency from the upper frequencies from the main signal relative to the arrival time of the quadrature components of the OFDM signal at the carrier frequency of the main signal Δτ ₃ , and at the state output RS trigger 10 ₂ a pulse is formed, the duration of which is equal to the delay of the quadrature components of the OFDM signal at an adjacent carrier frequency from the low frequencies from the main signal as a function of the arrival time of the quadrature components of the OFDM signal at the carrier frequency of the main signal Δτ ₃ , which are supplied to the counting resolution inputs of binary controlled counters 12 ₁ and 12 _2, respectively.

The reset inputs of the binary controlled counters 12 ₁ and 12 ₂ receive a strobe of the arrival time of the quadrature components of the OFDM signal at the carrier frequency of the main signal, which ensures the resetting of the state of the counters before counting the delay times.

The clock inputs of the binary controlled counters 12 ₁ and 12 ₂ receive clock pulses from the block of the clock generator 11.

Thus, the binary controlled counter 12 ₁ counts the pulses received from the clock unit 11, from the moment of arrival of the time gate of the quadrature OFDM components arriving at the carrier frequency of the main signal until the arrival of the time strobe of the arrival of the quadrature OFDM signal components at the adjacent carrier frequency from the side upper frequencies of the main signal, and a binary counter driven February ₁₂ conducts count pulses coming from the clock generator block 11 upon receipt strobe arrival time vadraturnyh OFDM signal components at the carrier frequency of the main signal prior to the arrival of the strobe time of arrival of the quadrature components OFDM signal on an adjacent carrier frequency from the low frequency of the main signal.

Obtained from the output of the state of the binary controlled counter 12 ₁ , the delay value of the quadrature components of the OFDM signal at an adjacent carrier frequency from the upper frequency side from the main signal relative to the time of arrival of the quadrature components of the OFDM signal at the carrier frequency of the main signal Δτ ₂ is input to the data of the memory register 13 ₁ , and obtained from the output state of the binary counter ₁₂ February managed delay value OFDM quadrature component on an adjacent carrier frequency signal from the low pass from the main signal on in relative time of arrival of the quadrature OFDM signal components at the carrier frequency Δτ ₃ main signal is input to the memory data register on February ₁₃ and stored therein for admission strobe arrival time quadrature component OFDM carrier signal of the main signal.

The values of the delay of the quadrature components of the OFDM signal at an adjacent carrier frequency from the main signal from the main signal relative to the time of arrival of the quadrature components of the OFDM signal at the carrier frequency of the main signal Δτ ₂ and the delays of the quadrature components of the OFDM signal at the adjacent carrier frequency stored in the memory registers 13 ₁ and 13 ₂ from the low frequencies from the main signal relative to the arrival time of the quadrature components of the OFDM signal at the carrier frequency of the main signal Δτ ₃ are fed to the corresponding inputs of the block the refraction of the combined quadrature components of the spectrum of the OFDM signal 8, which operates according to the algorithm shown in FIG. 9.

The correction process of the combined quadrature components of the spectra of the OFDM signals in the correction block of the combined quadrature components of the spectrum of the OFDM signal 8 includes the following procedures:

на основе поступивших на входы блока коррекции объединенных квадратурных компонент спектра OFDM сигнала 8 значений задержки квадратурных компонент OFDM сигнала на соседней несущей частоте со стороны верхних частот от основного сигнала относительно времени прихода квадратурных компонент OFDM сигнала на несущей частоте основного сигнала Δτ₂ и задержки квадратурных компонент OFDM сигнала на соседней несущей частоте со стороны нижних частот от основного сигнала относительно времени прихода квадратурных компонент OFDM сигнала на несущей частоте основного сигнала Δτ₃, а также заложенной при программировании устройства обработки OFDM сигналов информации о несущих частотах ƒ_i и количестве поднесущих Ns OFDM сигналов;1. Calculation of the cross-correlation matrix

based on the input of the correction block of the combined quadrature components of the spectrum of the OFDM signal, 8 delay values of the quadrature components of the OFDM signal at an adjacent carrier frequency from the upper frequency side of the main signal relative to the time of arrival of the quadrature components of the OFDM signal at the carrier frequency of the main signal Δτ ₂ and the delay of the quadrature OFDM components the signal at the adjacent carrier frequency from the low frequencies from the main signal relative to the arrival time of the quadrature components of the OFDM signal at the carrier frequency the main signal Δτ ₃ , as well as information on the carrier frequencies ƒ _i and the number of subcarriers Ns OFDM signals embedded in the programming of the OFDM signal processing device;

[2];2. Perform regularization of the cross-correlation matrix

[2];

, путем обращения полученной после регуляризации матрицы;3. The calculation of the matrix

by reversing the matrix obtained after regularization;

;4. Calculation of the correction matrix

;

5. Calculation of the corrected quadrature components of the spectrum of the OFDM signal by multiplying the combined quadrature components of the spectra of the OFDM signals by the correction matrix.

и

, для которых коэффициенты матрицы коррекции

были уже определены.The first four stages are carried out only when the delay values of the quadrature components of the OFDM signal at the adjacent carrier frequency from the main signal from the main signal are changed relative to the time of arrival of the quadrature components of the OFDM signal at the carrier frequency of the main signal Δτ ₂ or the delay of the quadrature components of the OFDM signal at the adjacent carrier frequency from the side low frequencies from the main signal relative to the arrival time of the quadrature components of the OFDM signal at the carrier frequency of the main signal Δτ ₃ . Therefore, the Δτ ₂ and Δτ ₃ values received at the correction block of the combined quadrature components of the spectrum of the OFDM signal 8 are compared with the values stored in the correction block of the combined quadrature components of the spectrum of the OFDM signal 8

and

for which the coefficients of the correction matrix

have already been identified.

и

, то коэффициенты матрицы коррекции

не изменяются и блок коррекции объединенных квадратурных компонент спектра OFDM сигнала 8 выполняет только пятую процедуру вычисления скорректированных квадратурных компонент спектра OFDM сигнала путем умножения объединенных квадратурных компонент спектров OFDM сигналов

и

на матрицу коррекции

.If the values

and

, then the coefficients of the correction matrix

are not changed and the correction unit of the combined quadrature components of the spectrum of the OFDM signal 8 performs only the fifth procedure for calculating the adjusted quadrature components of the spectrum of the OFDM signal by multiplying the combined quadrature components of the spectra of OFDM signals

and

to the correction matrix

.

или

, то коэффициенты матрицы коррекции

изменяются и блок коррекции объединенных квадратурных компонент спектра OFDM сигнала 8 выполняет все указные процедуры (1-5).If the values

or

, then the coefficients of the correction matrix

are changed and the correction unit of the combined quadrature components of the spectrum of the OFDM signal 8 performs all the indicated procedures (1-5).

имеет вид:Cross correlation matrix

has the form:

where N = 5⋅Ns is the number of estimated signal values, one signal on each of the Ns OFDM subcarriers of the signal at the carrier frequency of the main signal and two signals corresponding to the current and previous values of the quadrature components on each of the Ns OFDM subcarriers of signals on adjacent carriers frequencies from the upper and lower frequencies from the main signal.

определяются на длительности Т как:The values of the coefficients of the cross correlation matrix

are determined for the duration T as:

- разность частот поднесущих

сигналов;Where

- subcarrier frequency difference

signals;

[x] is the designation of the integer part of the number x;

{x} - designation of the fractional part of the number x;

- интервал времени одновременного присутствия сигналов

и

, которые выбираются из следующих условий:

- time interval of the simultaneous presence of signals

and

which are selected from the following conditions:

и

интервал равняется (0,T);1. For the current values of the quadrature components of the subcarriers of the first OFDM signal

and

the interval is (0, T);

и

интервал равняется (Δτ₂,T);2. For previous values of the quadrature components of the subcarriers of the second OFDM signal

and

the interval is (Δτ ₂ , T);

и

интервал равняется (0,Δτ₂);3. For the current values of the quadrature components of the subcarriers of the second OFDM signal

and

the interval is (0, Δτ ₂ );

и

интервал равняется (Δτ₃,Т);4. For previous values of the quadrature components of the subcarriers of the third OFDM signal

and

the interval is equal (Δτ ₃ , T);

интервал равняется (0,Δτ₃);5. For the current values of the quadrature components of the subcarriers of the third OFDM signal and

the interval is (0, Δτ ₃ );

и

,

и

интервал времени также равняется (Δτ₂,T);6. For combined cases

and

,

and

the time interval is also equal to (Δτ ₂ , T);

и

,

и

интервал времени также равняется (0,Δτ₂);7. For combined cases

and

,

and

the time interval is also equal to (0, Δτ ₂ );

и

,

и

интервал времени также равняется (Δτ₃,Т);8. For combined cases

and

,

and

the time interval is also equal (Δτ ₃ , T);

и

,

и

интервал времени также равняется (0,Δτ₃);9. For combined cases

and

,

and

the time interval is also equal to (0, Δτ ₃ );

и

,

и

интервал времени равняется (Δτ₂,Δτ₂);10. For combined cases

and

,

and

the time interval is (Δτ ₂ , Δτ ₂ );

и

,

и

интервал времени равняется (max(Δτ₂,Δτ₃),Т);11. For combined cases

and

,

and

the time interval is equal to (max (Δτ ₂ , Δτ ₃ ), T);

и

,

и

интервал времени равняется

12. For combined cases

and

,

and

time interval equals

и

,

и

интервал времени равняется

13. For combined cases

and

,

and

time interval equals

и

,

и

интервал времени равняется (0,min(Δτ₂,Δτ₃));14. For combined cases

and

,

and

the time interval is (0, min (Δτ ₂ , Δτ ₃ ));

и

,

и

интервал времени равняется (Δτ₃,Δτ₃).15. For combined cases

and

,

and

the time interval is (Δτ ₃ , Δτ ₃ ).

, согласно формуле (8), соответствует блок вычисление

».In the operation algorithm of the correction unit for the combined quadrature components of the spectrum of the OFDM signal 8 shown in FIG. 9, the operation of calculating the coefficients of the cross-correlation matrix

, according to the formula (8), corresponds to the block calculation

".

. Для этого элементы матрицы

, находящиеся на главной диагонали умножаются на величину 1.001, которая была определена методом численного анализа.To reduce the influence of accuracy of calculations during the inversion of a high-dimensional matrix, the regularization procedure of the cross-correlation matrix is performed

. For this, matrix elements

located on the main diagonal are multiplied by the value 1.001, which was determined by numerical analysis.

Then, the obtained matrix is inverted using the Gauss-Jordan method as one of the least computational complexity [3]. The algorithm of the inversion procedure is shown in FIG. 10.

Since the values of the quadrature components of the spectra of the OFDM signals obtained from the blocks for calculating the quadrature components of the spectrum of the spectra of the OFDM signal 1 ₂ and 1 _{3 were} determined based on the readings of the quadrature components of the OFDM signals received at the input of the device, including outside the interval of duration T, the indicated obtained values are necessary to adjust.

Samples of the quadrature components of OFDM signals at adjacent carrier frequencies from the upper and lower frequencies from the main signal falling into an interval of duration T can be obtained from the original quadrature components of OFDM signals by multiplying them by rectangular pulses of duration Δτ ₂ and Δτ _3, respectively.

Therefore, the quadrature components of the spectra of OFDM signals at adjacent carrier frequencies from the upper and lower frequencies from the main signal, corresponding to samples of the quadrature components of OFDM signals falling in the interval of duration T, are the convolution of the original quadrature components of the spectra of OFDM signals with quadrature components of the spectra of rectangular pulses of duration Δτ ₂ and Δτ _3, respectively.

, с коэффициентами вида:The specified operation is carried out using a matrix

, with coefficients of the form:

Where

согласно формуле (9), соответствует блок «вычисление

».In the operation algorithm of the correction unit of the combined quadrature components of the OFDM spectrum of sinal 8, shown in Fig.9, the operation of calculating the matrix coefficients

according to the formula (9), corresponds to the block “calculation

".

одинаковые и они зависят от дних и тех же параметров, то для снижения вычислительных затрат расчет их коэффициентов проводят параллельно в одном цикле.Since the dimensions of the matrices

are the same and they depend on the same parameters, then in order to reduce computational costs, their coefficients are calculated in parallel in one cycle.

и

- вычисляются коэффициенты матрицы коррекции

:Further, based on the obtained coefficients of the inverse matrix

and

- the coefficients of the correction matrix are calculated

:

Where

значения Δτ₂ и Δτ₃, полученные с блока вычисления задержек квадратурных компонент OFDM сигналов 7 сохраняются в переменных

и

соответственно.After determining the coefficients of the correction matrix

the values Δτ ₂ and Δτ ₃ obtained from the block for calculating the delays of the quadrature components of the OFDM signals 7 are stored in variables

and

respectively.

The procedure for calculating the corrected quadrature components of the spectrum of the OFDM signal is performed by multiplying the combined quadrature components of the spectra of the OFDM signals by the correction matrix

,

,

и

-

-е отсчеты скорректированных квадратурных компонент спектра OFDM сигнала

и

соответственно, являющиеся выходными данными устройства обработки OFDM сигналов, a

и

-

-е отсчеты объединенных квадратурных компонент спектров OFDM сигналов

и

соответственно, поступающих с блока объединения квадратурных компонент спектров OFDM сигналов 6.Where

,

,

and

-

the corrected quadrature components of the spectrum of the OFDM signal

and

respectively, being the output of an OFDM signal processing apparatus, a

and

-

Samples of the combined quadrature components of the spectra of OFDM signals

and

respectively, coming from the block combining the quadrature components of the spectra of OFDM signals 6.

The blocks shown in FIG. 4 and FIG. 5, have a standard implementation and published in the literature. The carrier frequency correction blocks of the quadrature components of the OFDM signal 3, processing of the preamble 4, fast Fourier transform 5, shown in FIG. 2 and the correction block of the combined quadrature components of the spectrum of the OFDM signal 8 shown in FIG. 3 can be implemented on the basis of digital signal processors 1892 VM10YA [4] when loading programs into them, according to the algorithms shown in FIG. 6, FIG. 7, FIG. 8, FIG. 9 and FIG. 10, respectively.

Moreover, the ports MFBSPO, MFBSP1 and MFBSP2, MFBSP3, respectively, are used as inputs and outputs of the quadrature components of OFDM signals and the quadrature components of the spectra of OFDM signals.

As an input of the carrier frequency offset of the corrected quadrature components of the OFDM signal of the block of correction of the carrier frequency of the quadrature components of the OFDM signal 3, outputs of the time strobe of the arrival of the quadrature components of the OFDM signal and a shift of the carrier frequency of the adjusted quadrature components of the OFDM signal of the processing block of preamble 4, the input of the strobe of the time of arrival of the quadrature OFDM components signal of the fast Fourier transform block 5 and the delay inputs of the quadrature components of the OFDM signal at an adjacent carrier frequency from the upper parts t from the main signal relative to the time of arrival of the quadrature components of the OFDM signal at the carrier frequency of the main signal and the delay of the quadrature components of the OFDM signal at the adjacent carrier frequency from the lower frequencies from the main signal relative to the time of arrival of the quadrature components of the OFDM signal at the carrier frequency of the main signal of the correction block of the combined quadrature components OFDM signal spectrum 8 uses USART ports.

The technical result in the proposed method of processing OFDM signals and a device for its implementation, which consists in increasing the reliability of communication by reducing the influence of intra-system interference, which provides a reduction in the variance of the estimates of the quadrature components of the spectrum of the OFDM signal transmitted at the carrier frequency of the main signal, is achieved by correcting these quadrature components of the spectrum of the OFDM signal based on the optimal measurement algorithm for the joint processing of the spectra of OFDM signals present at three carrier frequencies ah (main and adjacent from the upper and lower frequencies).

Information sources

1. Rabiner L., Gould B. Theory and application of digital signal processing. - M .: Mir, 1978.- 848 p.

2. Tikhonov A.N., Arsenin V.Ya. Methods for solving incorrect tasks. - M .: Science. The main edition of the physical and mathematical literature, 1979. Ed. 2nd-285 s

3. William H. Press, Saul A. Teukolsky, William T. Vetterling, Brian P. Flannery. Numerical Recipes: The Art of Scientific Computing. 2007.

4. Integrated circuit 1892 VM10YA. User's manual. http://multicore.ru/mc/data_sheets/Manual_1892VM10YA_141015.pdf

Claims (5)

1. The method of processing OFDM signals, namely, that at the stage of calculating the quadrature components of the spectrum of the OFDM signal, the carrier frequency of the quadrature components of the OFDM signal is first corrected, based on the adjusted quadrature components of the OFDM signal, the OFDM signal is processed for determining the strobe, time of arrival of the quadrature components OFDM signal and carrier frequency offset of the adjusted quadrature components of the OFDM signal, the resulting carrier frequency offset of the adjusted quadrature components the OFDM signal is used to correct the carrier frequency of the quadrature OFDM signal components, then the quadrature components of the OFDM signal spectrum are calculated using the fast Fourier transform using the adjusted quadrature OFDM signal components and the arrival time strobe of the quadrature OFDM signal components, characterized in that said step of calculating the quadrature components of the spectrum of the OFDM signal is also performed for adjacent carrier frequencies from the upper and lower frequencies from the main signal, and the correction step is also introduced the quadrature components of the spectrum of the OFDM signal, on which the values of the quadrature components of the spectrum of the OFDM signal at the carrier frequency of the main signal are corrected using the optimal measurement algorithm based on the information on the quadrature components of the spectra of all OFDM signals and the arrival time gates obtained during the calculation of the quadrature components of the OFDM spectrum signal, for all three carrier frequencies. 2. An OFDM signal processing device comprising a block for calculating the quadrature components of the OFDM signal spectrum, having two inputs of the quadrature OFDM signal components, which are simultaneously inputs of the device for the quadrature OFDM signal components at the carrier frequency of the main signal, and three outputs, the first two of which are outputs the quadrature components of the spectrum of the OFDM signal, and the third output is the output of the time strobe of the arrival of the quadrature components of the OFDM signal, and the block for calculating the quadrature components of the spectrum of the OFDM signal contains to the correction of the carrier frequency of the quadrature components of the OFDM signal, having three inputs and two outputs, the first two inputs of which are inputs of the quadrature components of the OFDM signal, the third input of which is the input of the carrier frequency offset of the adjusted quadrature components of the OFDM signal, and both outputs are outputs of the adjusted quadrature components OFDM signal, a preamble processing unit having two inputs and two outputs, the inputs of which are inputs of the adjusted quadrature components of the OFDM signal, the first output is This is the output of the arrival time gate of the quadrature components of the OFDM signal, and the second output is the carrier frequency shift output of the corrected quadrature components of the OFDM signal, and the fast Fourier transform unit has three inputs and two outputs, the first two inputs of which are inputs of the corrected quadrature components of the OFDM signal, the third input of which is the input of the time strobe of the arrival of the quadrature components of the OFDM signal, and both outputs of which are outputs of the quadrature components of the spectrum of the OFDM signal, and the inputs of the quadrature OFDM components of the signal of the carrier frequency correction block of the quadrature OFDM signal components are the inputs of the block of calculating the quadrature components of the OFDM signal spectrum, and the carrier frequency shift input of the adjusted quadrature OFDM signal of the carrier frequency correction block of the quadrature OFDM signal component is connected to the corresponding output of the preamble processing unit, the outputs of the corrected quadrature OFDM components of a signal of a carrier frequency correction block quadrature components of an OFDM signal are connected to by the inputs of the preamble processing unit and the fast Fourier transform block, the output time gate of the quadrature OFDM components of the signal of the preamble processing block is connected to the corresponding input of the fast Fourier transform block and is the output of the quadrature component of the OFDM spectrum, and the outputs of the quadrature OFDM spectrum components of the fast block Fourier transforms are the outputs of the block for calculating the quadrature components of the spectrum of the OFDM signal, characterized in that it contains two more such a block for calculating the quadrature components of the spectrum of the OFDM signal, the inputs of the second block for calculating the quadrature components of the spectrum of the OFDM signal are inputs of the device for the quadrature components of the OFDM signal at the adjacent carrier frequency from the main signal, and the inputs of the third block for calculating the quadrature components of the spectrum of the OFDM signal are inputs devices for the quadrature components of the OFDM signal at an adjacent carrier frequency from the low frequencies from the main signal, and the block quadrature component correction an element of the spectrum of the OFDM signal, which has three groups of inputs for each of the carrier frequencies, three inputs in each group, the first two of which are inputs of the quadrature components of the spectrum of the OFDM signal, and the third input is the input of the time strobe input of the quadrature components of the OFDM signal at the corresponding carrier frequency and two outputs that are outputs of the adjusted quadrature components of the spectrum of the OFDM signal at the carrier frequency of the main signal, the inputs of each of the groups of the block of quadrature components of the spectrum of the OFDM signal being connected to the corresponding outputs of the corresponding blocks for calculating the quadrature components of the spectrum of the OFDM signal, and the outputs of the block for correcting the quadrature components of the spectrum of the OFDM signal are the corresponding outputs of the device. 3. An OFDM signal processing device according to claim 2, characterized in that the block of quadrature component correction of the OFDM signal spectrum comprises a block for combining the quadrature component of the OFDM signal spectra, a block for calculating the delay of the quadrature components of the OFDM signals and a correction block for the combined quadrature components of the OFDM signal spectrum, the first two inputs, which are the inputs of the quadrature components of the spectrum of the OFDM signal of each of the three groups of the block combining the quadrature components of the spectra of OFDM signals, are intended to be connected to the corresponding the corresponding outputs of the blocks of calculating the quadrature components of the spectrum of the OFDM signal, and the third inputs, which are inputs of the time strobe of the arrival of the quadrature components of the OFDM signal of each group, are connected to the corresponding inputs of the block for calculating the delay of the quadrature components of the OFDM signals and are designed to connect to the corresponding outputs of the corresponding blocks of calculating the quadrature OFDM signal spectrum component, the outputs of the block combining the quadrature component of the OFDM signal spectra are connected to the corresponding by the moves of the combined quadrature components of the OFDM spectra of the signal of the correction block of the combined quadrature components of the spectrum of the OFDM signal, the delay outputs of the quadrature components of the OFDM signal at the adjacent carrier frequency from the main signal from the main signal relative to the time of arrival of the quadrature components of the OFDM signal at the carrier frequency of the main signal and the delay of the quadrature OFDM components the signal at an adjacent carrier frequency from the low frequencies from the main signal relative to the time of arrival of the quadrature OFD components The M signal at the carrier frequency of the main signal of the block for calculating the delay of the quadrature components of the OFDM signals is connected to the corresponding inputs of the correction block of the combined quadrature components of the spectrum of the OFDM signal, the outputs of which are the corresponding outputs of the device. 4. The OFDM signal processing device according to claim 3, characterized in that the unit for combining the quadrature components of the spectra of OFDM signals contains twenty memory registers having two inputs, the first of which is a data input, and the second is a recording control input, and one each the output, which is the output of the data, and the inputs of the data of the memory registers from the first to the sixth are designed to connect to the corresponding outputs of the quadrature components of the spectrum of the OFDM signal of the corresponding blocks for computing quadrature components of the spectrum of the OFDM signal la, the recording control input of the first memory register is connected to the corresponding input of the second memory register, the seventh to sixteenth memory registers and is designed to connect to the output of the time of arrival of the quadrature components of the OFDM signal of the first block for calculating the quadrature components of the spectrum of the OFDM signal, the inputs of which are intended for the receipt of quadrature OFDM signal component on the carrier frequency of the main signal, the recording control input of the third memory register is connected to the corresponding inputs of the fourth, with the seventeenth and eighteenth memory registers and is designed to connect to the output of the arrival time gate of the quadrature OFDM signal components of the second block of calculation of the quadrature components of the OFDM signal spectrum, the inputs of which are designed to receive the quadrature OFDM signal components at the adjacent carrier frequency from the upper frequencies from the main signal, control input recording the fifth memory register is connected to the corresponding inputs of the sixth, nineteenth and twentieth memory registers and is designed to connect to the output of the time strobe of the arrival of the quadrature OFDM components of the signal of the third block of the calculation of the quadrature components of the spectrum of the OFDM signal, the inputs of which are intended for the receipt of the quadrature components of the OFDM signal at an adjacent carrier frequency from the low frequencies from the main signal, the data outputs of the first and second memory registers are connected to the seventh data inputs and the eighth memory registers, respectively, the data outputs of the third and fourth memory registers are connected to the data inputs of the ninth and tenth memory registers with respectively, and also with the data inputs of the seventeenth and eighteenth memory registers, respectively, the data outputs of the fifth and sixth memory registers are connected to the data inputs of the thirteenth and fourteenth memory registers, respectively, as well as with the data inputs of the nineteenth and twentieth memory registers, respectively, the data outputs of the seventeenth and eighteenth registers memory are connected to the data inputs of the eleventh and twelfth memory registers, respectively, the data outputs of the nineteenth and twentieth memory registers connected to the data inputs of the fifteenth and sixteenth memory registers, respectively, and the data outputs of the seventh, ninth, eleventh, thirteenth and fifteenth memory registers are combined, like the data outputs of the eighth, tenth, twelfth, fourteenth and sixteenth memory registers, and are outputs of the combined quadrature components of the spectra of the spectra OFDM signals of a block combining quadrature components of the spectra of OFDM signals. 5. The OFDM signal processing device according to claim 3, characterized in that the delay computing unit of the quadrature components of the OFDM signals comprises two RS triggers, a clock generator, two binary controlled counters and two memory registers, the installation input of the first RS trigger being connected to the corresponding input the second RS trigger, the reset inputs of both binary controlled counters, the recording control inputs of both memory registers and is designed to connect to the output of the time strobe of the arrival of the quadrature components of the OFDM signal of the first block to calculate the quadrature components of the spectrum of the OFDM signal, the inputs of which are intended to receive the quadrature components of the OFDM signal at the carrier frequency of the main signal, the reset input of the first RS trigger is used to connect the second time block of the calculation of the quadrature components of the spectrum of the OFDM signal to the output of the quadrature component of the OFDM signal, inputs which are intended for the arrival of the quadrature components of the OFDM signal at an adjacent carrier frequency from the high frequencies from the main signal, and the input is reset the second RS trigger is designed to connect to the output of the arrival time gate of the quadrature OFDM signal components of the third block of calculating the quadrature components of the OFDM signal spectrum, the inputs of which are intended to receive the quadrature OFDM signal components at the adjacent carrier frequency from the low frequency side of the main signal, status outputs of both RS triggers connected to the resolution enable inputs of the binary controlled counters respectively, the clock inputs of both binary controlled counters are connected to the clock output of the second generator, the status outputs of both binary controlled counters are connected to the data inputs of the memory registers, respectively, the data outputs of both memory registers are respectively the delay outputs of the quadrature OFDM signal components on the adjacent carrier frequency from the high frequency side from the main signal relative to the arrival time of the quadrature OFDM signal components on the carrier the frequency of the main signal and the delay of the quadrature components of the OFDM signal at an adjacent carrier frequency from the low frequencies from the main signal with respect to the arrival time of the quadrature components of the OFDM signal at the carrier frequency of the main signal of the block for calculating the delays of the quadrature components of the OFDM signals.

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