KR20080090706A - Signal transmitting and receiving method and signal transmitting and receiving device - Google Patents

Abstract

The present invention relates to a method for transmitting and receiving a signal and an apparatus for transmitting and receiving a signal, wherein the method for transmitting and receiving a signal according to the present invention selects and outputs data farther than a coherence time among symbol data mapped according to a corresponding transmission scheme. The method includes the steps of: coding and outputting the selected symbol data to be distributed over at least two symbol data in a time domain, and performing multiple input / output encoding so that the coded data can be transmitted in multiple times.

Therefore, according to the present invention, the input data is distributed and transmitted in the time domain, thereby making it robust to the time selective fading of each transmission channel and increasing the signal reception performance of the receiver.

Description

Method for signal transmitting and apparatus for the same, Method for signal receiving and apparatus for the same

1 is a block diagram schematically showing an apparatus for transmitting a signal as an embodiment according to the present invention;

2 is a block diagram schematically showing a linear precoding unit according to an embodiment of the present invention.

3 (a) is a diagram illustrating a matrix of codes for distributing input data according to an embodiment of the present invention.

3 (b) is a diagram illustrating another code matrix for distributing input data according to an embodiment of the present invention.

4 is a block diagram schematically illustrating a case in which a signal transmission apparatus has a plurality of transmission paths according to an embodiment of the present invention.

5A to 5E illustrate an example of a 2 × 2 code matrix for distributing input symbols according to an embodiment of the present invention.

6 is a block diagram schematically illustrating an apparatus for receiving a signal according to an embodiment of the present invention.

7 (a) is a block diagram schematically showing an example of a linear precoding decoder as an embodiment according to the present invention.

7 (b) is a block diagram schematically illustrating another example of a linear precoding decoder according to an embodiment of the present invention.

8 is a block diagram schematically illustrating a case in which a signal receiving apparatus has a plurality of receiving paths according to an embodiment of the present invention.

9 (a) to 9 (e) illustrate an example of a 2 × 2 code matrix for reconstructing distributed symbols as an embodiment according to the present invention.

10 is a flowchart illustrating a signal transmission / reception method according to an embodiment of the present invention.

* Explanation of symbols for the main parts of the drawings

100: outer coder 110: outer interleaver

120: inner coder 130: inner interleaver

140: symbol mapper 150: block selection unit

160: linear precoding unit 170: multiple input and output encoder

180: frame forming unit 190: SC modulator

195: transmission unit

The present invention relates to a signal transmission and reception method and a signal transmission and reception apparatus, and more particularly, to a signal transmission and reception method and a transmission and reception apparatus that is robust to time selective fading.

As technology advances, the size of data desired by a user is gradually increasing, but there is a certain limit to the expansion of a transmission resource for transmitting the data to the user. Therefore, various techniques have been developed to improve the transmission efficiency of data using finite transmission resources.

Among the above techniques, there is a multiple input / output (MIMO: Multi Input Multi Output) scheme in which a plurality of transmission / reception antennas are used to increase data transmission efficiency.

The transmission / reception system using a single carrier (SC) has a peak-to-average power ratio in the time domain compared to a system using multiple carriers such as orthogonal frequency division multiplexing (OFDM). Since the ratio (PAPR) is low, it is efficient in terms of transmission power.

However, in a transmission channel that suffers from the Doppler effect, time selective fading occurs in the time domain, and size distortion in the time domain becomes very severe according to the moving speed of the receiver. Therefore, the signal-to-noise ratio (SNR) for each time domain is changed, and the reception rate is reduced in the time domain where the SNR is very low.

In the case of using the multiple input / output scheme, the array gain can be obtained by using multiple antennas to improve the average SNR, and the fading of the transmission channel from each transmitting antenna to each receiving antenna is independent. Diversity gain can be obtained.

However, in the case of the multi-input / output method, when only one specific transmission channel is considered, there is a problem that it is still forced to undergo time-selective fading.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object thereof is to provide a signal transmission and reception method and a transmission and reception apparatus that are robust against time selective fading.

According to an aspect of the present invention, there is provided a signal transmission apparatus comprising: a symbol mapper for mapping input data to symbol data according to a corresponding transmission scheme, and data farther from a coherence time in the symbol data; A block selector for selecting and outputting a signal, a precoding unit for coding and outputting the selected symbol data to be distributed over at least two symbol data in a time domain, and a multiple input / output encoder for encoding the precoded data to be transmitted in multiplexes It includes.

In the signal transmission method according to the present invention, selecting and outputting data farther than a coherence time among symbol data mapped according to a corresponding transmission method, and outputting the selected symbol data to at least two symbols in a time domain Coding and outputting the data to be distributed to the data, and performing multiple input / output encoding so that the coded data can be transmitted in multiplex.

In accordance with another aspect of the present invention, a signal receiving apparatus includes: a multiple input / output decoder for decoding a plurality of received data and outputting one symbol data string, and a precoding for restoring and outputting data distributed in a time domain from the output symbol data string A decoder, a block reconstruction unit for returning the recovered symbol data to an original position farther than a coherence time, and a symbol demapper for demapping the symbol data returned to the original position and outputting bit data corresponding to the symbol do.

The signal receiving method according to the present invention comprises the steps of: outputting a single symbol data string by multiple input / output decoding of multiplely received data, decoding the output symbol data, restoring data distributed in a time domain; Returning the recovered symbol data to an original position farther than a coherence time, and demapping the returned symbol data.

Other objects, features and advantages of the present invention will become apparent from the following detailed description of embodiments taken in conjunction with the accompanying drawings.

In addition, the terms used in the present invention was selected as a general term widely used as possible now, but in certain cases, the term is arbitrarily selected by the applicant, in which case the meaning is described in detail in the corresponding description of the invention, It is to be clear that the present invention is to be understood as the meaning of terms rather than names.

Operation of the signal transmission and reception method and the signal transmission and reception device according to the present invention configured as described above will be described in detail with reference to the accompanying drawings.

1 is a block diagram schematically showing a signal transmission apparatus according to an embodiment according to the present invention. The transmission and reception system uses MIMO (Multi Input Multi Output) for multiple input and output.

The signal transmission apparatus of FIG. 1 transmits a signal using a single carrier (SC). When the signal transmission apparatus transmits video data such as a broadcast signal, the apparatus may be a broadcast signal transmission system. An embodiment of a signal transmission system according to the present invention will be described with reference to FIG. 1.

1 illustrates an outer coder 100, an outer interleaver 110, an inner coder 120, an inner interleaver 130, and a symbol mapper. mapper 140, block selector 150, linear precoder 160, multiple input / output encoder 170, frame builder 180, modulator 190, and transmitter 195. It includes. 1 illustrates a process of processing a signal in the signal transmission system, and the number of transmission paths is not determined.

The outer coder 100 and the outer interleaver 110 may encode and interleave multiplexed data, respectively, in order to improve transmission performance for the input signal.

The inner coder 120 and the inner interleaver 130 perform interleaving by recoding a signal to be transmitted in preparation for an error in the transmission signal. The type of each coder and interleaver may vary according to coding and interleaving schemes used in a corresponding signal transmission system.

The symbol mapper 140 may symbol-map a transmission signal according to a mapping scheme of 16QAM, 64QAM, QPSK, etc. in consideration of a transmission mode and a transmission scheme.

The block selector 150 selects data farther than a coherence time from the symbol data output from the symbol mapper 140 and transmits the data to the linear precoding unit 160. For example, when the coherence time is 't', data within the coherence time is selected due to deep fading by selecting and outputting data that are separated by more than 't' time from the input symbol data. To prevent them from being lost. The selection distance may vary depending on implementation.

The linear precoding unit 160 distributes the input symbol data to a plurality of output symbol data in the time domain, thereby reducing the probability that all information is lost due to fading when experiencing a time selective fading channel.

2 is a block diagram schematically showing a linear precoding unit according to an embodiment of the present invention. The precoding unit 160 includes a serial / parallel converter 162, an encoder 164, and a parallel / serial converter 166.

The serial / parallel converter 162 converts the input data into parallel data. The encoding unit 164 distributes the parallel data to a plurality of data in the time domain through encoding matrixing.

3A is a diagram illustrating a matrix of codes for distributing input data according to an embodiment of the present invention. 3 (a) is called a vanderMonde matrix as an example of an encoding matrix for distributing the input data into a plurality of output data. The input data may be arranged in parallel in the length (L) of the output data.

Θ of the matrix may be expressed by the following equation, and may be defined in other ways. The vanderMonde matrix may adjust its matrix component by Equation 1.

The matrix rotates each input data by the phase of the corresponding Equation 1 and reflects the input data in the output data. Therefore, the input values may be distributed among at least two output values according to the characteristics of the matrix.

In Equation 1, L represents the number of output data. If the input data group input to the encoding unit 164 of FIG. 2 is x and the data group coded and output from the encoding unit 164 by the matrix is y, y is represented by the following equation (2).

3 (b) is a diagram illustrating another code matrix for distributing input data according to an embodiment of the present invention. 3 (b) is called an Hadamard matrix as an example of an encoding matrix for distributing the input data into a plurality of output data. The matrix of FIG. 3 (b) is a general form extended to a size of any L = 2 ^k , and 'L' represents the number of output symbols to distribute each input symbol.

The output symbols of the matrix can be obtained by the sum and difference of the L input symbols. In other words, each input symbol can be spread over L output symbols.

Also in the case of the matrix of FIG. 3B, the input data group input to the encoding unit 164 of FIG. 2 is x, and the data group coded and output from the encoding unit 164 by the matrix is y. Y is the product of the matrix and x.

The parallel / serial converter 166 converts the data received by the encoder 164 back into serial data and outputs the serial data.

The multiple input / output encoder 170 encodes the data precoded by the linear precoding unit 160 to be carried on a plurality of transmission antennas.

There are two types of multiple input / output encoding methods, spatial multiplexing and spatial diversity. Spatial multiplexing is a method in which multiple antennas are transmitted to a transmitter and a receiver to transmit different data at the same time, thereby transmitting data at higher speed without further increasing the bandwidth of the system. Spatial diversity is a method of obtaining transmit diversity by transmitting data of the same information from multiple transmit antennas.

In this case, as the multiple diversity input / output encoder 170 having a spatial diversity scheme, a space-time block code (STBC), a space-frequency block code (SFBC), a space-time trellis code (STTC), or the like may be used. The spatial multiplex multiple input / output encoder 170 simply transmits data streams by separating the number of transmit antennas, and provides full-diversity full-rate (FDFR) code, linear dispersion code (LDC), and V-BLAST. (Vertical-Bell Lab. Layered space-time) and D-BLAST (diagonal-BLAST) can be used.

The frame forming unit 180 forms frame data into which a pilot signal or the like is inserted so as to modulate the precoded signal by a corresponding single transmission carrier (SC) transmission scheme.

The SC (Single Carrier) modulator 190 modulates the data output from the frame former 180 to be carried on the corresponding single carrier. The transmitter 195 converts the digital signal output from the SC modulator 190 into an analog signal and transmits the signal.

4 is a block diagram schematically illustrating a case in which a signal transmission apparatus has a plurality of transmission paths according to an embodiment of the present invention. For convenience of explanation, the following description will be given by using two transmission paths as an example.

The embodiment of FIG. 4 includes an outer coder 400, an outer interleaver 410, an inner coding & interleaving 420, and a symbol mapper 430. , Block selector 440, linear precoder 450, multiple input / output encoder 460, first frame builder 470, second frame builder 475, first modulator ( 480, a second modulator 485, a first transmitter 490, and a second transmitter 495.

Signal processing from the outer coder 400 to the multiple input / output encoder 460 is the same as described with reference to FIG. 1.

The outer coder 400 and the outer interleaver 410 may encode and interleave input data, respectively. For example, in case of VSB (Vestigial Side Bands), Reed-Solomon code may be used as an outer coding method, and convolutional interleaving may be performed as an interleaving method. .

The inner coder and the inner interleaver perform interleaving by recoding a signal to be transmitted in preparation for an error in the transmission signal.

In an example of the VSB scheme, the inner interleaving is performed in a trellis coder in combination with an inner coder in the form of virtual interleaving. Therefore, when inner coding and inner interleaving are performed together in a trellis encoder as in the VSB scheme, which is an example of the single transmission carrier system, an inner coding and interleaving unit including an inner coder and an inner interleaver as one block as shown in FIG. 420.

However, in the case of another single transmission carrier system in which inner coding and inner interleaving are performed separately, the inner coder and the inner interleaver may be illustrated as separate blocks as shown in FIG. 1. That is, this may vary depending on the example of the transmission and reception system to be applied.

The symbol mapper 430 symbol-maps a transmission signal according to a mapping scheme in consideration of a transmission mode, a transmission scheme, and the like. In the case of the 8VSB scheme according to the ATSC standard, three bits of data output from the inner coding & interleaving unit 420 can be mapped to eight VSB symbols.

The block selector 440 selects data farther from the coherence time from the symbol data output from the symbol mapper 430 and transmits the data to the linear precoding unit 450. The selection distance may vary depending on implementation.

The linear precoding unit 450 distributes the input symbol data to a plurality of output symbol data in the time domain, thereby reducing the probability that all information is lost due to fading when subjected to a time selective fading channel.

The linear precoding unit 450 includes a serial / parallel converter, an encoder, and a parallel / serial converter.

5A to 5E illustrate an example of a 2 × 2 code matrix for distributing input symbols according to an embodiment of the present invention. The code matrixes of FIGS. 5A to 5E may be applied to the transmitting apparatus as shown in FIG. 4, and two data input to the encoding unit of the linear precoding unit 450 are distributed to two output data. Let's do it.

The matrix of FIG. 5A is an embodiment of the vanderMonde matrix described with reference to FIG. 3A.

) 회전된 두번째 입력 데이터를 더하여 첫번째 출력 데이터로 출력하며, 첫번째 입력 데이터와 위상이 225도(

) 회전된 두번째 입력 데이터를 더하여 두번째 출력 데이터로 출력한다. 그리고 상기 각 출력 데이터는

로 나누어 스케일링(scaling)한다.The matrix of FIG. 5 (a) is 45 degrees out of phase with the first of the two input data.

) Adds the second rotated input data and outputs it as the first output data. The phase is 225 degrees with the first input data.

) Add the rotated second input data and output it as the second output data. And each output data

Scaling by dividing by.

The matrix of FIG. 5 (b) is an embodiment of the Hadamard matrix described in FIG. 3 (b).

로 나누어 스케일링(scaling)한다.The matrix of FIG. 5 (b) adds the first input data and the second input data among the two input data and outputs the first output data. The second input data is subtracted from the first input data and output as the second output data. And each output data

Scaling by dividing by.

FIG. 5C is a diagram illustrating another example of a code matrix for distributing an input symbol applicable to FIG. 4 according to an embodiment of the present invention. The matrix of FIG. 5C is an embodiment of another code other than the matrix described with reference to FIGS. 3A and 3B.

) 회전 된 첫번째 입력 데이터와 위상이 -45도(

) 회전된 두번째 입력 데이터를 더하여 첫번째 출력 데이터로 출력하며, 위상이 45도 회전된 첫번째 입력 데이터에서 위상이 -45도 회전된 두번째 입력 데이터를 빼서 두번째 출력 데이터로 출력한다. 그리고 상기 각 출력 데이터는

로 나누어 스케일링한다.In the matrix of FIG. 5C, the phase of the two input data is 45 degrees (

) The first input data rotated and the phase is -45 degrees (

The second input data rotated is added to the first output data, and the second input data rotated by -45 degrees is subtracted from the first input data rotated by 45 degrees to output the second output data. And each output data

Divide by to scale.

FIG. 5 (d) is a diagram illustrating another example of a code matrix for distributing input symbols applicable to FIG. 4 according to an embodiment of the present invention. The matrix of FIG. 5D is another embodiment of the code other than the matrix described with reference to FIGS. 3A and 3B.

로 나누어 스케일링한다.The matrix of FIG. 5 (d) adds the first input data multiplied by 0.5 to the second input data and outputs the first output data, and subtracts the second input data multiplied by 0.5 from the first input data and outputs the second output data. And each output data

Divide by to scale.

FIG. 5E illustrates another example of a code matrix for distributing input symbols applicable to FIG. 4 according to an embodiment of the present invention. The matrix of FIG. 5E is another embodiment of the code other than the matrix described with reference to FIGS. 3A and 3B. '*' In FIG. 5 (e) means a complex conjugate with respect to input data.

) 회전된 첫번째 입력 데이터와 두번째 입력 데이터를 더하여 첫번째 출력 데이터로 출력하며, 첫번째 입력 데이터의 켤레 복소수와 위상이 -90(

)도 회전된 두번째 입력 데이터의 켤레 복소수를 더하여 두번째 출력 데이터로 출력한다. 그리고 상기 각 출력 데이터는

로 나누어 스케일링한다.The matrix of FIG. 5E has a phase of 90 degrees between two input data.

) The first input data and the second input data rotated are added to output the first output data. The complex number and phase of the first input data are -90 (

) Also outputs the second output data by adding the complex conjugate of the rotated second input data. And each output data

Divide by to scale.

The precoded data is output to the multiple input / output encoder 460, and the multiple input / output encoder 460 encodes and outputs the input symbol data to be carried on a plurality of transmission antennas. For example, when there are two transmission paths, the multiple input / output encoder 460 outputs the encoded data to the first frame forming unit 470 or the second frame forming unit 475.

In the case of the spatial diversity method, data of the same information is output to the first frame forming unit 470 and the second frame forming unit 475, respectively, and when encoded in the spatial multiplexing method, the first frame forming unit ( Different data is output to the 470 and the second frame forming unit 475, respectively.

The first frame forming unit 470 and the second frame forming unit 475 each form frame data in which a pilot signal is inserted so as to modulate the precoded signal by a corresponding single transmission carrier (SC) transmission scheme. For example, in the VSB method, a VSB transmission frame is formed by receiving a segment synchronization signal and a field synchronization signal.

The first modulator 480 and the second modulator 485 are modulated to transmit the data output from the first frame former 470 and the second frame former 475 on a single transport carrier. do. In the case of the VSB method, the first modulator 480 and the second modulator 485 respectively output data output from the first frame forming unit 470 and the second frame forming unit 475 in the VSB of the intermediate frequency band. Modulate with a signal.

The first transmitter 490 and the second transmitter 495 convert the digital format signals output from the first modulator 480 and the second modulator 485 into analog signals and transmit the analog signals. .

6 is a block diagram schematically illustrating an apparatus for receiving a signal according to an embodiment of the present invention. The embodiment of FIG. 6 may be included in a broadcast receiving device.

6, the receiver 600, the synchronizer 610, the SC (Single Carrier) demodulator 620, the frame parsing unit 630, the multiple input / output decoder 640, linear Precoding decoder 650, block reconstruction unit 660, symbol demapper 670, inner deinterleaver 680, inner decoder 690, outer deinterleaver ( 695 and an outer decoder 697. 6 illustrates a process of processing a signal in the signal receiving system, and the number of receiving paths is not determined.

The receiver 600 down-converts the frequency band of the received RF signal and converts the frequency band into a digital signal. The synchronizer 610 obtains and outputs a synchronization between a frequency domain and a time domain of the received signal output from the receiver 600. The synchronization unit 610 may use an offset result of the frequency domain of the data output by the demodulator 620 to obtain synchronization of the frequency domain signal.

The SC demodulator 620 demodulates the received data output from the synchronizer 610. The SC demodulator 620 demodulates the received data in the reverse of the transmission scheme of the single transmission carrier system. For example, carrier recovery and timing recovery are performed.

The frame parser 630 may output symbol data of a data section excluding a pilot signal according to the frame structure of the signal demodulated by the demodulator 620.

The multiple input / output decoder 640 receives and decodes the data output from the frame parser 630 and outputs one data string. The multiple input / output decoder 640 outputs one data string by decoding according to a scheme corresponding to the scheme encoded by the multiple input / output encoder 170 of FIG.

The linear precoding decoder 650 recovers the original data from the distributed data to be robust to time selective fading. The linear precoding decoder 650 restores data by performing an inverse process of distributing data in the signal transmission apparatus.

7A is a block diagram schematically illustrating an example of a linear precoding decoder according to an embodiment of the present invention. The linear precoding decoder 650 includes a serial / parallel converter 652, a first decoder 654, and a parallel / serial converter 656.

The serial / parallel converter 652 converts the input data into parallel data. The first decoding unit 654 restores the original data from the data distributed through decoding matrixing of the parallel data. The decoding matrix performing the decoding becomes an inverse matrix of the encoding matrix of the signal transmission apparatus. For example, when the signal transmission apparatus encodes using the vanderMonde matrix as shown in FIG. 2, the first decoder 654 restores the distributed data to the original data using the inverse matrix of the vanderMonde matrix. .

The parallel / serial converter 656 converts the parallel data received by the first decoder 654 back into serial data and outputs the serial data.

FIG. 7B is a block diagram schematically showing another example of a linear precoding decoder according to an embodiment of the present invention. The linear precoding decoder 650 includes a serial / parallel converter 651, a second decoder 653, and a parallel / serial converter 655.

The serial / parallel converter 651 converts the input data into parallel data, and the parallel / serial converter 655 serializes the parallel data received by the second decoder 653 again. Convert it to data and output it. The second decoding unit 653 restores and outputs original data distributed in parallel data output from the serial / parallel conversion unit 651 by using ML (Maximum Likelihood) decoding.

The second decoder 653 is an ML decoder considering a transmission scheme in a transmitter. The second decoding unit 653 restores original data distributed in the symbol data by ML decoding the received symbol data so as to correspond to the transmission scheme. That is, the ML decoder decodes the received symbol data in consideration of an encoding rule at the transmitting end.

The block reconstruction unit 660 returns the input data to its original position farther than the coherence time. That is, the block recovery unit 660 performs a reverse process of the process of selecting and outputting data farther than the coherence time from the block selection unit of the signal transmission apparatus to return the data to the original position.

The symbol demapper 670 demaps the symbol data restored to the original position by the block reconstruction unit 660 into a bit string of the corresponding symbol.

An inner deinterleaver 680 performs an inverse process of inner interleaving of the signal transmission apparatus with respect to the input bit stream, and an inner decoder 690 is a decoder corresponding to the inner coder of the signal transmission apparatus. The deinterleaved data may be decoded to correct an error included in the data. In addition, the outer deinterleaver 695 and the outer decoder 697 perform the deinterleaving process and the error correction decoding process again in a manner corresponding to the outer interleaving and the outer coding of the signal transmission apparatus. Output

8 is a block diagram schematically illustrating a case where a signal receiving apparatus has a plurality of receiving paths according to an embodiment of the present invention. For convenience of explanation, the following description will be given by using two reception paths as an example.

8, the first receiver 800, the second receiver 805, the first synchronizer 810, the second synchronizer 815, the first demodulator 820, and the second receiver 810 are provided. Demodulator 825, first frame parser 830, second frame parser 835, multiple input / output decoder 840, linear precoding decoder 850, block reconstruction unit 860, symbol demapper ( 870, an inner deinterleaving & decoding unit 880, an outer deinterleaver 890, and an outer decoder 895.

The first receiver 800 and the second receiver 805 each receive an RF signal, down-convert the frequency band, and convert the digital signal into a digital signal. The first synchronizer 810 and the second synchronizer 815 obtain and synchronize the frequency domain and the time domain of the received signal output from the first receiver 800 and the second receiver 805, respectively. The first synchronization unit 810 and the second synchronization unit 815 are offsets of the frequency domain of the data output from the first demodulator 820 and the second demodulator 825, respectively, in order to obtain synchronization of the frequency domain signals. The results are available.

The first demodulator 820 demodulates the received data output from the first synchronizer 810. For example, in the case of the VSB scheme, demodulation of the received data in the inverse of the VSB modulation scheme, and equalizing the demodulated data. The second demodulator 825 demodulates and equalizes the received data output from the second synchronizer 815.

Each of the first frame parser 830 and the second frame parser 835 excludes a pilot signal according to a frame structure of data demodulated by the first demodulator 820 and the second demodulator 825, respectively. Can output symbol data.

The multiple input / output decoder 840 receives the data output from the first frame parser 830 and the second frame parser 835, respectively, and decodes the signal according to the corresponding scheme of the multiple input / output encoding method in the signal transmission apparatus. After that, it outputs one data string.

Hereinafter, the signal processing from the multiple input / output decoder 840 to the outer decoder 895 is the same as described with reference to FIG. 6.

The linear precoding decoder 850 recovers the original data from the distributed data to be robust to time selective fading. The linear precoding decoder 650 restores data by performing an inverse process of distributing data in the signal transmission apparatus. The linear precoding decoder 850 includes a serial / parallel converter, a first decoder or a second decoder, and a parallel / serial converter.

9 (a) to 9 (e) illustrate an example of a 2 × 2 code matrix for reconstructing distributed symbols according to an embodiment of the present invention. The code matrixes of FIGS. 9 (a) to 9 (e) may be applied to a receiving apparatus as shown in FIG. 8 and recover data distributed to two data input to a decoding unit of the linear precoding decoder 850. To print.

The matrix of FIG. 9 (a) is an embodiment of the vanderMonde inverse matrix and is a decoding matrix corresponding to the encoding matrix of FIG. 5 (a).

) 회전된 첫번째 입력 데이터와 위상이 -225도(

) 회전된 두번째 입력 데이터를 더하여 두번째 출력 데이터로 출력한다. 그리고 상기 각 출력 데이터는

로 나 누어 스케일링(scaling)한다.The matrix of FIG. 9 (a) adds the first input data and the second input data among the two input data and outputs the first output data, and has a phase of −45 degrees (

) The first input data rotated and the phase is -225 degrees (

) Add the rotated second input data and output it as the second output data. And each output data

Divide by to scale.

The matrix of FIG. 9 (b) is an embodiment of the Hadamard inverse matrix and is a decoding matrix corresponding to the encoding matrix of FIG. 5 (b).

로 나누어 스케일링(scaling)한다.The matrix of FIG. 9 (b) adds first input data and second input data among two input data and outputs the first output data, and subtracts the second input data from the first input data and outputs the second output data. And each output data

Scaling by dividing by.

FIG. 9 (c) is a diagram illustrating another example of a code matrix for restoring distributed data applicable to FIG. 8 according to an embodiment of the present invention. The matrix of FIG. 9C is a decoding matrix corresponding to the encoding matrix of FIG. 5C.

) 회전된 첫번째 입력 데이터와 위상이 -45도(

) 회전된 두번째 입력 데이터를 더하여 첫번째 출력 데이터로 출력하며, 위상이 45도 회전된 첫번째 입력 데이터에서 위상이 45도 회전된 두번째 입력 데이터를 빼서 두번째 출력 데이터로 출력한다. 그리고 상기 각 출력 데이터는

로 나누어 스케일링한다.9 (c) has a phase of -45 degrees between two input data.

) The first input data rotated and the phase is -45 degrees (

The second input data rotated is added to the first output data, and the second input data rotated by 45 degrees is subtracted from the first input data rotated by 45 degrees to output the second output data. And each output data

Divide by to scale.

9 (d) is a diagram illustrating another example of a code matrix for restoring distributed data applicable to FIG. 8 according to an embodiment of the present invention. The matrix of FIG. 9 (d) is a decoding matrix corresponding to the encoding matrix of FIG. 5 (d).

로 나누어 스케일링한다.The matrix of FIG. 9 (d) adds first input data multiplied by 0.5 to second input data and outputs the first output data, and subtracts second input data multiplied by 0.5 from the first input data and outputs the second output data. And each output data

Divide by to scale.

FIG. 9E is a diagram illustrating another example of a code matrix for restoring distributed data applicable to FIG. 8 according to an embodiment of the present invention. The matrix of FIG. 9E is a decoding matrix corresponding to the encoding matrix of FIG. 5E. '*' In FIG. 9 (e) denotes a complex conjugate with respect to input data.

) 회전된 첫번째 입력 데이터와 두번째 입력 데이터의 켤레 복소수를 더하여 첫번째 출력 데이터로 출력하며, 첫번째 입력 데이터와 위상이 -90도(

) 회전된 두번째 입력 데이터의 켤레 복소수를 더하여 두번째 출력 데이터로 출력한다. 그리고 상기 각 출력 데이터는

로 나누어 스케일링한다.The matrix of FIG. 9 (e) has a phase of −90 degrees (

The first input data is rotated and the complex of the second input data is added to output the first output data. The first input data and the phase are -90 degrees (

) Adds the complex conjugate of the rotated second input data and outputs it as the second output data. And each output data

Divide by to scale.

The block reconstruction unit 860 returns the input data to its original position farther than the coherence time, and the symbol demapper 870 restores the symbol restored to the original position by the block reconstruction unit 860. Demap the data into the bit string of the symbol.

The inner deinterleaving & decoding unit 880 is a block corresponding to the inner interleaving & encoding unit 420 of FIG. 4 with respect to the input bit string, and deinterleaves and decodes an input signal to correct an error included in the data. can do.

When inner coding and inner interleaving are performed together in the trellis encoder as in the VSB method, which is an example of a single transmission carrier system, the inner coder and the inner interleaver may be illustrated as an inner coding and interleaving unit 420 as one block. In the corresponding signal receiving apparatus, inner deinterleaving and inner decoding may be illustrated together with the inner deinterleaving & decoding unit 880.

However, in the case of another single transmission carrier system in which inner deinterleaving and inner decoding are performed separately, the inner deinterleaver and the inner decoder may be illustrated as separate blocks as shown in FIG. 6. That is, this may vary depending on the example of the transmission and reception system to be applied.

In addition, the outer deinterleaver 890 and the outer decoder 895 perform the deinterleaving process and the error correction decoding process again in a manner corresponding to the outer interleaving and the outer coding of the signal transmission apparatus. Output

10 is a flowchart illustrating a signal transmission / reception method according to an embodiment of the present invention.

The signal transmission apparatus selects a transmission symbol that is farther than the coherence time of the channel among the mapped symbol data (S1000) to reduce the probability that all data within the time due to deep fading is lost. The selection distance may vary depending on implementation.

Precoding is performed to distribute the selected symbol data to a plurality of output symbols in the time domain (S1010), so that the transmission data is robust to time selective fading.

The pre-coded data is multi-input / output encoded so that a plurality of antennas can be transmitted (S1020). The number of antennas can be the number of possible data transmission paths. In the case of the spatial diversity method, data of the same information is transmitted in each path, and in the case of the spatial multiplexing method, different data is transmitted in each path.

In operation S1030, the encoded data is converted into a transmission frame, modulated, and transmitted according to the number of the multi-input / output transmission paths.

The signal receiving apparatus receives the transmitted signal using the plurality of receiving antennas, and demodulates the received signal into data frames (S1040).

The demodulated data frame is parsed and decoded according to a scheme corresponding to a multiple input / output encoded scheme to obtain one symbol data string (S1050).

The output data stream is decoded in the inverse of the method precoded by the transmitting device to restore original data distributed to a plurality of symbol data in the time domain (S1060).

The restored symbol data is restored to an original position farther than the coherence time (S1070). The symbol data may be restored to its original position by performing a reverse process of selecting a transmission symbol in S1000.

The signal transceiving method and the signal transceiving apparatus are not limited to the above examples, and may be applied to all signal transceiving systems to which a multi-input / output method is applied.

The present invention is not limited to the above-described embodiments, and as can be seen in the appended claims, modifications can be made by those skilled in the art to which the invention pertains, and such modifications are within the scope of the present invention.

As described above, according to the signal transmission and reception method and the signal transmission and reception apparatus of the present invention, the input data is distributed and transmitted in the time domain, thereby making it more robust to time selective fading of each transmission channel, thereby improving signal reception performance of the receiver.

Claims (17)

A symbol mapper for mapping the input data into symbol data according to a corresponding transmission method; A block selector configured to select and output data farther from a coherence time in the symbol data; A precoding unit for coding and outputting the selected symbol data to be distributed over at least two symbol data in a time domain; And And a multiple input / output encoder for encoding the precoded data to be transmitted in multiplex. The method of claim 1, The precoding unit, A serial / parallel converter for converting input serial data into parallel data; An encoding unit which multiplies the parallel data by an encoding matrix and distributes the parallel data; And And a parallel / serial conversion unit for converting the encoded output parallel data into serial data. The method of claim 2, And the encoding matrix is a vanderMonde matrix. In the vanderMonde matrix Θ, the number of output data is a natural number L and the component θ of the matrix is a natural number k.

If,

. The method of claim 2, And the encoding matrix is a Hadamard matrix. The Hadamard (H _{2 ^ k} ) matrix is a natural number L = 2 ^k when the number of output data,

The method of claim 2, And the encoding matrix is the following matrix when outputting two parallel data to be divided into two data.

The method of claim 2, And the encoding matrix is the following matrix when outputting two parallel data to be divided into two data.

The method of claim 2, And the encoding matrix is the following matrix when outputting two parallel data to be divided into two data. () ^* Is the complex conjugate of the input data.

Selecting and outputting data farther than a coherence time among symbol data mapped according to a corresponding transmission scheme; Coding and outputting the selected symbol data to be distributed over at least two symbol data in a time domain; And Multiple input / output encoding so that the coded data can be transmitted in multiplex. A multiple input / output decoder configured to decode multiple received data and output one symbol data string; A precoding decoder for restoring data distributed in a time domain from the output symbol data string; A block restoring unit for restoring the restored symbol data to an original position farther than a coherence time; And And a symbol demapper for demapping the symbol data returned to the original position and outputting bit data corresponding to the symbol. The method of claim 9, The precoding decoder, A serial / parallel converter for converting input serial data into parallel data; A first decoding unit multiplying the parallel data by a decoding matrix and restoring data distributed in a time domain of the parallel data; And And a parallel / serial converter converting the decoded and restored parallel data into serial data. The method of claim 10, And the decoding matrix is an inverse matrix of a vanderMonde matrix. The method of claim 10, And the decoding matrix is an inverse matrix of a Hadamarde matrix. The method of claim 10, And a decoding matrix is the following matrix when restoring and outputting two pieces of data dispersed in two parallel data inputted.

The method of claim 10, And a decoding matrix is the following matrix when restoring and outputting two pieces of data dispersed in two parallel data inputted.

The method of claim 10, And a decoding matrix is the following matrix when restoring and outputting two pieces of data dispersed in two parallel data inputted.

The method of claim 9, The precoding decoder, A serial / parallel converter for converting input serial data into parallel data; A second decoding unit for restoring data distributed in a time domain by decoding the parallel data according to a transmission scheme; And And a parallel / serial converter converting the decoded and restored parallel data into serial data. Outputting one symbol data string by multiple input / output decoding of multiplely received data; Restoring data distributed in a time domain by decoding the output symbol data; And Returning the recovered symbol data to an original position farther than a coherence time, and demapping the returned symbol data.

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