CN103428140A - Method for sending signal and signal sender - Google Patents
Method for sending signal and signal sender Download PDFInfo
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- CN103428140A CN103428140A CN2012101524471A CN201210152447A CN103428140A CN 103428140 A CN103428140 A CN 103428140A CN 2012101524471 A CN2012101524471 A CN 2012101524471A CN 201210152447 A CN201210152447 A CN 201210152447A CN 103428140 A CN103428140 A CN 103428140A
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Abstract
The invention discloses a signal sender and a method for sending a signal. The method for sending the signal mainly comprises the steps that the amplitude and the phase of a digital baseband signal is adjusted through a baseband amplitude phase adjuster according to the set requirements for the amplitude and the phase of a carrier amplifier or a peak amplifier and the adjusted digital baseband signal is converted to a radio-frequency signal and output to the corresponding carrier amplifier or the corresponding peak amplifier for power amplification. According to the scheme, due to the fact that the amplitude and the phase of the digital baseband signal is adjusted accurately in a numeric field, the expression of the digital baseband signal in a radio-frequency field can satisfy the requirements for the amplitude and the phase of the input radio-frequency signal of the carrier amplifier or the peak amplifier, the linear performance and the efficiency of the carrier amplifier and the peak amplifier reach the optimal state, and namely the linear performance and the efficiency of the signal sender are improved.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of method transmitted and signal transmitter.
Background technology
Along with the development of global communication business, it is more and more valuable that the communication spectrum resource becomes.In order more to effectively utilize frequency spectrum resource, many communication systems have all adopted the modulation system that the availability of frequency spectrum is higher, as Quadrature Phase Shift Keying (Quadrate Phase Shift Keying, QPSK), orthogonal amplitude keying (Quadrate Amplitude Modulation, QAM) etc., these modulation systems are not only modulated carrier phase, also modulated carrier amplitude simultaneously, therefore can produce the non-constant enveloped modulation signal of larger peak-to-average force ratio, multi-transceiver technology for extensive use produces De He road signal, will form larger envelope rises and falls, the peak value of signal all can increase, in addition, even for Gaussian-filtered minimum shift keying (Gaussian Filtered Minimum Shift Keying, GMSK) etc. the constant enveloped modulation signal that modulation system produces, if adopted multi-transceiver technology, the synthetic of carrier wave can produce larger peak-to-average force ratio equally, thereby D/A conversion unit, radio frequency unit and the power amplifier etc. of transmitter are proposed to higher linear requirement.
In addition, along with the Large scale construction of communication network, in order to reduce equipment investment and operation cost, the efficiency of transmitter also needs to be improved greatly, and higher efficiency not only can be saved the electricity charge for operator, can also save the investment of the auxiliary facilities such as power supply.
At present, usually adopt digital technology to solve the linear requirement of transmitter, adopt radio-frequency technique to solve the efficiency requirement of transmitter.As shown in Figure 1, be the structural representation of transmitter in prior art, mainly comprise baseband signal processing unit, D/A conversion unit, quadrature modulator unit, simulation up-conversion unit and power amplifier etc.If the signal of preparing to be launched is homophase (In-phase, I)/quadrature (Quadrate, Q) baseband signal, the processing procedure of this I/Q baseband signal in above-mentioned transmitter is:
The first step, baseband signal processing unit carries out the processing of correlated digital signals Processing Algorithm to described I/Q baseband signal, and it is become to digital baseband signal, and in this step, operation technique is digital technology.
Second step, D/A conversion unit carries out the digital-to-analogue conversion processing to described digital baseband signal, is converted into analog signal.
The 3rd step, the quadrature modulation unit carries out the quadrature modulation processing to described analog signal, and it is become to analog if signal.
The 4th step, simulation up-conversion unit carries out upconversion process to described analog if signal, and it is become to radiofrequency signal.
The purpose of above-mentioned second step, the 3rd step and the 4th step is that digital baseband signal is converted to radiofrequency signal, to meet the processing requirements of radio frequency domains to signal.
The 5th step, power amplifier is amplified rear output by described radiofrequency signal, and the technology of using in this step 5 is radio-frequency technique.
In the transmitter architecture shown in upper Fig. 1, power amplifier uses Doherty (Doherty) power amplifier as shown in Figure 2 usually, the linearity of this Doherty power amplifier is relative with efficiency better, its operation principle is: when the carrier amplifier emergent power compresses, utilize the power gain expanded function of peak amplifier to compensate, carry out power at output and synthesize, form linear input/output relation.The process that the radiofrequency signal of exporting in above-mentioned the 4th step is processed at the Doherty power amplifier shown in Fig. 2 is as follows:
The first step, power splitter is divided into the two-way radiofrequency signal by the radiofrequency signal of input, is also first via radiofrequency signal and the second tunnel radiofrequency signal.
Second step, the requirement to input radio frequency signal amplitude and phase place according to carrier amplifier of the first amplitude modulator and the first phase modulator, carry out the amplitude modulation and phase modulation processing to first via radiofrequency signal, the first via radiofrequency signal after being processed; The requirement to input radio frequency signal amplitude and phase place to the foundation peak amplifier of the second amplitude modulator and the second phase modulator, carry out the amplitude modulation and phase modulation processing to the second tunnel radiofrequency signal, the second tunnel radiofrequency signal after being processed.
The 3rd step, 1/4 wavelength delay line is entered into peak amplifier and carries out power amplification, the first via radiofrequency signal after being amplified after the first via radiofrequency signal after amplitude modulation and phase modulation is processed is carried out to 1/4 wavelength delay; Carrier amplifier carries out power amplification to the second tunnel radiofrequency signal after processing, and is entered into 1/4 wavelength transmission line and carries out the impedance matching processing, obtains the second tunnel radiofrequency signal after impedance transformation.
The 4th step, the radiofrequency signal obtained after the second tunnel radiofrequency signal of 1/4 wavelength impedance transducer after to the first via radiofrequency signal by after amplifying and impedance transformation merges is carried out the impedance matching conversion, and the radiofrequency signal after change is exported.
When the above-mentioned Doherty of utilization power amplifier is processed radiofrequency signal, in order to make carrier amplifier and peak amplifier can be operated in optimum state (cooperation that is also both makes the efficiency of power amplifier and linearity all reach best), first via radiofrequency signal and the second tunnel radiofrequency signal have been carried out respectively to amplitude modulation and phase modulation processing, linearity and the efficiency of Doherty power amplifier have been improved to a certain extent, but owing to radiofrequency signal being carried out to processing along separate routes, and to first via radiofrequency signal with the second tunnel radiofrequency signal is carried out amplitude and Phase Processing is utilizing analogue technique to carry out, it is also power splitter, the first amplitude modulator, the second amplitude modulator, the first phase modulator and the second phase modulator all adopt analog circuit to realize, and the intrinsic control inaccuracy of analog circuit, the shortcomings such as consistency is poor, this just makes according to carrier amplifier the requirement of input radio frequency signal amplitude and phase place is adjusted first via radiofrequency signal, and while according to peak amplifier, the requirement of input radio frequency signal amplitude and phase place being adjusted the second tunnel radiofrequency signal, can not realize the amplitude of first via radiofrequency signal and the second tunnel radiofrequency signal and the accurate adjustment of phase place, cause power amplifier when work, can not realize that linear and efficiency reaches optimum state, and then cause the linearity of transmitter and efficiency lower.
Summary of the invention
A kind of method that the embodiment of the present invention provides signal transmitter and transmitted, in order to linearity and the not high problem of efficiency that solves the transmitter existed in prior art.
A kind of signal transmitter, described signal transmitter comprises: digital signal processing unit, signal conversion unit and power amplification unit;
Described digital signal processing unit comprises: baseband signal separator and N the described N of baseband amplitude phase regulator is greater than 1 positive integer;
Described power amplification unit comprises: mixer, 1 carrier amplifier and N-1 peak amplifier, wherein, N-1 baseband amplitude phase regulator is corresponding one by one with a described N-1 peak amplifier, and remaining 1 baseband amplitude phase regulator is corresponding with described carrier amplifier;
Described baseband signal separator, be separated into N railway digital baseband signal for the digital baseband signal by input, and export to respectively N baseband amplitude phase regulator;
Arbitrary baseband amplitude phase regulator, for the setting requirement to amplitude and phase place according to corresponding carrier amplifier or peak amplifier, the digital baseband signal received is carried out to the adjustment of amplitude and phase place, and the digital baseband signal after adjusting is exported to signal conversion unit;
Described signal conversion unit, be converted to N road radiofrequency signal for the N railway digital baseband signal by N baseband amplitude phase regulator input, and wherein N-1 road radiofrequency signal is exported to N-1 peak amplifier, remaining 1 tunnel radiofrequency signal is exported to carrier amplifier, and described N-1 road radiofrequency signal is to be converted to by the digital baseband signal after the baseband amplitude phase regulator adjustment corresponding with peak amplifier;
Described carrier amplifier, amplified for the radiofrequency signal to receiving, and this carrier amplifier is operated in the AB class simultaneously;
Arbitrary peak amplifier, amplified for the radiofrequency signal to receiving, and this peak amplifier is operated in the C class simultaneously;
Described mixer, output after merging for the N road radiofrequency signal after amplifying.
A kind of method of utilizing above-mentioned signal transmitter to transmit, described method comprises:
The baseband signal separator is separated into N railway digital baseband signal by the digital baseband signal of input, and exports to respectively N baseband amplitude phase regulator;
Arbitrary baseband amplitude phase regulator is the setting requirement to amplitude and phase place according to corresponding carrier amplifier or peak amplifier, the digital baseband signal received is carried out to the adjustment of amplitude and phase place, and the digital baseband signal after adjusting is exported to signal conversion unit;
Signal conversion unit is converted to N road radiofrequency signal by the N railway digital baseband signal of N baseband amplitude phase regulator input, and wherein N-1 road radiofrequency signal is exported to N-1 peak amplifier, and remaining 1 tunnel radiofrequency signal is exported to carrier amplifier, described N-1 road radiofrequency signal is to be converted to by the digital baseband signal after the baseband amplitude phase regulator adjustment corresponding with peak amplifier;
After carrier amplifier and arbitrary peak amplifier are amplified the radiofrequency signal received separately, output after the N road radiofrequency signal after amplifying by mixer merges.
The signal transmitter that the embodiment of the present invention provides, due to the setting requirement to amplitude and phase place according to carrier amplifier or peak amplifier to digital baseband signal, carried out the adjustment of amplitude and phase place at numeric field, made its performance in radio frequency domains meet the requirement to carrier wave and phase place of carrier amplifier or peak amplifier.And the baseband amplitude phase regulator of digital baseband signal being adjusted at numeric field is to adopt digital circuit, the control accuracy had is high, the characteristics of high conformity, therefore, this just makes the accurate adjustment that can realize its amplitude and phase place to digital baseband signal, and then while making power amplification unit be amplified the radiofrequency signal that is converted to of the digital baseband signal by after amplitude and phase place adjustment of input, can realize that linear and efficiency reaches optimum state, also improved linearity and the efficiency of signal transmitter.
The accompanying drawing explanation
The structural representation that Fig. 1 is transmitter in prior art;
The structural representation that Fig. 2 is Doherty power amplifier in background technology;
The electrical block diagram that Fig. 3 is the signal transmitter in the embodiment of the present invention one;
The electrical block diagram that Fig. 4 is the signal transmitter in the embodiment of the present invention two;
The electrical block diagram that Fig. 5 is the signal transmitter in the embodiment of the present invention three;
The electrical block diagram that Fig. 6 is the signal transmitter in the embodiment of the present invention three;
Fig. 7 is the method schematic diagram transmitted in the embodiment of the present invention four.
Embodiment
The embodiment of the present invention provides a kind of method transmitted and signal transmitter, the operation principle of signal transmitter is: the baseband amplitude phase regulator is the setting requirement to amplitude and phase place according to carrier amplifier or peak amplifier to digital baseband signal, at numeric field, described digital baseband signal is carried out the adjustment of amplitude and phase place, the radiofrequency signal that carrier amplifier or the peak amplifier utilization digital baseband signal after to amplitude and phase place adjustment obtains after being changed is amplified.
In embodiments of the present invention, N baseband amplitude phase regulator arranged in the digital signal processing unit of signal transmitter, 1 carrier amplifier and N-1 peak amplifier are arranged in power amplification unit, described N is greater than 1 positive integer, accordingly, in the preferred embodiment of the present invention, also have N time delay Initial delay regulator and N parameter regulator in digital signal processing unit, a described N Initial delay regulator is corresponding one by one with N baseband amplitude phase regulator, N-1 parameter regulator is corresponding one by one with N-1 peak amplifier, remaining 1 parameter regulator is corresponding with carrier amplifier, wherein, choosing of the number of N, can determine according to actual needs, and that generally choose is N=2 or N=3.
Below in conjunction with accompanying drawing, the method transmitted that the N=3 of take provides the embodiment of the present invention as example and the embodiment of signal transmitter are described in detail, and the signal transmitter of N when other are greater than the signal transmitter of 1 positive integer and N=3 except 3 is similar.
Embodiment mono-
As shown in Figure 3, the electrical block diagram of the signal transmitter provided for the embodiment of the present invention one, comprising: digital signal processing unit 11, signal conversion unit 12 and power amplification unit 13.
Wherein, digital signal processing unit 11 comprises: baseband signal separator 114 and baseband amplitude phase regulator 121, baseband amplitude phase regulator 122, baseband amplitude phase regulator 123;
Preferably, baseband signal separator 114, according to 3 equipartition principles, be divided into by the digital baseband signal of input the digital baseband signal that 3 tunnel amplitudes equate, phase place is consistent for the digital baseband signal by input.
Baseband amplitude phase regulator 121, for the setting requirement of 521 pairs of amplitudes of the carrier amplifier according to corresponding and phase place, carry out the adjustment of amplitude and phase place to the digital baseband signal received, and the digital baseband signal after adjusting is exported to signal conversion unit 12;
Baseband amplitude phase regulator 122, for the setting requirement of 522 pairs of amplitudes of the peak amplifier according to corresponding and phase place, carry out the adjustment of amplitude and phase place to the digital baseband signal received, and the digital baseband signal after adjusting is exported to signal conversion unit 12;
Baseband amplitude phase regulator 123, for the setting requirement of 523 pairs of amplitudes of the peak amplifier according to corresponding and phase place, carry out the adjustment of amplitude and phase place to the digital baseband signal received, and the digital baseband signal after adjusting is exported to signal conversion unit 12;
Concrete, described signal conversion unit 12 comprises: digital to analog converter 221, digital to analog converter 222, digital to analog converter 223, upconverter 321, upconverter 322, upconverter 323 and the 3rd local oscillator 120.
Preferably, consider that the power of the radiofrequency signal that signal conversion unit is exported is very little, for making peak amplifier or carrier amplifier, can carry out larger amplification to radiofrequency signal, described power amplification unit also comprises:
Promote level amplifier 421, promote level amplifier 422 and promote level amplifier 423.
Described digital to analog converter 221, with baseband amplitude phase regulator 121, with upconverter 321, be connected, be converted to analog baseband signal for the digital baseband signal by 121 outputs of baseband amplitude phase regulator, and described analog baseband signal is carried out to upconversion process obtain analog if signal, and export described analog if signal to upconverter 321.
Described digital to analog converter 222, with baseband amplitude phase regulator 122, with upconverter 322, be connected, be converted to analog baseband signal for the digital baseband signal by 122 outputs of baseband amplitude phase regulator, and described analog baseband signal is carried out to upconversion process obtain analog if signal, and export described analog if signal to upconverter 322.
Described digital to analog converter 223, with baseband amplitude phase regulator 123, with upconverter 323, be connected, be converted to analog baseband signal for the digital baseband signal by 123 outputs of baseband amplitude phase regulator, and described analog baseband signal is carried out to upconversion process obtain analog if signal, and export described analog if signal to upconverter 323.
Described upconverter 321, be connected with a promotion level amplifier 421 with the 3rd local oscillator 120, for utilizing the 3rd local oscillator 120, the analog if signal of reception carried out to upconversion process, obtains radiofrequency signal and export to promoting a level amplifier 421.
Described upconverter 322, be connected with a promotion level amplifier 422 with the 3rd local oscillator 120, for utilizing the 3rd local oscillator 120, the analog if signal of reception carried out to upconversion process, obtains radiofrequency signal and export to promoting a level amplifier 422.
Described upconverter 323, be connected with a promotion level amplifier 423 with the 3rd local oscillator 120, for utilizing the 3rd local oscillator 120, the analog if signal of reception carried out to upconversion process, obtains radiofrequency signal and export to promoting a level amplifier 423.
Described promotion level amplifier 421, be connected with carrier amplifier 521 with upconverter 321, for going the radiofrequency signal received, amplified, and the radiofrequency signal after the output amplification is to carrier amplifier 521.
Described promotion level amplifier 422, be connected with peak amplifier 522 with upconverter 322, for going the radiofrequency signal received, amplified, and the radiofrequency signal after the output amplification is to carrier amplifier 523.
Described promotion level amplifier 423, be connected with peak amplifier 523 with upconverter 323, for going the radiofrequency signal received, amplified, and the radiofrequency signal after the output amplification is to carrier amplifier 523.
In above-mentioned signal transmitter, both combined the Doherty technology higher to radio frequency signal power amplification efficiency, realizing at numeric field of the amplitude modulation that has realized again will be in prior art realizing in radio frequency domains, the function success of phase modulation, brought following beneficial effect: at first, realize the technology complementation of digital technology and radio-frequency technique, be conducive to linearity and the efficiency of optimizing transmitter; Secondly, improved the precision of amplitude modulation, phase modulation, made carrier amplifier and the peak amplifier can both well collaborative works, linearity and efficiency keeps optimum state constantly; Again, due to the high conformity of digital circuit, amplitude modulation, phase modulation are realized by digital technology, have promoted the consistency of whole signal transmitter.
Preferably, for the radiofrequency signal radiofrequency signal after the amplification that realizes carrier amplifier 421, peak amplifier 422 and peak amplifier 423 outputs, can mate with the rear class load impedance characteristic, described power amplification unit also comprises: 1/4 wavelength transmission line 131,1/4 wavelength impedance transducer 132;
Described 1/4 wavelength transmission line 131, carry out impedance transformation for the radiofrequency signal after the amplification to carrier amplifier 521 outputs, and by the output of the radiofrequency signal after impedance transformation mixer 130;
Described 1/4 wavelength impedance transducer 132, for receiving the radiofrequency signal of mixer 130 outputs, and carry out the impedance transformation processing to the radiofrequency signal received, and the radiofrequency signal output after impedance transformation is processed.
Embodiment bis-:
Consider when the peak-to-average force ratio of signal is larger, linearity to transmitter is had relatively high expectations, and the nonlinear characteristic of the carrier amplifier in transmitter and peak amplifier itself, in order to reduce the linear requirement to transmitter, and the nonlinear characteristic of improving carrier amplifier and peak amplifier itself, the scheme of two couples of embodiment mono-of the embodiment of the present invention is done further optimization, and particularly, the electrical block diagram of the signal transmitter of the present embodiment two as shown in Figure 4.
Described digital signal processing unit 11 also comprises: baseband signal peak-to-average force ratio inhibitor 111 and base band linearisation preprocessor 112.
Described baseband signal peak-to-average force ratio inhibitor 111, carry out the peak-to-average force ratio inhibition for the digital baseband signal to described input, and the digital baseband signal after the peak-to-average force ratio obtained is suppressed is exported to base band linearisation preprocessor 112;
Described base band linearisation preprocessor 112, carry out the linearisation preliminary treatment for the digital baseband signal to receiving, and the pretreated digital baseband signal of linearisation exported to baseband signal separator 114.
Preferably, because the grid voltage value of the linearity for adjusting carrier amplifier and peak amplifier and efficiency is relevant with the envelope of the radiofrequency signal of input, for the grid voltage value that can make carrier amplifier and peak amplifier realizes adjusting in real time, make carrier amplifier and peak amplifier can realize that linear and efficiency reaches optimum, described digital signal processing unit also comprises: envelop extractor 113, Initial delay regulator 621, Initial delay regulator 622, Initial delay regulator 623, parameter regulator 721, parameter regulator 722, parameter regulator 722, wherein, parameter regulator 721 is corresponding with carrier amplifier 521, parameter regulator 722 is corresponding with carrier amplifier 522, parameter regulator 723 is corresponding with carrier amplifier 523,
Described envelop extractor 113, carry out envelope extraction for the digital baseband signal to 111 outputs of baseband signal peak-to-average force ratio inhibitor, obtains 3 railway digital baseband envelope signals, and export to respectively Initial delay regulator 621, Initial delay regulator 622 and Initial delay regulator 623;
Described signal conversion unit 12, also for the 3 railway digital gate voltage signal envelope value that will receive, be converted to 3 tunnel simulation grid voltage envelope signals, and the simulation grid voltage envelope signal obtained after being changed the digital gate voltage signal envelope value of parameter regulator 721 inputs is exported to carrier amplifier 521, the simulation grid voltage envelope signal obtained after simultaneously being changed the digital gate voltage signal envelope value of parameter regulator 722 inputs is exported to peak amplifier 522, the simulation grid voltage envelope signal obtained after simultaneously being changed the digital gate voltage signal envelope value of parameter regulator 723 inputs is exported to carrier amplifier 523,
Preferably, Initial delay regulator 621 is corresponding with baseband amplitude phase regulator 121, and Initial delay regulator 622 is corresponding with baseband amplitude phase regulator 122, and Initial delay regulator 623 is corresponding with baseband amplitude phase regulator 123.
Described Initial delay regulator 621, on signal transmission path specifically for baseband amplitude phase regulator 121 places, signal exports first duration of going through of the carrier amplifier 521 that this baseband amplitude phase regulator is corresponding to from baseband signal peak-to-average force ratio inhibitor 111, the digital baseband envelope signal received is carried out to the time delay adjustment, make on the signal transmission path at self place, the second duration of going through that signal exports carrier amplifier 521 to from baseband signal peak-to-average force ratio inhibitor 111 equals described the first duration.
Described Initial delay regulator 622, on signal transmission path specifically for baseband amplitude phase regulator 122 places, signal exports first duration of going through of the peak amplifier 522 that this baseband amplitude phase regulator is corresponding to from baseband signal peak-to-average force ratio inhibitor 111, the digital baseband envelope signal received is carried out to the time delay adjustment, make on the signal transmission path at self place, the second duration of going through that signal exports peak amplifier 522 to from baseband signal peak-to-average force ratio inhibitor 111 equals described the first duration.
Described Initial delay regulator 623, on signal transmission path specifically for baseband amplitude phase regulator 123 places, signal exports first duration of going through of the peak amplifier 523 that this baseband amplitude phase regulator is corresponding to from baseband signal peak-to-average force ratio inhibitor 111, the digital baseband envelope signal received is carried out to the time delay adjustment, make on the signal transmission path at self place, the second duration of going through that signal exports peak amplifier 523 to from baseband signal peak-to-average force ratio inhibitor 111 equals described the first duration.
Described carrier amplifier 521, specifically for the simulation grid voltage envelope signal according to receiving, amplified the radiofrequency signal received;
Described peak amplifier 522, specifically for the simulation grid voltage envelope signal according to receiving, amplified the radiofrequency signal received.
Described peak amplifier 523, specifically for the simulation grid voltage envelope signal according to receiving, amplified the radiofrequency signal received.
Preferably, described signal conversion unit 12 also comprises: digital to analog converter 821, digital to analog converter 822, digital to analog converter 823;
Preferably, in order to meet the requirement to the grid voltage value of carrier amplifier or peak amplifier, described power amplification unit also comprises: carrier amplifier grid voltage controller 921, peak amplifier grid voltage controller 922 and peak amplifier grid voltage controller 923;
Described digital to analog converter 821, be connected with carrier amplifier grid voltage controller 921 with parameter regulator 721, and the digital gate voltage signal envelope value that parameter regulator 721 is exported is converted to simulation grid voltage envelope signal and exports carrier amplifier grid voltage controller 921 to;
Described digital to analog converter 822, be connected with peak amplifier grid voltage controller 922 with parameter regulator 722, and the digital gate voltage signal envelope value that parameter regulator 722 is exported is converted to simulation grid voltage envelope signal and exports peak amplifier grid voltage controller 922 to;
Described digital to analog converter 823, be connected with peak amplifier grid voltage controller 923 with parameter regulator 723, and the digital gate voltage signal envelope value that parameter regulator 722 is exported is converted to simulation grid voltage envelope signal and exports peak amplifier grid voltage controller 923 to;
Described carrier amplifier grid voltage controller 921, with digital to analog converter 821, with carrier amplifier 521, be connected, carry out filtering and amplify and process for the simulation grid voltage envelope signal to receiving, and the simulation grid voltage envelope signal after the output amplification is to carrier amplifier 521, as the grid voltage value of carrier amplifier 521.
Described peak amplifier grid voltage controller 922, with digital to analog converter 822, with peak amplifier 522, be connected, carry out filtering and amplify and process for the simulation grid voltage envelope signal to receiving, and the simulation grid voltage envelope signal after the output amplification is to peak amplifier 522, as the grid voltage value of peak amplifier 522.
Described peak amplifier grid voltage controller 923, with digital to analog converter 823, with carrier amplifier 523, be connected, carry out filtering and amplify and process for the simulation grid voltage envelope signal to receiving, and the simulation grid voltage envelope signal after the output amplification is to peak amplifier 523, as the grid voltage value of peak amplifier 523;
Described carrier amplifier 521, specifically for the simulation grid voltage envelope signal according to receiving, amplified the radiofrequency signal received;
Described peak amplifier 522, specifically for the simulation grid voltage envelope signal according to receiving, amplified the radiofrequency signal received;
Described peak amplifier 523, specifically for the simulation grid voltage envelope signal according to receiving, amplified the radiofrequency signal received.
Embodiment tri-:
Consider that carrier amplifier in power amplification unit and the power amplification characteristic of peak amplifier can change along with power, temperature, time etc., for compensating accurately in real time the non-linear of carrier amplifier and peak amplifier, make linearity and the efficiency of described signal transmitter reach optimum, the embodiment of the present invention three is on the basis of embodiment mono-and embodiment bis-, the circuit structure of signal transmitter is done further to optimize, and its schematic diagram as shown in Figure 5.
Described power amplification unit also comprises: coupler 133, and described signal transmitter also comprises: feedback monitoring unit 14;
Described coupler 133, export feedback monitoring unit 14 to for the radiofrequency signal coupling that receives described mixer 130 outputs;
Described base band linearisation preprocessor 112, digital baseband signal specifically for the digital baseband signal by 111 outputs of baseband signal peak-to-average force ratio inhibitor and 14 outputs of feedback monitoring unit compares, adjust the pretreatment parameter of self according to comparative result, and the digital baseband signal of baseband signal peak-to-average force ratio inhibitor 111 being exported again according to the pretreatment parameter after adjusting carries out the linearisation preliminary treatment.
Set up the feedback network of transmitter by above-mentioned feedback monitoring unit 14, and then the base band linearisation preprocessor 112 in auxiliary figure channel bank 11 carries out the adaptive digital baseband signal that baseband signal peak-to-average force ratio inhibitor 111 is exported again and carries out the linearisation preliminary treatment.
Preferably, described feedback monitoring unit 14 comprises: the first analog down converter 140, the first local oscillator 141, the first analog to digital converter 142, the first digital down converter 143 and the first digital filter 144;
The first analog down converter 140, carry out down-converted for the radiofrequency signal of utilizing 141 pairs of described coupler 133 outputs of the first local oscillator, obtains analog if signal and export to the first analog to digital converter 142;
The first analog to digital converter 142, carry out analog-to-digital conversion for the analog if signal to receiving, and obtains digital medium-frequency signal and export to the first digital down converter 143;
The first digital down converter 143, carry out down-converted for the digital medium-frequency signal to receiving, and obtains digital baseband signal and export to the first digital filter 144;
The first digital filter 144, carry out the filtering processing for the digital baseband signal to receiving, and obtains the digital baseband signal after filtering is processed and export to described base band linearisation preprocessor 112.
Preferably, in order to expand the range of application of described signal transmitter, make described signal transmitter to be processed the radiofrequency signal of input, described signal transmitter also comprises:
Signal receiving unit 15, for received RF signal, and processed this radiofrequency signal, obtains digital baseband signal, and export to baseband signal peak-to-average force ratio inhibitor 111.
Preferably, described signal receiving unit 15 comprises: the second analog down converter 150, the second local oscillator 151, the second analog to digital converter 152, the second digital down converter 153 and the second digital filter 154;
Described the second analog down converter 150, carry out down-converted for the radiofrequency signal of utilizing 151 pairs of inputs of the second local oscillator, obtains analog if signal and export to the second analog to digital converter 152;
Described the second analog to digital converter 152, carry out analog-to-digital conversion for the analog if signal to receiving, and obtains digital medium-frequency signal and export to the second digital down converter 153;
Described the second digital down converter 153, carry out down-converted for the digital medium-frequency signal to receiving, and obtains digital baseband signal and export to the second digital filter 154;
Described the second digital filter 154, carry out the filtering processing for the digital baseband signal to receiving, and obtains the digital baseband signal after filtering is processed and export to described baseband signal peak-to-average force ratio inhibitor 111.
It should be noted that, the division of each unit is not limited to above-mentioned zoned format, as long as can realize according to the operation principle of above-mentioned transmitter the emission of signal, for example: the first digital down converter 143 and the first digital filter 144 in above-mentioned feedback monitoring unit 14 also can be divided in digital signal processing unit 11, the second digital down converter 153 and the second digital filter 154 in above-mentioned signal receiving unit 15 also can be divided in digital signal processing unit 11, as shown in Figure 6.
Embodiment tetra-
Signal transmitter based in embodiment mono-, the embodiment of the present invention four provides a kind of method transmitted, and its schematic diagram as shown in Figure 7, said method comprising the steps of:
Step 101: the baseband signal separator is separated into N railway digital baseband signal by the digital baseband signal of input, and exports to respectively N baseband amplitude phase regulator;
Step 102: arbitrary baseband amplitude phase regulator is the setting requirement to amplitude and phase place according to corresponding carrier amplifier or peak amplifier, the digital baseband signal received is carried out to the adjustment of amplitude and phase place, and the digital baseband signal after adjusting is exported to signal conversion unit;
Step 103: signal conversion unit is converted to N road radiofrequency signal by the N railway digital baseband signal of N baseband amplitude phase regulator input, and wherein N-1 road radiofrequency signal is exported to N-1 peak amplifier, and remaining 1 tunnel radiofrequency signal is exported to carrier amplifier, described N-1 road radiofrequency signal is to be converted to by the digital baseband signal after the baseband amplitude phase regulator adjustment corresponding with peak amplifier;
Step 104: carrier amplifier is amplified the radiofrequency signal received, and arbitrary peak amplifier is amplified for the radiofrequency signal to receiving;
Step 105: output after the N road radiofrequency signal after mixer will amplify merges.
Preferably, before the baseband signal separator is separated into N railway digital baseband signal by the digital baseband signal of input, described method also comprises:
Baseband signal peak-to-average force ratio inhibitor is carried out the peak-to-average force ratio inhibition to the digital baseband signal of described input, and the digital baseband signal after the peak-to-average force ratio obtained is suppressed is exported to base band linearisation preprocessor;
Base band linearisation preprocessor carries out the linearisation preliminary treatment to the digital baseband signal received, and the pretreated digital baseband signal of linearisation is exported to the baseband signal separator;
Described baseband signal separator is separated into N railway digital baseband signal by the digital baseband signal of input and is specially:
The baseband signal separator is separated into N railway digital baseband signal by the pretreated digital baseband signal of the linearisation of reception.
Preferably, after baseband signal peak-to-average force ratio inhibitor is carried out the peak-to-average force ratio inhibition to the digital baseband signal of described input, described method also comprises:
Envelop extractor is carried out envelope extraction to the digital baseband signal of baseband signal peak-to-average force ratio inhibitor output, obtains N railway digital baseband envelope signal, and exports to respectively N Initial delay regulator;
Arbitrary Initial delay regulator carries out the time delay adjustment to the digital baseband envelope signal received, and exports to a parameter regulator;
Parameter regulator is according to carrier amplifier or the digital gate voltage signal envelope value of peak amplifier and the corresponding relation between the signal amplitude value of this locality storage, determine the digital gate voltage signal envelope value corresponding to signal amplitude value of the digital baseband envelope signal received, and the signal amplitude value of adjusting this digital baseband envelope signal is to the described digital gate voltage signal envelope value of determining, and described digital gate voltage signal envelope value is exported to signal conversion unit;
Signal conversion unit is converted to N road simulation grid voltage envelope signal by the N railway digital gate voltage signal envelope value of reception, and wherein N-1 road simulation grid voltage envelope signal is exported to N-1 peak amplifier, remaining 1 tunnel simulation grid voltage envelope signal is exported to carrier amplifier, and described N-1 road analogue envelope signal is that the digital gate voltage signal envelope value of being exported by the parameter regulator corresponding with peak amplifier is converted to;
Carrier amplifier, according to the simulation grid voltage envelope signal received, is amplified the radiofrequency signal received;
Arbitrary peak amplifier, according to the simulation grid voltage envelope signal received, is amplified the radiofrequency signal received.
Preferably, described arbitrary Initial delay regulator carries out the time delay adjustment to the digital baseband envelope signal received, and is specially:
On the signal transmission path of described arbitrary Initial delay regulator according to corresponding baseband amplitude phase regulator place, signal exports from baseband signal peak-to-average force ratio inhibitor the first duration that carrier amplifier that this baseband amplitude phase regulator is corresponding or peak amplifier are gone through to, the digital baseband envelope signal received is carried out to the time delay adjustment, make on the signal transmission path at self place, signal exports from baseband signal peak-to-average force ratio inhibitor the second duration that carrier amplifier or peak amplifier go through to and equals described the first duration, a described N Initial delay regulator is corresponding one by one with N baseband amplitude phase regulator.
Preferably, described method also comprises:
The radiofrequency signal coupling that coupler receives mixer output exports the feedback monitoring unit to;
The feedback monitoring unit is processed the radiofrequency signal received, and obtains digital baseband signal and exports to base band linearisation preprocessor;
Base band linearisation preprocessor compares the digital baseband signal of the digital baseband signal of baseband signal peak-to-average force ratio inhibitor output and the output of feedback monitoring unit, adjust the pretreatment parameter of self according to comparative result, and the digital baseband signal of baseband signal peak-to-average force ratio inhibitor being exported again according to the pretreatment parameter after adjusting carries out the linearisation preliminary treatment.
Preferably, described feedback monitoring unit is processed and is specially the radiofrequency signal of described coupler output:
The first analog down converter utilizes the first local oscillator to carry out down-converted to the radiofrequency signal of described coupler output, obtains analog if signal and exports to the first analog to digital converter;
The first analog to digital converter carries out analog-to-digital conversion to the analog if signal received, and obtains digital medium-frequency signal and exports to the first digital down converter;
The first digital down converter carries out down-converted to the digital medium-frequency signal received, and obtains digital baseband signal and exports to the first digital filter;
The first digital filter carries out the filtering processing to the digital baseband signal received.
Preferably, described method also comprises:
The signal receiving unit received RF signal, and this radiofrequency signal is processed, obtain digital baseband signal, and export to baseband signal peak-to-average force ratio inhibitor;
Described baseband signal peak-to-average force ratio inhibitor is carried out the peak-to-average force ratio inhibition to the digital baseband signal of described input, is specially:
Described baseband signal peak-to-average force ratio inhibitor is carried out the peak-to-average force ratio inhibition to the digital baseband signal of signal receiving unit output.
Preferably, signal receiving unit is processed and is specially the radiofrequency signal received:
The second analog down converter utilizes the second local oscillator to carry out down-converted to the radiofrequency signal of described coupler output, obtains analog if signal and exports to the second analog to digital converter;
The second analog to digital converter carries out analog-to-digital conversion to the analog if signal received, and obtains digital medium-frequency signal and exports to the second digital down converter;
The second digital down converter carries out down-converted to the digital medium-frequency signal received, and obtains digital baseband signal and exports to the second digital filter;
The second digital filter carries out the filtering processing to the digital baseband signal received.
Embodiment five
The embodiment of the present invention five be take N and is got 3 as example, and the operation principle of the signal transmitter that relates in the embodiment of the present invention three is elaborated:
Step 1: the radiofrequency signal of extraneous input, after antenna reception, enters the transmitter receiving terminal, and these signals can be the existing standard different frequency range radiofrequency signals such as WCDMA, CDMA/CDMA2000, TD-SCDMA, WiMax, GSM, LTE.
Step 2: in step 1, radiofrequency signal is after the second local oscillator 120 and the second analog down converter 150 actings in conjunction, export an analog if signal, the frequency of this analog if signal can be determined according to the real system parameter, and in the present invention, this frequency of design is 150MHz.During specific implementation, the second analog down converter 150 can adopt the special I of ADI, TI or RFMD company/Q quadrature demodulator or frequency mixer to realize, the second local oscillator 120 can adopt special-purpose phase-locked loop device to realize, in the present invention, adopt the HMC39X family device of RFMD company to realize the second analog down converter 150, the LMX253X family device of TI company is realized the second local oscillator 120.
Step 3: the analog if signal in step 2, theory based on software radio, select analog to digital converter 152 devices, determine its sample rate, be decided to be per second sampling 20,000 ten thousand times in the present invention, also be 20MSPS (Million Samples per Second, MSPS), the intermediate-freuqncy signal of 150MHz, become digital medium-frequency signal after analog to digital converter 152, analog to digital converter 152 can adopt TI, ADI, NXP or Linear company special chip to realize, in the present invention, adopts the ADI chip to realize.
Step 4: the digital medium-frequency signal in step 3 enters the second Digital Down Convert 153 and the second digital filter 154, the second Digital Down Convert determines that according to the sample rate of the IF-FRE numerical value in step 2 and the analog to digital converter 152 in step 3 the numerically controlled oscillator value in Digital Down Convert is 50MHz, and adopt 2 times to extract the drop data rate processing, after the filtering processing capacity filters image spectra, the zero intermediate frequency digital baseband signal that output data rate is 100MSPS is also digital baseband signal.This part specific implementation can adopt special-purpose Digital Down Convert and the design of filtering process chip or adopt field programmable logic device (FPGA) to realize, in the present invention, adopts FPGA to realize.
Step 5: the digital baseband signal data rate obtained from step 4 is 100MSPS, it enters baseband signal peak-to-average force ratio inhibitor 111, after processing by Restrainable algorithms, through the operation of 2X interpolation, become peak-to-average force ratio and reduce the digital baseband signal that data rate is 200MSPS, be beneficial to the design that the rear class high efficiency is amplified.During this part specific implementation, can adopt special-purpose peak-to-average force ratio to suppress chip, as the special chip of TI, PMC and OPTICHRON company or adopt FPGA to realize this function, in the present invention, adopt FPGA to realize.
Step 6: the digital baseband signal in step 5 after the peak-to-average force ratio reduction enters base band linearisation preprocessor 112 and carries out base band linearisation preliminary treatment, by structure and the realization to final-stage power amplifier (carrier amplifier, peak amplifier) model, complete the predistortion to inputting digital baseband signal and output to next stage.During this part specific implementation, can adopt DSP or FPGA to realize, in the present invention, adopt FPGA to realize.
Step 7: the pretreated digital baseband signal of step 6 neutral lineization, enter baseband signal separator 114, baseband signal separator 114 is according to the distribution principle of a decile three, one railway digital baseband signal signal is become to the same digital baseband signal of three tunnel characteristics that amplitude equates, phase place is consistent, will guarantee that the signal peak-to-average ratio after three tunnels are distributed does not change, and data rate remains on 200MSPS simultaneously.During specific implementation, can adopt FPGA to realize.
Step 8: digital baseband signal Zhong De mono-tunnel in step 7 after three tunnels distribution is through baseband amplitude phase regulator 121, requirement according to 521 pairs of input radio frequency signal amplitudes of rear class carrier amplifier and phase place, by in base band domain, corresponding amplitude and the phase value of adjusting this railway digital baseband signal, the amplitude that it is showed in radio frequency domains and phase property are applicable to rear class carrier amplifier 521, thereby reach best performance.During specific implementation, in order reaching, this railway digital signal amplitude and phase place to be controlled more accurately, in the present invention, to be adopted FPGA to control respectively I, the Q two-way of this railway digital signal.
Step 9: another road in the digital baseband signal in step 7 after three tunnels distribution is through baseband amplitude phase regulator 122, requirement according to 522 pairs of input radio frequency signal amplitudes of rear class peak amplifier and phase place, by in base band domain, corresponding amplitude and the phase value of adjusting this railway digital signal, the amplitude that it is showed in radio frequency domains and phase property are applicable to rear class peak amplifier 522, thereby reach best performance.During specific implementation, in order reaching, this railway digital signal amplitude and phase place to be controlled more accurately, in the present invention, to be adopted FPGA to control respectively I, the Q two-way of this railway digital signal;
Step 10: last road in the digital signal in step 7 after three tunnels distribution adjusts 123 through baseband amplitude phase place, requirement according to 523 pairs of input radio frequency signal amplitudes of rear class peak amplifier and phase place, by in base band domain, corresponding amplitude and the phase value of adjusting this railway digital signal, the amplitude that it is showed in radio frequency domains and phase property are applicable to rear class peak amplifier 523, thereby reach best performance.During specific implementation, in order reaching, this railway digital signal amplitude and phase place to be controlled more accurately, in the present invention, to be adopted FPGA to control respectively I, the Q two-way of this railway digital signal.
Step 11: step 8, step 9 and the step 10Zhong tri-tunnels digital signal base-band signal after digital amplitude and phase place adjustment, respectively by digital to analog converter 221, digital to analog converter 222 and digital to analog converter 223, speed according to the input data, select the digital to analog converter clock frequency, thereby complete the conversion of digital signal to analog signal, output Analog Baseband i/q signal or the Simulation with I/Q signal with certain IF-FRE.During specific implementation, input data rate is 20MSPS, and the digital-to-analogue conversion clock frequency has also adopted 200MSPS, and IF-FRE has adopted 150MHz, and device can select the special chip of ADI or TI to realize, in the present invention, adopts the ADI device to realize.
Step 12: three road intermediate frequency Simulation with I, Q signal that step 11 medium frequency is 150MHz, pass through respectively upconverter 321, upconverter 322, upconverter 323, and and the 3rd local oscillator 120 actings in conjunction after, become the radiofrequency signal that amplitude is different with phase place.During specific implementation, upconverter 321, upconverter 322 and up-conversion 323 can adopt the special I of ADI, TI or RFMD company/Q quadrature modulator or frequency mixer to realize, the 3rd local oscillator 120 can adopt special-purpose phase-locked loop device to realize, in the present invention, adopt the ADL537X family device of ADI company to realize up-conversion, the LMX253X family device of TI company is realized the 3rd local oscillator 120.
Two-way radiofrequency signal in step 13: step 12Zhong tri-tunnel radiofrequency signals, process promotes a level amplifier 422, peak amplifier 522 and promotes level amplification 423, peak amplifier 523 respectively, when this two-way radiofrequency signal performance number increases, open successively peak amplifier 522 and peak amplifier 523, whole transmitter peak power output is progressively improved, and guarantee that peak amplifier 522 and peak amplifier 523 all are operated in C class state.During specific implementation, promotion level amplifier 422 in this step, promotion level amplifier 423 and peak amplifier 522, peak amplifier 523, can adopt the power tube devices such as LDMOS, GaN of Freescale or NXP to realize, in the present invention, adopt the LDMOS device of NXP to realize.
Step 14: step 12Zhong tri-tunnel radiofrequency signal Zhong De mono-tunnel radiofrequency signals, through promoting level amplification 421, carrier amplifier 521, after high efficiency is amplified, again through 1/4 wavelength transmission line 131, become the radiofrequency signal after efficient power amplification, and guarantee that carrier amplifier 521 is operated in AB class state.During specific implementation, the amplification 421 of promotion level and carrier amplifier 521 in this step, can adopt the power tube devices such as LDMOS, GaN of Freescale or NXP to realize, in the present invention, adopt the LDMOS device of NXP to realize, 1/4 wavelength transmission line adopts microstrip design.
Step 15: the digital baseband signal that the peak-to-average force ratio in step 5 reduces, enter envelop extractor, obtain the digital baseband envelope signal, after Initial delay regulator 621, Initial delay regulator 622, Initial delay regulator 623, make this digital baseband envelope signal become the digital baseband envelope signal that the time relatively lags behind respectively.During specific implementation, envelope extraction can adopt FPGA in base band domain, based on formula
Wherein ENV means the envelope signal extracted, and I, Q mean respectively base band homophase and orthogonal signalling, and the time delay adjustment adopts high-precision digital dock to realize.
Step 16: the digital baseband envelope signal that in step 14, the time relatively lags behind, its range value is after rounding calculating, the integer value obtained is as the address value of parameter regulator 721, parameter regulator 722 and parameter regulator 723, and correspondence is taken out respectively in parameter regulator 721, parameter regulator 722 and parameter regulator 723 the digital gate voltage signal envelope value of having kept.During specific implementation, in parameter regulator 721, pre-deposit according to pre-depositing in the corresponding relation between the digital gate voltage signal envelope value of input signal envelope amplitude value and carrier amplifier 521, parameter regulator 722 according to pre-depositing according to the corresponding relation between the digital gate voltage signal envelope value of input signal envelope amplitude value and peak amplifier 523 in the corresponding relation between the digital gate voltage signal envelope value of input signal envelope amplitude value and peak amplifier 522, parameter regulator 723.Set digital gate voltage signal envelope value size, parameter regulator 721 determines that principle is at each specific input signal envelope amplitude value place, by adjusting the grid voltage value of carrier amplifier 521, make the transmitter can be in the situation that keep gain substantially constant, it is the highest that efficiency reaches.Parameter regulator 722 determines that principle is by adjusting the grid voltage value of peak amplifier 522 at each specific input signal envelope amplitude value place, make the transmitter can be in the situation that keep most effective, it is optimum that linearity reaches, parameter regulator 723 determines that principle is by adjusting peak amplifier 523 grid voltage values at each specific input signal envelope value place, make the transmitter can be in the situation that keep most effective, linear and power output reaches optimum, what the parameter regulator in this part was realized is the function of look-up table, this part rounds calculating and lookup table technology all realizes in FPGA inside.
Step 17: the three railway digital gate voltage signal envelope value that obtain in step 16 are respectively after digital to analog converter 821, digital to analog converter 822 and digital to analog converter 823, become three tunnel simulation grid voltage envelope signals, complete the conversion of digital gate voltage signal envelope value (being also digital gate voltage signal) from the digital signal to the analog signal.During specific implementation, digital to analog converter 821, digital to analog converter 822 and digital to analog converter 823 can adopt TI, ADI, NXP or Linear company special chip to realize, in the present invention, adopt the ADI chip to realize.
Step 18: the three tunnel simulation grid voltage envelope signals that obtain from step 17, pass through respectively carrier amplifier grid voltage controller 921, peak amplifier grid voltage controller 922 and peak amplifier grid voltage controller 923, the filtering high-frequency interferencing signal, and become the grid voltage value that is applicable to carrier amplifier 521, peak amplifier 522 and peak amplifier 523 normal operations after amplifying.During specific implementation, carrier amplifier is controlled and peak amplifier control is all to be core devices by the long-pending amplifier device of at a high speed large Time Bandwidth, mixes peripheral LC device and realizes, the long-pending amplifier device of the large Time Bandwidth of high speed selects the ADI chip to realize here.
Step 19: in step 13 output the two-way radiofrequency signal and step 14 in output a road radiofrequency signal, through three-in-one close road after, become a road radiofrequency signal.During specific implementation, three-in-one function can adopt Special combiner and microstrip line to realize, in the present invention, can adopt microstrip design.
Step 20: the radiofrequency signal behind step 19Zhong He road, after 1/4 wavelength impedance transformation, becomes the radiofrequency signal output of coupling rear class load impedance feature.During specific implementation, adopt microstrip design 1/4 wavelength impedance transformation function in the present invention.
Step 21: radio frequency output signal in step 20, through the coupler of radio-frequency (RF) output end, extract a part of signal as the feedback radiofrequency signal.During specific implementation, coupler generally adopts 3dB electric bridge or microstrip design, adopts microstrip design in the present invention, and the size of concrete coupling value is determined according to the power of transmitter output.
Step 22: the feedback radiofrequency signal be coupled out in step 21, through the first analog down converter 140 and the first local oscillator 141, after acting in conjunction, make to feed back radiofrequency signal and become an analog if signal, the frequency of this analog if signal can be determined according to the real system parameter, and in the present invention, this frequency of design is 150MHz.During specific implementation, the first analog down converter 140 can adopt the special I of ADI, TI or RFMD company/Q quadrature demodulator or frequency mixer to realize, the first local oscillator 141 can adopt special-purpose phase-locked loop device to realize, in the present invention, adopt the ADL580X family device of ADI company to realize the first analog down converter 140, the LMX253X family device of TI company is realized the first local oscillator 141.
Step 23: the analog if signal that step 22 medium frequency is 150MHz, theory based on software radio, select modulus switching device, determine its sample rate, be decided to be 200MSPS in the present invention, the intermediate-freuqncy signal of 150MHz, after analog to digital converter 142, become digital signal, analog to digital converter 142 can adopt TI, ADI, NXP or Linear company special chip to realize, in the present invention, adopts the ADI chip to realize.
Step 24: the digital signal in step 23 enters the first digital down converter 143 and the first digital filter processor 144, the Digital Down Convert function determines that according to the sample rate of the IF-FRE numerical value in step 22 and the analog to digital converter 142 in step 24 the numerically controlled oscillator value in Digital Down Convert is 50MHz, after the filtering processing capacity filters the image spectra after down-conversion, the digital baseband signal that output data rate is 200MSPS.This part specific implementation can adopt special-purpose Digital Down Convert and the design of filtering process chip or adopt field programmable logic device (FPGA) to realize, in the present invention, adopts FPGA to realize;
Step 25: the digital baseband signal that the speed in step 24 is 200MSPS, enter base band linearisation preprocessor 112, reduce difference between the digital baseband signal that data rate is 200MSPS based on peak-to-average force ratio in this digital baseband signal and step 5, set-up procedure 6 intermediate power amplifier model parameters, also adjust the pretreatment parameter of base band linearisation preprocessor, self adaptation realizes the purpose of transmitter linearization, thereby, when transmitter in the present invention is amplified the radio-frequency input signals high efficiency, also keep the linear index of transmitter.
Also need the several key points that guarantee in concrete enforcement:
(1) guarantee that the work clock of 12 parts such as the first local oscillator 141, analog to digital converter 142, the 3rd local oscillator 120, digital to analog converter 221, digital to analog converter 222, digital to analog converter 223, digital to analog converter 821, digital to analog converter 822, digital to analog converter 826, the second local oscillator 151, analog to digital converter 152 and digital signal processing unit is from same clock source;
(2) when the phase place in step 8, step 9 and step 10 is adjusted, must at first adjust amplitude and phase value in step 8, step 9 and step 10, according to the systematic function performance, realize flexible adjustment;
(3) first local oscillators 141, the second local oscillator 151 and the 3rd local oscillator 120 can be used same local oscillator according to the requirement of systematic function, further save cost and volume;
(4), during the digital signal processing unit specific implementation, can adopt a DSP or fpga chip to realize;
(5) power ratio between the carrier amplifier 521 of power amplification unit, peak amplifier 522, peak amplifier 523 can be equal power, can be also unequal power.And, by the digital signal processing unit setting, make carrier amplifier be operated in AB class state, and peak amplifier 1 and peak amplifier 2 are operated in C class state.
The method of the signal transmitter that the embodiment of the present invention provides and signal emission, having overcome existing transmitter architecture can not optimization system linearity and efficiency and the poor shortcoming of consistency.Theory based on software radio and envelop following technology, grid voltage value size by real-time power ratio control amplifier and maximize the radio-frequency performance digitlization that realizes transmitter, not only make efficiency and the linearity of transmitter reach optimum, improved system conformance simultaneously, the minimum human debug time, not only meet in the existing communication network high linear requirement, simultaneously higher efficiency is significant to the development trend of future communications device miniaturization, portability and environmental protection, the aspect such as energy-conservation.Therefore, the method for the signal transmitter that the embodiment of the present invention provides and signal emission, in the construction of communication network, has boundless application prospect.
Obviously, those skilled in the art can carry out various changes and modification and not break away from the spirit and scope of the present invention the present invention.Like this, if within of the present invention these are revised and modification belongs to the scope of the claims in the present invention and equivalent technologies thereof, the present invention also is intended to comprise these changes and modification interior.
Claims (12)
1. a signal transmitter, is characterized in that, described signal transmitter comprises: digital signal processing unit, signal conversion unit and power amplification unit;
Described digital signal processing unit comprises: baseband signal separator and N the described N of baseband amplitude phase regulator is greater than 1 positive integer;
Described power amplification unit comprises: mixer, 1 carrier amplifier and N-1 peak amplifier, wherein, N-1 baseband amplitude phase regulator is corresponding one by one with a described N-1 peak amplifier, and remaining 1 baseband amplitude phase regulator is corresponding with described carrier amplifier;
Described baseband signal separator, be separated into N railway digital baseband signal for the digital baseband signal by input, and export to respectively N baseband amplitude phase regulator;
Arbitrary baseband amplitude phase regulator, for the setting requirement to amplitude and phase place according to corresponding carrier amplifier or peak amplifier, the digital baseband signal received is carried out to the adjustment of amplitude and phase place, and the digital baseband signal after adjusting is exported to signal conversion unit;
Described signal conversion unit, be converted to N road radiofrequency signal for the N railway digital baseband signal by N baseband amplitude phase regulator input, and wherein N-1 road radiofrequency signal is exported to N-1 peak amplifier, remaining 1 tunnel radiofrequency signal is exported to carrier amplifier, and described N-1 road radiofrequency signal is to be converted to by the digital baseband signal after the baseband amplitude phase regulator adjustment corresponding with peak amplifier;
Described carrier amplifier, amplified for the radiofrequency signal to receiving, and this carrier amplifier is operated in the AB class simultaneously;
Arbitrary peak amplifier, amplified for the radiofrequency signal to receiving, and this peak amplifier is operated in the C class simultaneously;
Described mixer, output after merging for the N road radiofrequency signal after amplifying.
2. signal transmitter as claimed in claim 1, is characterized in that, described digital signal processing unit also comprises: baseband signal peak-to-average force ratio inhibitor and base band linearisation preprocessor;
Described baseband signal peak-to-average force ratio inhibitor, carry out the peak-to-average force ratio inhibition for the digital baseband signal to described input, and the digital baseband signal after the peak-to-average force ratio obtained is suppressed is exported to base band linearisation preprocessor;
Described base band linearisation preprocessor, carry out the linearisation preliminary treatment for the digital baseband signal to receiving, and the pretreated digital baseband signal of linearisation exported to the baseband signal separator.
3. signal transmitter as claimed in claim 2, it is characterized in that, described digital signal processing unit also comprises: envelop extractor, a N Initial delay regulator, a N parameter regulator, wherein, N-1 parameter regulator is corresponding one by one with N-1 peak amplifier, and remaining 1 parameter regulator is corresponding with carrier amplifier;
Described envelop extractor, carry out envelope extraction for the digital baseband signal to the output of baseband signal peak-to-average force ratio inhibitor, obtains N railway digital baseband envelope signal, and export to respectively N Initial delay regulator;
Arbitrary Initial delay regulator, carry out the time delay adjustment for the digital baseband envelope signal to receiving, and export to a parameter regulator;
Arbitrary parameter regulator, for carrier amplifier or the digital gate voltage signal envelope value of peak amplifier and the corresponding relation between the signal amplitude value according to this locality storage, determine the digital gate voltage signal envelope value corresponding to signal amplitude value of the digital baseband envelope signal received, and described digital gate voltage signal envelope value is exported to signal conversion unit;
Described signal conversion unit, also for the N railway digital gate voltage signal envelope value by reception, be converted to N road simulation grid voltage envelope signal, and wherein N-1 road simulation grid voltage envelope signal is exported to N-1 peak amplifier, remaining 1 tunnel simulation grid voltage envelope signal is exported to carrier amplifier, and described N-1 road simulation grid voltage envelope signal is that the digital gate voltage signal envelope value of being exported by the parameter regulator corresponding with peak amplifier is converted to;
Described carrier amplifier, specifically for the simulation grid voltage envelope signal according to receiving, amplified the radiofrequency signal received;
Arbitrary peak amplifier, specifically for the simulation grid voltage envelope signal according to receiving, amplified the radiofrequency signal received.
4. signal transmitter as claimed in claim 3, is characterized in that, a described N Initial delay regulator is corresponding one by one with N baseband amplitude phase regulator;
Described arbitrary Initial delay regulator, on signal transmission path specifically for the baseband amplitude phase regulator place according to corresponding, signal exports from baseband signal peak-to-average force ratio inhibitor the first duration that carrier amplifier that this baseband amplitude phase regulator is corresponding or peak amplifier are gone through to, the digital baseband envelope signal received is carried out to the time delay adjustment, make on the signal transmission path at self place, signal exports from baseband signal peak-to-average force ratio inhibitor the second duration that carrier amplifier or peak amplifier go through to and equals described the first duration.
5. described signal transmitter as arbitrary as claim 2-4, is characterized in that, described power amplification unit also comprises: coupler;
Described signal transmitter also comprises: the feedback monitoring unit;
Described coupler, export the feedback monitoring unit to for the radiofrequency signal coupling by described mixer output;
The feedback monitoring unit, processed for the radiofrequency signal to receiving, and obtains digital baseband signal and export to base band linearisation preprocessor;
Described base band linearisation preprocessor, digital baseband signal specifically for the digital baseband signal by the output of baseband signal peak-to-average force ratio inhibitor and the output of feedback monitoring unit compares, adjust the pretreatment parameter of self according to comparative result, and the digital baseband signal of baseband signal peak-to-average force ratio inhibitor being exported again according to the pretreatment parameter after adjusting carries out the linearisation preliminary treatment.
6. signal transmitter as claimed in claim 2, is characterized in that, described signal transmitter also comprises:
Signal receiving unit, for received RF signal, and processed this radiofrequency signal, obtains digital baseband signal, and export to baseband signal peak-to-average force ratio inhibitor.
7. a method of utilizing signal transmitter claimed in claim 1 to transmit, is characterized in that, described method comprises:
The baseband signal separator is separated into N railway digital baseband signal by the digital baseband signal of input, and exports to respectively N baseband amplitude phase regulator;
Arbitrary baseband amplitude phase regulator is the setting requirement to amplitude and phase place according to corresponding carrier amplifier or peak amplifier, the digital baseband signal received is carried out to the adjustment of amplitude and phase place, and the digital baseband signal after adjusting is exported to signal conversion unit;
Signal conversion unit is converted to N road radiofrequency signal by the N railway digital baseband signal of N baseband amplitude phase regulator input, and wherein N-1 road radiofrequency signal is exported to N-1 peak amplifier, and remaining 1 tunnel radiofrequency signal is exported to carrier amplifier, described N-1 road radiofrequency signal is to be converted to by the digital baseband signal after the baseband amplitude phase regulator adjustment corresponding with peak amplifier;
After carrier amplifier and arbitrary peak amplifier are amplified the radiofrequency signal received separately, output after the N road radiofrequency signal after amplifying by mixer merges.
8. the method transmitted as claimed in claim 7, is characterized in that, before the baseband signal separator is separated into N railway digital baseband signal by the digital baseband signal of input, described method also comprises:
Baseband signal peak-to-average force ratio inhibitor is carried out the peak-to-average force ratio inhibition to the digital baseband signal of described input, and the digital baseband signal after the peak-to-average force ratio obtained is suppressed is exported to base band linearisation preprocessor;
Base band linearisation preprocessor carries out the linearisation preliminary treatment to the digital baseband signal received, and the pretreated digital baseband signal of linearisation is exported to the baseband signal separator;
Described baseband signal separator is separated into N railway digital baseband signal by the digital baseband signal of input and is specially:
The baseband signal separator is separated into N railway digital baseband signal by the pretreated digital baseband signal of the linearisation of reception.
9. the method transmitted as claimed in claim 8, is characterized in that, after baseband signal peak-to-average force ratio inhibitor is carried out the peak-to-average force ratio inhibition to the digital baseband signal of described input, described method also comprises:
Envelop extractor is carried out envelope extraction to the digital baseband signal of baseband signal peak-to-average force ratio inhibitor output, obtains N railway digital baseband envelope signal, and exports to respectively N Initial delay regulator;
Arbitrary Initial delay regulator carries out the time delay adjustment to the digital baseband envelope signal received, and exports to a parameter regulator;
Parameter regulator is according to carrier amplifier or the digital gate voltage signal envelope value of peak amplifier and the corresponding relation between the signal amplitude value of this locality storage, determine the digital gate voltage signal envelope value corresponding to signal amplitude value of the digital baseband envelope signal received, and described digital gate voltage signal envelope value is exported to signal conversion unit;
The N railway digital gate voltage signal envelope value that signal conversion unit sends N parameter regulator is converted to N road simulation grid voltage envelope signal, and wherein N-1 road simulation grid voltage envelope signal is exported to N-1 peak amplifier, remaining 1 tunnel simulation grid voltage envelope signal is exported to carrier amplifier, and described N-1 road simulation grid voltage envelope signal is that the digital gate voltage signal envelope value of being exported by the parameter regulator corresponding with peak amplifier is converted to;
Carrier amplifier and arbitrary peak amplifier, according to the simulation grid voltage envelope signal received separately, are amplified the radiofrequency signal received.
10. the method transmitted as claimed in claim 9, is characterized in that, described arbitrary Initial delay regulator carries out the time delay adjustment to the digital baseband envelope signal received, and is specially:
On the signal transmission path of described arbitrary Initial delay regulator according to corresponding baseband amplitude phase regulator place, signal exports from baseband signal peak-to-average force ratio inhibitor the first duration that carrier amplifier that this baseband amplitude phase regulator is corresponding or peak amplifier are gone through to, the digital baseband envelope signal received is carried out to the time delay adjustment, make on the signal transmission path at self place, signal exports from baseband signal peak-to-average force ratio inhibitor the second duration that carrier amplifier or peak amplifier go through to and equals described the first duration, a described N Initial delay regulator is corresponding one by one with N baseband amplitude phase regulator.
11. the described method transmitted as arbitrary as claim 8-10, is characterized in that, described method also comprises:
Coupler exports the radiofrequency signal coupling of described mixer output to the feedback monitoring unit;
The feedback monitoring unit is processed the radiofrequency signal received, and obtains digital baseband signal and exports to base band linearisation preprocessor;
Base band linearisation preprocessor compares the digital baseband signal of the digital baseband signal of baseband signal peak-to-average force ratio inhibitor output and the output of feedback monitoring unit, adjust the pretreatment parameter of self according to comparative result, and the digital baseband signal of baseband signal peak-to-average force ratio inhibitor being exported again according to the pretreatment parameter after adjusting carries out the linearisation preliminary treatment.
12. the method transmitted as claimed in claim 8, is characterized in that, described method also comprises:
The signal receiving unit received RF signal, and this radiofrequency signal is processed, obtain digital baseband signal, and export to baseband signal peak-to-average force ratio inhibitor;
Described baseband signal peak-to-average force ratio inhibitor is carried out the peak-to-average force ratio inhibition to the digital baseband signal of described input, is specially:
Described baseband signal peak-to-average force ratio inhibitor is carried out the peak-to-average force ratio inhibition to the digital baseband signal of signal receiving unit output.
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| CN107517409A (en) * | 2017-07-27 | 2017-12-26 | 西安空间无线电技术研究所 | A kind of navigation locating method based on direct broadcasting satellite |
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| CN111654243B (en) * | 2019-03-04 | 2023-03-03 | 华为技术有限公司 | Power amplification device, beam forming system, transmitter and base station |
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