CN101022434A - Predistorting device and method - Google Patents
Predistorting device and method Download PDFInfo
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- CN101022434A CN101022434A CNA2007100736782A CN200710073678A CN101022434A CN 101022434 A CN101022434 A CN 101022434A CN A2007100736782 A CNA2007100736782 A CN A2007100736782A CN 200710073678 A CN200710073678 A CN 200710073678A CN 101022434 A CN101022434 A CN 101022434A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/36—Modulator circuits; Transmitter circuits
- H04L27/366—Arrangements for compensating undesirable properties of the transmission path between the modulator and the demodulator
- H04L27/367—Arrangements for compensating undesirable properties of the transmission path between the modulator and the demodulator using predistortion
- H04L27/368—Arrangements for compensating undesirable properties of the transmission path between the modulator and the demodulator using predistortion adaptive predistortion
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/32—Modifications of amplifiers to reduce non-linear distortion
- H03F1/3241—Modifications of amplifiers to reduce non-linear distortion using predistortion circuits
- H03F1/3247—Modifications of amplifiers to reduce non-linear distortion using predistortion circuits using feedback acting on predistortion circuits
Abstract
A pre-distorting method deducts pre-distortion coefficient of feedback channel in pre-distortion coefficient obtained by existing technique to make pre-distortion treatment of input signal be distortion complete complementation of emission channel for raising accuracy of pre-distortion.
Description
Technical field
The present invention relates to communication technical field, particularly a kind of pre-distortion device and method.
Background technology
So far, worked out multiple to the power amplifier (PowerAmplifier in the transmitter in the mobile communication system, PA) carry out linearizing technology, wherein major technology has feedforward and pre-distortion technology. and the forward feed forward approach is widely-used, yet this method stability is bad, and equipment is very complicated.Therefore pre-distortion technology becomes power amplifier is carried out linearizing desirable technique.
As shown in Figure 1, currently used pre-distortion technology is exactly to carry out predistortion earlier to transmitting, contain the distortion of power amplifier with compensation at interior transmission channel, so ideally identical through the preceding signal of the signal that obtains behind the power amplifier and predistortion.This requires predistortion to be and contains the distortion fully complementation of power amplifier at interior transmission channel, so need measure to the output signal of power amplifier, from these signals, extract pre-distortion coefficients by certain algorithm again, be used for carrying out pre-distortion transmitting.In the transmitter that uses pre-distortion technology, a feedback path that contains feedback receiver is arranged in order to extract pre-distortion coefficients.Feedback path has error, comprises the unevenness of amplitude-frequency response and phase-frequency response, and non-linear etc.The hypothesis feedback path is desirable in the prior art, these error converting of feedback path have arrived in the transmission channel characteristic as a result, the error that causes the pre-distortion coefficients extracted, the distortion of whole transmission channel can not just in time be compensated by pre-distortion, make the preceding baseband signal of PA output signal and predistortion produce difference, real distortion promptly takes place.
Summary of the invention
The embodiment of the invention provides a kind of pre-distortion method and device, can improve the precision of pre-distortion technology.
For this reason, the embodiment of the invention provides following technical scheme:
The invention provides a kind of pre-distortion device, comprise pre-distortion unit, transmission channel, pre-distortion coefficients computing unit, feedback path, signal source, feedback path correcting unit;
Wherein the pre-distortion unit is used for according to pre-distortion coefficients input signal being carried out pre-distortion;
The conversion of signals that transmission channel is used for the output of described pre-distortion unit is the high-power RF signal;
Feedback path is used to obtain the part signal of described transmission channel output;
Signal source is used to produce test signal, sends to described feedback path;
The feedback path correcting unit is used for obtaining the distortion factor of described feedback path according to described test signal and through the test signal behind the described feedback path;
The pre-distortion coefficients computing unit is used for producing pre-distortion coefficients and sending to described pre-distortion unit according to the signal of the described feedback path output of part signal process of described input signal and the output of described transmission channel and the distortion factor of described feedback path.
The present invention also provides a kind of pre-distortion method, may further comprise the steps: according to pre-distortion coefficients, make the input signal predistortion; Input signal after the predistortion is converted to radiofrequency signal through transmission channel, the part radiofrequency signal is coupled in the feedback path, according to described input signal and the radiofrequency signal by feedback path, obtain pre-distortion coefficients, it is characterized in that, further comprise: obtain the feedback path pre-distortion coefficients, deduction feedback path pre-distortion coefficients from the pre-distortion coefficients that obtains according to input signal and the radiofrequency signal by feedback path, the pre-distortion coefficients after this deduction feedback path pre-distortion coefficients is used to make described input signal predistortion.
The technical scheme that provides by the above embodiment of the invention as seen, the embodiment of the invention is considered the distorted characteristic of feedback path when calculating pre-distortion coefficients, so the pre-distortion coefficients that provides is more accurate, the real predistortion that realizes transmission channel.
Description of drawings
Fig. 1 is the structure chart of existing pre-distortion device;
Fig. 2 is pre-distortion device example structure figure of the present invention;
Fig. 3 is the detailed structure view one of embodiment of the invention pre-distortion unit;
Fig. 4 is the detailed structure view two of embodiment of the invention pre-distortion unit;
Fig. 5 is the detailed structure view three of embodiment of the invention pre-distortion unit;
Fig. 6 is the detailed structure view of embodiment of the invention feedback path;
Fig. 7 is the detailed structure view one of embodiment of the invention isolation network;
Fig. 8 is the detailed structure view two of embodiment of the invention isolation network;
Fig. 9 is the detailed structure view three of embodiment of the invention isolation network;
Figure 10 is the detailed structure view four of embodiment of the invention isolation network.
Embodiment
The embodiment of the invention mainly is by obtaining the imperfection of feedback path, the influence of the imperfection of deduction feedback path when calculating pre-distortion coefficients, make pre-distortion coefficients a imperfection corresponding to transmission channel, and irrelevant, thereby the distortion of whole transmission channel is just in time compensated by pre-distortion with the imperfection of feedback path.
In order to make those skilled in the art person understand the present invention program better, now embodiments of the invention are described referring to accompanying drawing.At first illustrate, comprise power amplifier and can be expressed as y (t)=f (x (t)) with an expression formula at interior transmission channel, x (t) is the transmission channel input signal, t is the time, y (t) is transmission channel output, f is a nonlinear function that contains memory effect, i.e. Volterra progression is used as and comprises the model of power amplifier at interior transmission channel.Be treated to g (x (t)) and the pre-distortion unit does, g also is a nonlinear function with memory effect, promptly also is a kind of Volterra progression, and g has following character: f (g (x (t)))=x (t).The pre-distortion coefficients computing unit should make the coefficient of g have this character.Make like this and use after the pre-distortion technology output y (the t)=f of transmission channel (g (x (t)))=x (t).Explanation herein only is the follow-up explanation that understanding is carried out to embodiments of the invention.
Be illustrated in figure 2 as the structure chart of pre-distortion device embodiment of the present invention:
Described pre-distortion device comprises pre-distortion unit 201, transmission channel 202, pre-distortion coefficients computing unit 203, feedback path 204, feedback path correcting unit 205, signal source 206, isolation network 207.
Wherein pre-distortion unit 201 is used for baseband signal is carried out pre-distortion, and distortion herein is with the signal change that be reversed of baseband signal towards transmission channel 202 distortions, distortion that like this can compensate for emission passage 202.Baseband signal sends to transmission channel 202 through after the pre-distortion.
Transmission channel 202 is used for the output signal of pre-distortion unit 201 is handled.Transmission channel 202 comprises radio frequency converting unit 21, PA22.Wherein radio frequency converting unit 21 mainly is to carry out processing such as frequency translation, and the input signal of the predistortion that transmission channel 202 is received is converted to radiofrequency signal.PA22 is used for the output signal of radio frequency converting unit 21 is carried out power amplification.Comprise various nonlinear distortions in the transmission channel 202, wherein PA22 is the main source of nonlinear distortion.The output of PA22 has coupler, and the part of the radiofrequency signal after the power amplification is sent to feedback path 204 via isolation network 207.
Signal source 206 is used to produce test signal, sends to feedback path 204 via isolation network 207.
Feedback path 204 is used for carrying out to the received signal processing such as frequency translation, amplification, sampling.Radiofrequency signal obtains sampled signal after handling through feedback path 204, and described sampled signal is sent to pre-distortion coefficients computing unit 203.Test signal is sent to feedback path correcting unit 205 after handling through feedback path 204.
Test signal after feedback path correcting unit 205 is used for more described test signal and handles through feedback path 204 obtains the feedback path pre-distortion coefficients, sends to pre-distortion coefficients computing unit 203.The signal that signal source 206 produces can be a digital signal, described digital signal sends to feedback path correcting unit 205, described digital signal is by built-in high-precision DAC (the Digital AnalogConverter of signal source 206, digital-to-analog converter is called for short digital to analog converter) send in the feedback path 204 after being converted to analog signal; Signal source 206 also can directly produce analog signal, send to feedback path 204, between signal source 206 and feedback path correcting unit 205, insert an ADC (Analog to DigitalConverter, analog-digital converter, be called for short analog to digital converter, the analog signal that signal source 206 produces sends to feedback path correcting unit 205 after being converted to digital signal through ADC; ADC between signal source 206 and feedback path correcting unit 205 also can integrate with feedback path correcting unit 205.Can between feedback path correcting unit 205 and signal source 206, be provided with control interface, feedback path correcting unit 205 can be by control interface control signal source 206 the characteristic of test signal of output, as the form of test signal and power etc., so the signal of the generation of signal source 206 is known for feedback path correcting unit 205, just both can be compared behind the signal of feedback path correcting unit 205 after receiving test signal process feedback path 204, obtain the feedback path pre-distortion coefficients.Feedback path correcting unit 205 also can pass through control interface shutdown signal source, makes its not output signal, avoids interference 204 pairs of radio frequency Signal Processing of feedback path.
Pre-distortion coefficients computing unit 203 is used for described sampled signal and baseband signal are compared, monitor the nonlinear change of whole device, extract the device pre-distortion coefficients, deduction feedback path pre-distortion coefficients wherein, obtain pre-distortion coefficients, send to the 201 pairs of inputs in pre-distortion unit baseband signal and carry out pre-distortion.
Isolation network 207 is used for channel isolation 2,3, and passage 2,3 is not communicated with passage 1 simultaneously.Isolation network 207 is isolated passage 3 when feedback path 204 is handled signal from PA22, promptly stop signal source 206 to feedback path 204 output signals; When the signal in feedback path 204 processing signals sources 206, isolate passage 2, promptly stop PA22 to feedback path 204 output signals.
The operation of 2 couples of pre-distortion device embodiment of the present invention describes with reference to the accompanying drawings:
Wherein pre-distortion unit 201 carries out pre-distortion according to pre-distortion coefficients to baseband signal; The output signal of 202 pairs of pre-distortion unit 201 of transmission channel is handled, and part output signal sends in the feedback path 204 via isolation network 207.Feedback path 204 carries out processing such as mixing, amplification, sampling to the received signal.Feedback path correcting unit 205 is by the characteristics of signals in control interface control signal source 206, as the form of signal, size etc.Signal source 206 produces the test signal of numeral according to control, be converted to the test signal of analog form through the high accuracy DAC of signal source 206 inside, and be converted to after the radiofrequency signal through suitable mixing, filtering and amplification, send to feedback path 204 via isolation network 207.Feedback path correcting unit 205 obtains the feedback path pre-distortion coefficients, and sends it to pre-distortion coefficients computing unit 203 by the test signal of comparison signal source 206 generations and the signal behind the test signal process feedback path 204.The baseband signal that pre-distortion coefficients computing unit 203 is relatively imported and the output signal of feedback path 204, obtain the distortion factor of whole device, therefrom deduct the feedback path pre-distortion coefficients, and then acquisition pre-distortion coefficients, and give pre-distortion unit 201 with pre-distortion coefficients, the input baseband signal is carried out pre-distortion.
By present embodiment as can be seen, because the pre-distortion coefficients that is adopted is corresponding to transmission channel, and not with the distortion of feedback path conversion in the distortion of transmission channel, so the distortion that pre-distortion can the full remuneration transmission channel and can not produce new distortion.
Fig. 3 is the detailed diagram according to the pre-distortion unit 201 of Fig. 2 of apparatus of the present invention embodiment: comprise predistorter 31, be used for according to pre-distortion coefficients respectively to I (Inphase, homophase) road and Q (Quadrature, quadrature) way word input signal carries out pre-distortion; Modulator 32 is used for the output signal of predistorter 31 is modulated to digital medium-frequency signal; DAC33 is used for the digital medium-frequency signal of modulator 32 outputs is converted to analog if signal.
Pre-distortion unit 201 for Fig. 2 is not limited to embodiment shown in Figure 3, can also be according to Fig. 4 and execution mode design shown in Figure 5.Pre-distortion unit shown in Figure 4 comprises: predistorter 41 is used for according to pre-distortion coefficients pre-distortion being carried out on I road and Q way word input signal respectively; DAC42, the I way word conversion of signals that is used for predistorter 41 output is an I road analog signal, and is Q road analog signal with Q way word conversion of signals; Modulator 43 is used for the I road and the Q road analog signal of DAC output are modulated to analog if signal.Pre-distortion unit shown in Figure 5 comprises: modulator 51 is used for I road and Q way word input signal are modulated to digital medium-frequency signal; Predistorter 52 is used for carrying out pre-distortion according to the digital medium-frequency signal that pre-distortion coefficients is exported modulator 51; DAC53, the conversion of signals that is used for predistorter 52 outputs is an analog if signal.
Figure 6 shows that the detailed diagram of feedback path 204 of Fig. 2 of apparatus of the present invention embodiment: comprise feedback receiver 61, be used for the high-power RF signal of receiving is carried out processing such as frequency translation, amplification; Feedback ADC62 is used for that the signal that feedback receiver 61 is exported is carried out analog-to-digital conversion by sampling and becomes digital signal.Signal in these feedback receiver 61 outputs can be an analog if signal, and ADC62 is after receiving analog if signal for feedback, can earlier analog if signal be converted to digital medium-frequency signal, again digital medium-frequency signal is converted to digital baseband signal; Also can earlier analog if signal be converted to analog signal, be digital baseband signal with analog signal conversion again; Can also only carry out analog if signal and be converted to digital medium-frequency signal, digital medium-frequency signal is sent to pre-distortion coefficients computing unit 203, by of the conversion of pre-distortion coefficients computing unit 203 advanced line number word intermediate-freuqncy signals, extract pre-distortion coefficients again to digital baseband signal.
Fig. 7 to Figure 10 is the detailed structure schematic diagram of the isolation network 207 among embodiment of the invention Fig. 2:
Fig. 7 does not have switch, is the simplest a kind of form.Weaken the signal of passage 2 and passage 3 by electronic device 71,72, make both interference reductions.When between feedback path correcting unit 205 and the signal source 206 control interface being arranged, for fear of signal source 206 output signals the feedback path signal is formed interference, feedback path correcting unit 205 can make signal source 206 non-output signals by control interface.
Use a switch 73 among Fig. 8, can when feedback path is extracted the feedback path pre-distortion coefficients, isolate the influence of the signal that the transmission channel coupling comes.Same, in the extraction element pre-distortion coefficients, feedback path correcting unit 205 can by and signal source 206 between control interface shutdown signal source output signal.
Used two switches among Fig. 9, switch 73 and switch 74, control can be more flexible.
Two switches 73 and 74 with Fig. 9 among Figure 10 change a single-pole double throw diverter switch 75 into, and structure is compact more.
Isolation network reduces or avoids the interference of signal source when can make feedback path receive the transmission channel signal in the foregoing description, thereby the precision of the device pre-distortion coefficients that raising pre-distortion coefficients computing unit obtains, and feedback path reduces or avoids the interference of transmission channel output signal when the signal in received signal source, thereby improved the precision of the feedback path pre-distortion coefficients that the feedback path correcting unit obtains, and then improved the precision of whole pre-distortion device.Above-mentioned Fig. 7 to Figure 10 only is several embodiment of isolation network, and those of ordinary skill in the art knows that other isolation networks through distortion do not break away from spirit of the present invention.
Though described the present invention by above embodiment, those of ordinary skills know, the present invention has many distortion and variation and do not break away from spirit of the present invention, wish that appended claim comprises these distortion and variation and do not break away from spirit of the present invention.
Claims (11)
1, a kind of pre-distortion device is characterized in that, comprises pre-distortion unit, transmission channel, pre-distortion coefficients computing unit, feedback path, signal source, feedback path correcting unit;
The pre-distortion unit is used for according to pre-distortion coefficients input signal being carried out pre-distortion;
The conversion of signals that transmission channel is used for the output of described pre-distortion unit is the high-power RF signal;
Feedback path is used to obtain the part signal of described transmission channel output;
Signal source is used to produce test signal, sends to described feedback path;
The feedback path correcting unit is used for obtaining the distortion factor of described feedback path according to described test signal and through the test signal behind the described feedback path;
The pre-distortion coefficients computing unit is used for producing pre-distortion coefficients and sending to described pre-distortion unit according to the signal of the described feedback path output of part signal process of described input signal and the output of described transmission channel and the distortion factor of described feedback path.
2, pre-distortion device according to claim 1, it is characterized in that, further comprise isolation network, be connected, isolate signal source or signal source isolation transmission channel when communicating when being used for transmission channel and communicating with feedback path with feedback path with transmission channel, feedback path, signal source.
3, pre-distortion device according to claim 2 is characterized in that, described isolation network comprises electronic device and/or switch, and described electronic device is one of resistance, electric capacity, inductance, coupler or combination.
4, pre-distortion device according to claim 1, it is characterized in that, be provided with control interface between described feedback path correcting unit and the described signal source, the feedback path correcting unit is by the switch in control interface control signal source and/or the characteristic of signal source output signal.
5, according to each described pre-distortion device of claim 1 to 4, it is characterized in that described transmission channel comprises radio frequency converting unit, power amplifier;
Described radio frequency converting unit is used for the output signal of pre-distortion unit is converted to radiofrequency signal;
Described power amplifier is used for the radiofrequency signal of described radio frequency converting unit output is amplified.
6, according to each described pre-distortion device of claim 1 to 4, it is characterized in that described feedback path comprises analog to digital converter, feedback receiver;
Described feedback receiver is used to receive the part signal of described transmission channel output;
Described analog to digital converter is used for the output signal of described feedback receiver is sampled.
According to each described pre-distortion device of claim 1 to 4, it is characterized in that 7, described pre-distortion unit comprises predistorter, modulator, digital to analog converter:
Described predistorter is used for input signal is carried out pre-distortion; Described modulator is used for the signal of described predistorter output is modulated to intermediate-freuqncy signal; The conversion of signals that described digital to analog converter is used for described modulator output is an analog signal.
According to each described pre-distortion device of claim 1 to 4, it is characterized in that 8, described pre-distortion unit comprises predistorter, modulator, digital to analog converter:
Described modulator is used for input signal is modulated to intermediate-freuqncy signal; Described predistorter is used for the signal of modulator output is carried out pre-distortion; The conversion of signals that described digital to analog converter is used for described predistorter output is an analog signal.
According to each described pre-distortion device of claim 1 to 4, it is characterized in that 9, described pre-distortion unit comprises predistorter, modulator, digital to analog converter:
Described predistorter is used for input signal is carried out pre-distortion; The conversion of signals that described digital to analog converter is used for described predistorter output is an analog signal; Described modulator is used for the signal of digital to analog converter output is modulated to intermediate-freuqncy signal.
10, a kind of pre-distortion method may further comprise the steps: according to pre-distortion coefficients, make the input signal predistortion; Input signal after the predistortion is converted to radiofrequency signal through transmission channel, the part radiofrequency signal is coupled in the feedback path, according to described input signal and the radiofrequency signal by feedback path, obtain pre-distortion coefficients, it is characterized in that, further comprise: obtain the feedback path pre-distortion coefficients, deduction feedback path pre-distortion coefficients from the pre-distortion coefficients that obtains according to input signal and the radiofrequency signal by feedback path, the pre-distortion coefficients after this deduction feedback path pre-distortion coefficients is used to make described input signal predistortion.
11, pre-distortion method according to claim 10 is characterized in that, the described feedback path pre-distortion coefficients of obtaining is: relatively import the signal and the signal of exporting through feedback path of feedback path, obtain the feedback path pre-distortion coefficients.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100736782A CN100556015C (en) | 2007-03-27 | 2007-03-27 | A kind of pre-distortion device and method |
| PCT/CN2008/070269 WO2008116402A1 (en) | 2007-03-27 | 2008-02-03 | The predistortion apparatus, transmitter and the method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100736782A CN100556015C (en) | 2007-03-27 | 2007-03-27 | A kind of pre-distortion device and method |
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| CN101022434A true CN101022434A (en) | 2007-08-22 |
| CN100556015C CN100556015C (en) | 2009-10-28 |
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| CNB2007100736782A Expired - Fee Related CN100556015C (en) | 2007-03-27 | 2007-03-27 | A kind of pre-distortion device and method |
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| WO (1) | WO2008116402A1 (en) |
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| WO2008116402A1 (en) * | 2007-03-27 | 2008-10-02 | Huawei Technologies Co., Ltd. | The predistortion apparatus, transmitter and the method |
| CN102014090A (en) * | 2010-12-13 | 2011-04-13 | 中兴通讯股份有限公司 | Digital predistortion method and device |
| CN101175061B (en) * | 2007-11-30 | 2011-05-04 | 北京北方烽火科技有限公司 | Self-adapting digital predistortion method and apparatus for OFDM transmitter |
| CN102143107A (en) * | 2011-02-25 | 2011-08-03 | 华为技术有限公司 | Method and device for realizing pre-distortion of digital baseband |
| CN102204200A (en) * | 2011-04-18 | 2011-09-28 | 华为技术有限公司 | Digital analog predistortion processing apparatus, signal transmission system and signal transmission method |
| CN102271106A (en) * | 2011-03-29 | 2011-12-07 | 电子科技大学 | Pre-distortion processing method and device |
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| CN103888395A (en) * | 2014-03-04 | 2014-06-25 | 京信通信系统（广州）有限公司 | Digital pre-distortion method and digital pre-distortion device |
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| CN113054919A (en) * | 2021-03-16 | 2021-06-29 | 成都德芯数字科技股份有限公司 | Method, device and equipment for testing digital predistortion signal feedback circuit |
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| CN117527099A (en) * | 2022-07-28 | 2024-02-06 | 中兴通讯股份有限公司 | Performance test method, base station and storage medium of radio frequency transmission channel |
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| CN1185813C (en) * | 2000-08-15 | 2005-01-19 | 华为技术有限公司 | Method and device for testing and correcting the non-linear characteristics of channel |
| JP2002223171A (en) * | 2001-01-29 | 2002-08-09 | Fujitsu Ltd | Nonlinear distortion compensating transmitter correcting and interpolating distortion compensation coefficient |
| KR100546245B1 (en) * | 2003-07-10 | 2006-01-26 | 단암전자통신주식회사 | Apparatus and method for power amplifying using predistortion and radio communication system having the apparatus |
| CN100556015C (en) * | 2007-03-27 | 2009-10-28 | 华为技术有限公司 | A kind of pre-distortion device and method |
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| Publication number | Publication date |
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| WO2008116402A1 (en) | 2008-10-02 |
| CN100556015C (en) | 2009-10-28 |
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