CN100525079C - Method and equipment of simulating predistortion linearization - Google Patents
Method and equipment of simulating predistortion linearization Download PDFInfo
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- CN100525079C CN100525079C CNB2004800442069A CN200480044206A CN100525079C CN 100525079 C CN100525079 C CN 100525079C CN B2004800442069 A CNB2004800442069 A CN B2004800442069A CN 200480044206 A CN200480044206 A CN 200480044206A CN 100525079 C CN100525079 C CN 100525079C
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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
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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
- H03F1/3282—Acting on the phase and the amplitude of the input signal
Abstract
A method of simulating predistortion linearization, includes: adjust the input signal's amplitude, and convert the frequency to the intermediate frequency or low frequency; produce predistortion signal; add the said predistortion signal to the input signal to transmit together, which has been delay matching processed; distortion detect the transmission signal, and adaptation optimize the predistortion signal's amplitude and phase parameter. The invention eliminates non-linearity produced by transmission channel or device by means of producing simulation (3) exponent, (5) exponent, (7) exponent even much higher exponent predistortion signal, and adaptation adjust by the output distortion detection. The invention is easy realizable and producible, and has low cost.
Description
Technical field
The present invention relates to the linearization technique in the communication system, specifically, relate to wherein analog predistortion linear method and device.
Background technology
Along with development of Communication Technique, in order to transmit more information in system, the signal of transmission often has wideer bandwidth, and the amplitude of signal and phase place also all carry information, this can increase the peak-to-average force ratio of signal greatly, thereby makes the nonlinear situation of system more serious.For communication system, these are non-linear to be very harmful as interference, so system need be to the non-linear proposition that produces than higher requirement, to weaken the non-linear influence that brings.
Signal sends by sendaisle and transmitting apparatus, and that these passages and equipment often exist is non-linear, and this non-linear meeting causes the frequency spectrum diffusion of signal, disturbs thereby adjacent neighboring trace produced.And the characteristics of communication system signal are that bandwidth is wide, peak-to-average force ratio is big at present, this can make the non-linear more serious of system again, because broadband signal will be because the new frequency component of non-linear generation will be abundanter, and in order when peak value appears in signal, to reduce the generation of the spectral re-growth that causes owing to peak compression, therefore will guarantee transmission channel or equipment work in the better linearity district, this has brought very big pressure also for system design and Component Design.For reaching the requirement of system to linear index, people have to sacrifice efficient and realize linearizing requirement, and wish by the contradiction between linearizing means mitigation efficient and the linearity.
Linearization technique commonly used at present comprises feedforward linearized technology, feedback linearization technology and predistortion linear technology.
Feedforward linearized technology is by the nonlinear distortion signal of output and the standard signal of input are compared processing, take out distorted signal, adjust the amplitude and the phase place of this distorted signal then, and under the situation that guarantees the time-delay coupling, offset distorted signal at output.The advantage of this technology is to utilize the nonlinear distortion of power amplifier self to eliminate the nonlinear distortion of power amplifier, so non-linear matches gets relatively good; Shortcoming then have following some: 1) main ring and error loop need well coupling; 2) finish offseting of distorted signal at output and understand the loss power output; 3) this technology mainly adopts radio circuit to realize that productibility is relatively poor relatively; 4) the error power amplifier needs more high-power; 5) efficient is lower.
The feedback linearization technology be the distorted signal that will take out again from the input input, realizes simply relatively, but owing to time delay can't be mated, so limited bandwidth, and can cause the instability of system.
Pre-distortion technology is to add the distorted signal opposite with channel characteristic to carry out distortion in advance in the standard signal of input, thereby reaches the purpose of eliminating distortion, and this technology can make system have higher efficient, and the way of realization of circuit is also simpler.Pre-distortion technology is divided into two kinds of analog predistortion technology and digital pre-distortion technologies again.
The analog predistortion technology is to adopt analog circuit to realize predistortion, mainly contains two kinds of schemes.A kind of scheme is to utilize some analogue devices to have with the non-linear opposite characteristic of signal sendaisle or equipment to realize that this method is simple relatively, but consistency is poor, is difficult to produce in batches.Another kind of scheme is to adopt analog operational circuit to realize, calculate distorted signal by analog operational circuit, thereby realize weakening or elimination to nonlinear distortion, but this scheme relatively relies on the characteristic of analogue device, the effect of predistortion is subjected to the properties influence of analogue device bigger, and also relative complex of circuit form.In addition, the characteristic of analogue device or analog operational circuit can be opposite fully with the characteristic of the passage for the treatment of predistortion or equipment is very difficult, can only approximate match, and the coupling interval is very little, and brought difficulty for debugging and production equally.
Digital pre-distortion technology normally is kept at an enquiry form (Look-Up Table to the parameter of predistortion, be called for short LUT) in, I, the Q signal of different inputs call different compensation rate Δ I, Δ Q, then by distortion detection to output, refresh the pre-distortion parameters among the LUT adaptively, finally reach a good predistortion effect.In addition, digital pre-distortion technology also can be set up the model of distorted signal earlier, with the distorted signal that calculates by way of compensation signal add the sendaisle and the equipment of signal together, pass through the distortion detection of output then, adjusting the parameter of pre-distorted signals adaptively, thereby reach the function that weakens with the erasure signal distortion.But its adaptive algorithm that adopts is comparatively complicated.
Summary of the invention
The present invention just is being based on above-mentioned technical problem proposition of the prior art, and its purpose is to provide a kind of analog predistortion linear method, the effectively distortion of erasure signal, and can realize very wide band pre-distortion.
Another object of the present invention is to provide a kind of device of realizing above-mentioned analog predistortion linear method, and circuit is realized simple, has good productibility.
According to an aspect of the present invention, a kind of analog predistortion linear method is provided, wherein the generation of pre-distorted signals is based on the analog operational circuit realization, comprise: original input signal is carried out the amplitude adjustment, and be down-converted to intermediate frequency or low frequency, by producing pre-distorted signals through the signal that obtains after amplitude adjustment and the down-converted; Also original input signal is done the time-delay matching treatment, described pre-distorted signals is added transmission together in the signal that obtains through the time-delay matching treatment; Signal after the transmission is carried out distortion detection, and optimize the amplitude and the phase parameter of described pre-distorted signals adaptively.
Preferably, the step of described generation pre-distorted signals further comprises: the three rank pre-distorted signals that the input signal after the calculating frequency conversion produces; Described three rank pre-distorted signals are carried out frequency conversion, recover original frequency; Three rank pre-distorted signals after the frequency conversion are carried out the adjustment of amplitude and phase place.
Preferably, the step of described generation pre-distorted signals further comprises: the three rank pre-distorted signals that the input signal after the calculating frequency conversion produces; Calculate five rank pre-distorted signals according to input signal after the frequency conversion and described three rank pre-distorted signals; To described three rank and the five rank pre-distorted signals coupling of delaying time; Described two pre-distorted signals are carried out frequency conversion, recover original frequency; Described two pre-distorted signals after the frequency conversion are carried out the adjustment of amplitude and phase place; Described two pre-distorted signals are synthesized new pre-distorted signals.
Preferably, the step of described generation pre-distorted signals further comprises: the three rank pre-distorted signals that the input signal after the calculating frequency conversion produces; Calculate five rank pre-distorted signals according to input signal after the frequency conversion and described three rank pre-distorted signals; Calculate seven rank distorted signals according to the input signal after the frequency conversion, described third order distortion signal and five rank distorted signals; With described three rank, five rank and the seven rank distorted signals coupling of delaying time; To described three rank, five rank and the seven rank pre-distorted signals coupling of delaying time; Described three pre-distorted signals are carried out frequency conversion, recover original frequency; Described three pre-distorted signals after the frequency conversion are carried out the adjustment of amplitude and phase place; Described three pre-distorted signals are synthesized new pre-distorted signals.
According to another aspect of the present invention, provide a kind of device of realizing above-mentioned analog predistortion linear method, comprising: the pre-distortion module and the self-adaptive processing module that lay respectively at transmission channel or the equipment input and the output of communication system; Wherein,
Described pre-distortion module is used for utilizing analog operational circuit generation pre-distorted signals and adds input signal, comprising:
Signal distribution unit is used for original input signal is divided into the two-way input signal, and wherein the second road input signal is used to produce pre-distorted signals;
First timelag matching unit is used for the first via input signal coupling of delaying time;
Amplitude adjustment unit is used for the amplitude of described the second road input signal is adjusted;
First converter unit is used for described the second road input signal after the adjusting range is down-converted to intermediate frequency or low frequency;
The pre-distorted signals generation unit is used to produce pre-distorted signals;
First combiner unit is used for described first via input signal and described pre-distorted signals after the time-delay coupling are synthesized;
Described self-adaptive processing module is used to produce the control signal of importing described amplitude adjustment unit, comprising:
The distortion detection unit is used for extracting and detect distorted signal from output signal;
Self-adaptive processing and control unit are used for handling and analyzing described distorted signal, and produce the control signal that is used to import described amplitude adjustment unit, with amplitude and the phase parameter of optimizing described pre-distorted signals.
Preferably, described pre-distorted signals generation unit further comprises:
Three rank pre-distorted signals generation units are used to generate original three rank pre-distorted signals;
Second converter unit is used for described original three rank pre-distorted signals are converted to original frequency;
First width of cloth phase adjustment unit is used for three rank pre-distorted signals of described second converter unit output are carried out the adjustment of amplitude and phase place.
Preferably, described pre-distorted signals generation unit also comprises:
Second timelag matching unit is used for the described original three rank pre-distorted signals coupling of delaying time;
Five rank pre-distorted signals generation units are used to generate original five rank pre-distorted signals;
The 3rd converter unit is used for described original five rank pre-distorted signals are converted to original frequency;
Second width of cloth phase adjustment unit is used for five rank pre-distorted signals of described the 3rd converter unit output are carried out the adjustment of amplitude and phase place;
Second combiner unit is used for the pre-distorted signals of described first, second width of cloth phase adjustment unit output is synthesized new pre-distorted signals; Wherein,
Described second converter unit is used for three rank pre-distorted signals of described second timelag matching unit output are converted to original frequency.
Preferably, described pre-distorted signals generation unit also comprises:
The 3rd timelag matching unit is used for the described original five rank pre-distorted signals coupling of delaying time;
Seven rank pre-distorted signals generation units are used to generate original seven rank pre-distorted signals;
The 4th converter unit is used for original seven rank pre-distorted signals are converted to original frequency;
The 3rd width of cloth phase adjustment unit is used for seven rank pre-distorted signals of described the 4th converter unit output are carried out the adjustment of amplitude and phase place; Wherein,
Described the 3rd converter unit is used for five rank pre-distorted signals of described the 3rd timelag matching unit output are converted to original frequency;
Second combiner unit is used for the pre-distorted signals of described first, second, third width of cloth phase adjustment unit output is synthesized new pre-distorted signals.
The method of the invention and device adopt analog form to produce pre-distorted signals, can realize very wide frequency band and dynamic range, and pre-distorted signals produces at intermediate frequency or low frequency simultaneously, has stronger realizability and productibility, and cost is lower; The present invention is by setting up nonlinear model preferably, can reach good linearisation effect, can reduce or the elimination system in nonlinear distortion, and reduce because non-linear and back-off that cause, thereby improve the efficient of system, can be applied to exist non-linear and nonlinear distortion is had the system of certain qualification.In addition, the power consumption of pre-distorted signals is very little, and is also very low to the influence of efficient.
Description of drawings
Fig. 1 is the flow chart of analog predistortion linear method according to an embodiment of the invention;
Fig. 2 is the flow chart that produces pre-distorted signals among Fig. 1, and wherein pre-distorted signals is three rank pre-distorted signals;
Fig. 3 is the flow chart that produces pre-distorted signals among Fig. 1, and wherein pre-distorted signals is three rank and five rank pre-distorted signals;
Fig. 4 is the flow chart that produces pre-distorted signals among Fig. 1, and wherein pre-distorted signals is three rank, five rank and seven rank pre-distorted signals;
Fig. 5 is the structural representation of the device of realization analog predistortion linear according to an embodiment of the invention;
Fig. 6 is the schematic diagram of first converter unit among Fig. 5;
Fig. 7 is the schematic diagram of pre-distorted signals generation unit among Fig. 5;
Fig. 8 is the structural representation of the device of realization analog predistortion linear according to another embodiment of the invention.
Embodiment
Believe by below in conjunction with the detailed description of accompanying drawing, can more clearly understand above and other objects of the present invention, feature and advantage the preferred embodiment of the present invention.
Fig. 1 is the flow chart of analog predistortion linear method according to an embodiment of the invention.As shown in Figure 1, in step 100, input signal is carried out the amplitude adjustment, so its purpose is fit to the processing of simulation trial in the amplitude of input signal, the adjustment amount of signal amplitude is to determine according to the size of input signal, can set up the mapping table of input signal and amplitude adjustment amount, different input signals adopts different adjustment amounts.In step 110, the signal down-conversion to adjusting through amplitude changes to intermediate frequency or low frequency with its frequency, for fear of the interference of unwanted signal, also the signal after the frequency conversion has been carried out the filtering amplification.In step 120, utilize the signal after the above-mentioned processing to produce pre-distorted signals, the generation of relevant pre-distorted signals will describe in detail in the back.In step 130, the pre-distorted signals that produces is added in the input signal of process time-delay matching treatment then, then together by sendaisle or device transmission.In step 140, to carrying out distortion detection, extract distorted signal, and in step 150, distorted signal is analyzed through the signal after the transmission, optimize the amplitude of pre-distorted signals and the control signal of phase parameter adaptively.Above-mentioned control signal is fed back in the step 120 and other signal produces pre-distorted signals together, continues step 130,140 and 150 then, the distorted signal amplitude minimum that distortion detection is arrived.
Fig. 2 is to be under the situation of three rank pre-distorted signals at pre-distorted signals, produces the flow chart of the step 120 of pre-distorted signals among Fig. 1.At first in step 201, the three rank pre-distorted signals that input signal after the calculating down-conversion produces, then in step 205, the frequency of this three rank pre-distorted signals is changed to original frequency, at last in step 210, amplitude and phase place through three rank pre-distorted signals of up-conversion are adjusted the pre-distorted signals that amplitude is equal, phase place is opposite of the nonlinear distortion that produces with generation and transmission channel or equipment.In this step, the adjustment signal of the amplitude of pre-distorted signals and phase place is from the control signal that produces in the step 150.
Fig. 3 is to be under the situation of three rank and five rank pre-distorted signals at pre-distorted signals, produces the flow chart of the step 120 of pre-distorted signals among Fig. 1, and wherein identical with Fig. 2 step adopts identical mark, and omits its explanation.After having produced three rank pre-distorted signals,, calculate five rank pre-distorted signals according to input signal after the down-conversion and three rank pre-distorted signals in step 305.Owing to there be not matching of time delay, therefore need be in step 310, to the three rank pre-distorted signals coupling of delaying time, three rank pre-distorted signals after mating through time-delay carry out up-conversion again in step 205.In step 315, five rank pre-distorted signals are carried out up-conversion then, recover its original frequency.In step 320, five rank pre-distorted signals through up-conversion are carried out the adjustment of amplitude and phase place, in this step, the adjustment signal of the amplitude of pre-distorted signals and phase place is also from the control signal that produces in the step 150.In step 325, these two pre-distorted signals are synthesized new pre-distorted signals at last, the pre-distorted signals that the amplitude of the nonlinear distortion that generation and transmission channel or equipment produce equates, phase place is opposite.
Fig. 4 is to be under the situation of three rank, five rank and seven rank pre-distorted signals at pre-distorted signals, produces the flow chart of the step 120 of pre-distorted signals among Fig. 1, and wherein identical with Fig. 2, Fig. 3 step adopts identical mark, and omits its explanation.After having produced three rank pre-distorted signals and five rank pre-distorted signals respectively,, calculate seven rank distorted signals according to the input signal after the down-conversion, three rank pre-distorted signals and five rank pre-distorted signals in step 410.Because there be not matching of time delay in three rank, five rank and seven rank pre-distorted signals, therefore except the coupling of delaying time at step 310 pair three rank pre-distorted signals, also will be in the step 415 pair five rank pre-distorted signals coupling of delaying time.In step 205 and step 315, carry out up-conversion through three of time-delay coupling respectively in conjunction with five rank pre-distorted signals.In step 420, seven rank pre-distorted signals are carried out up-conversion, recover original frequency.In step 425, seven rank pre-distorted signals after the up-conversion are carried out the adjustment of amplitude and phase place then, the adjustment signal of its amplitude and phase place is also from the control signal that produces in the step 150.In step 430, these three pre-distorted signals are synthesized new pre-distorted signals at last, obtain the pre-distorted signals that amplitude equates, phase place is opposite of the nonlinear distortion that produces with transmission channel or equipment.
By above description as can be known, adopt present embodiment, can produce pre-distorted signals at intermediate frequency or low frequency, and finish the amplitude and the phase place adjustment of pre-distorted signals on radio frequency, the distortion in the effectively elimination system is raised the efficiency.In addition, present embodiment can be distinguished independent control three rank, five rank and seven rank pre-distorted signals, can eliminate distorted signal better, finally reach the predistortion effect an of the best, and required pre-distorted signals can be determined according to the characteristics of the passage for the treatment of predistortion and equipment, promptly can only need three rank pre-distorted signals, perhaps three rank and five rank pre-distorted signals, perhaps three rank, five rank and seven rank pre-distorted signals, even the pre-distorted signals of high-order more.In addition, the adaptive control that present embodiment adopted is fairly simple, and the parameter that its adaptive algorithm is handled is specific physical quantity, and these physical quantitys have only an extreme value to result's influence, therefore is easy to convergence.
Fig. 5 is the structural representation of the device of realization analog predistortion linear according to an embodiment of the invention.As shown in Figure 5, this device comprises pre-distortion module 50 and self-adaptive processing module 60, and original input signal produces the input signal that has pre-distorted signals by pre-distortion module 50, outputs in transmission channel or the equipment and transmits.At the output of transmission channel or equipment, self-adaptive processing module 60 extracts distorted signal from the signal of output, and it is detected, and adjusts the amplitude and the phase parameter of pre-distorted signals then adaptively.
Pre-distortion module 50 comprises: signal distribution unit 501, and it is divided into the two-way input signal with original input signal, and wherein first via input signal still keeps original input signal, only carries out delay operation, and the second road input signal then is used to produce pre-distorted signals; First timelag matching unit 502 is with the first via input signal coupling of delaying time, to mate with the pre-distorted signals that produces on time delay; Amplitude adjustment unit 503 can be selected corresponding adjustment amount according to the size of original input signal, and adjust the amplitude of the second road input signal by adjustment amount; First converter unit 504, its input signal after with adjusting range carries out down-conversion, and frequency is changed to intermediate frequency or low frequency; Pre-distorted signals generation unit 505 adopts analog operational circuit to constitute, and can produce pre-distorted signals at intermediate frequency or low frequency; First combiner unit 506 will synthesize through the first via input signal of time-delay coupling and the pre-distorted signals of generation, output to transmission channel or equipment.
Self-adaptive processing module 60 comprises: distortion detection unit 601 extracts distorted signal at the output of transmission channel or equipment, and it is detected from output signal; Self-adaptive processing and control unit 602, result according to detecting further handles and analyzes distorted signal, produces the signal that the amplitude and the phase place of pre-distorted signals are controlled, to optimize the amplitude and the phase parameter of pre-distorted signals, make detected distorted signal minimum.
The course of work of the device of realization analog predistortion linear shown in Figure 5 is as follows: after original input signal enters pre-distortion module 50, be divided into the two-way input signal by signal distribution unit 501, wherein first via input signal is input in the first time-delay matching module 502, on time delay, mate with the pre-distorted signals that produces by the second road input signal, thereby the time delay that guarantees two signals is mated, and promptly two signals are positioned at the same cycle.The second road input signal then is used to produce pre-distorted signals, and at first input signal carries out the amplitude adjustment in amplitude adjustment unit 503, makes its amplitude be suitable for the processing of pre-distorted signals generation unit 505; The size that signal amplitude is adjusted determines that by the size of input signal can set up a correspondence table according to the size and the adjustment amount of input signal in advance, different input signals calls different adjustment amounts.In first converter unit 504, the frequency of signal is changed to intermediate frequency or low frequency then, so that the processing of pre-distorted signals generation unit 505.In the signal input predistortion generation unit 505 after the frequency conversion, to produce pre-distorted signals.Pre-distorted signals and the first via input signal that mates through time-delay synthesize in first combiner unit 506, output to then in transmission channel or the equipment and launch.Output at transmission channel or equipment, distortion detection unit 601 extracts distorted signal from output signal, and detect, distorted signal is further processed and analyzes in self-adaptive processing and control unit 602 then, produce the amplitude control signal and the phase control signal of pre-distorted signals adaptively, the amplitude and the phase place of pre-distorted signals is optimized adjustment.In addition, self-adaptive processing and control unit 602 also produce the control signal A1 to amplitude adjustment unit 503, optimize the amplitude adjustment to input signal.A1 is used to adjust the amplitude that enters predistortion circuit, makes the processing of suitable predistortion circuit of its amplitude, and its value is relevant with the input signal size, when adaptive control is handled, can use the LUT form, and different input signals calls the value of different A1.
Fig. 6 shows the schematic diagram of first converter unit 504 among Fig. 5, and first converter unit 504 further comprises: the local oscillation signal unit 5041 that local oscillation signal is provided; First amplifying circuit 5042 amplifies local oscillation signal, drives the frequency mixer 5043 that describes below; Frequency mixer 5043 carries out frequency conversion to signal, and the frequency of signal is changed to intermediate frequency or low frequency; Low pass filter 5044 carries out filtering with the signal after the frequency conversion, only allows required intermediate frequency or low frequency signal pass through; Second amplifying circuit 5045 amplifies filtered signal.
In first converter unit 504, by local oscillation signal unit 5041 is set, can obtain a suitable local oscillation signal, the frequency of this local oscillation signal is relevant with intermediate frequency.Local oscillation signal drives frequency mixer 5043 and carries out frequency conversion by after the amplification of first amplifying circuit 5042; Process amplitude adjustment unit 503 adjusted input signals are input to and carry out frequency conversion in the frequency mixer 5043, make the frequency of input signal change to intermediate frequency.Signal after the frequency conversion is input to and carries out filtering in the low pass filter 5044, because the frequency spectrum of the signal after the frequency conversion is very assorted, needs filtering interfering, only allows required intermediate-freuqncy signal pass through, and the signal of other frequency is suppressed.Be amplified to a suitable amplitude through filtered signal by second amplifying circuit 5045, enter the amplitude of the signal of pre-distorted signals generation unit 505 with assurance.
Fig. 7 is the schematic diagram of pre-distorted signals generation unit 505.Pre-distorted signals generation unit 505 comprises three rank pre-distorted signals generation units 521, can adopt analog operational circuit to realize that its frequency is intermediate frequency or low frequency.Three rank pre-distorted signals generation units 521 calculate the original three rank pre-distorted signals that signal can take place according to input signal, output to second converter unit 522.Second converter unit 522 can be converted to the original frequency of input signal with the original three rank pre-distorted signals that calculate, and in order to guarantee the stability of frequency, whole conversion process is used same local oscillation signal.Output in first width of cloth phase adjustment unit 523 through the signal after the frequency conversion.First width of cloth phase adjustment unit 523, the three rank pre-distorted signals that change back to original frequency are carried out the adjustment of amplitude and phase place, the control signal of its amplitude and phase place adjustment is the control signal A2 and the P1 of self-adaptive processing and control unit 602 outputs, wherein A2 is used to control the amplitude of three rank pre-distorted signals, and P1 is used to control the phase place of three rank pre-distorted signals.Three rank pre-distorted signals through adjustment equate with the amplitude of the nonlinear distortion of transmission channel or equipment generation, phase place is opposite, thereby weaken or eliminate the nonlinear distortion of transmission channel or equipment generation.First width of cloth phase adjustment unit 523 outputs to signal in first combiner unit 506.
Pre-distorted signals generation unit 505 can also comprise: five rank pre-distorted signals generation units 524 can produce original five rank pre-distorted signals.Original five rank pre-distorted signals are relevant with original three rank pre-distorted signals, and five rank pre-distorted signals generation units 524 calculate original five rank pre-distorted signals jointly according to the signal and the original three rank pre-distorted signals of 504 outputs of first converter unit.Because there be not matching of time delay in original three rank pre-distorted signals and original five rank pre-distorted signals, therefore need the original three rank pre-distorted signals coupling of delaying time, this operation realizes by second timelag matching unit 525, will carry out frequency conversion in second converter unit 522 through three rank pre-distorted signals of time-delay coupling then.Original five rank pre-distorted signals carry out frequency conversion in the 3rd converter unit 526, recover original frequency, and the local oscillation signal that frequency conversion is adopted is constant.Five rank pre-distorted signals after the frequency conversion carry out the adjustment of amplitude and phase place by second width of cloth phase adjustment unit 527, the control signal of its amplitude and phase place adjustment is the control signal A3 and the P2 of self-adaptive processing and control unit 602 outputs, wherein A3 is used to control the amplitude of five rank pre-distorted signals, and P2 is used to control the phase place of five rank pre-distorted signals.Pre-distorted signals through adjustment equates with the amplitude of the nonlinear distortion of transmission channel or equipment generation, phase place is opposite, thereby weakens or eliminate the nonlinear distortion of transmission channel or equipment generation.Also comprise second combiner unit 528 in the pre-distorted signals generation unit 505, with first width of cloth phase adjustment unit 523 and second width of cloth mutually the pre-distorted signals of adjustment unit 527 outputs synthesize new pre-distorted signals, output in first combiner unit 506.
Pre-distorted signals generation unit 505 can also comprise: seven rank pre-distorted signals generation units 529, signal and original three rank pre-distorted signals, the original five rank pre-distorted signals exported according to first converter unit 504 calculate original seven rank pre-distorted signals jointly.Similarly, because there be not matching of time delay in original three rank pre-distorted signals, original five rank pre-distorted signals and original seven rank pre-distorted signals, therefore need original three rank pre-distorted signals and the original five rank pre-distorted signals coupling of delaying time, time-delay coupling to original three rank pre-distorted signals realizes by second timelag matching unit 525, and the time-delay coupling of original five rank pre-distorted signals is realized by the 3rd timelag matching unit 530, thereby the time-delay that realizes three pre-distorted signals is mated.Five rank pre-distorted signals through the time-delay coupling carry out frequency conversion by the 3rd converter unit 526.Original seven rank pre-distorted signals carry out frequency conversion in the 4th converter unit 531, recover original frequency, output in the 3rd width of cloth phase adjustment unit 532.532 pairs seven rank pre-distorted signals of the 3rd width of cloth phase adjustment unit carry out the adjustment of amplitude and phase place, the control signal of its amplitude and phase place adjustment is the control signal A4 and the P3 of self-adaptive processing and control unit 602 outputs, wherein A4 is used to control the amplitude of seven rank pre-distorted signals, and P3 is used to control the phase place of seven rank pre-distorted signals.Pre-distorted signals through adjustment equates with the amplitude of the nonlinear distortion of transmission channel or equipment generation, phase place is opposite, thereby weakens or eliminate the nonlinear distortion of transmission channel or equipment generation.Second combiner unit 528 with first width of cloth phase adjustment unit 523, second width of cloth phase adjustment unit 527 and the 3rd width of cloth mutually the pre-distorted signals of adjustment unit 532 output synthesize new pre-distorted signals, output in first combiner unit 506.
For first width of cloth phase adjustment unit 523, second width of cloth phase adjustment unit 527 and the 3rd width of cloth adjustment unit 532 mutually, can adopt attenuator adjusting range, phase shifter to adjust phase place, also can adopt vector modulator adjusting range and phase place simultaneously.
By above description as can be known, present embodiment adopts the analog linearity computing circuit to produce pre-distorted signals, do not rely on baseband I, Q signal, increased the dynamic range of using greatly and improved productibility, can produce three rank, five rank and seven rank pre-distorted signals simultaneously relatively independently; And the analog operational circuit realization is simple, and electromagnetic compatibility problem solves easily, and cost is low.In addition, present embodiment can be realized very wide band pre-distortion, as from million to last G bandwidth up to a hundred.
Fig. 8 is the structural representation of the device of realization analog predistortion linear according to another embodiment of the invention, wherein adopts identical mark, and omits its explanation with Fig. 5, Fig. 7 components identical.Be adjusted at the phase place of pre-distorted signals in the previous embodiment and realize differently on the main road of pre-distorted signals, in the present embodiment, the phase place of pre-distorted signals is adjusted in the phase shift of local oscillation signal and realizes.Therefore, in this embodiment, also comprise the first local oscillator phase-shifting unit 541 in the pre-distorted signals generation unit 505, local oscillation signal is transplanted and amplifies, output to second converter unit 522, wherein Yi Xiang control signal is the control signal P1 of self-adaptive processing and control unit 602 outputs; The second local oscillator phase-shifting unit 544 transplants and amplifies local oscillation signal, outputs to the 3rd converter unit 526, and wherein Yi Xiang control signal is the control signal P2 of self-adaptive processing and control unit 602 outputs; The 3rd local oscillator phase-shifting unit 546 transplants and amplifies local oscillation signal, outputs to the 4th converter unit 531, and wherein Yi Xiang control signal is the control signal P3 of self-adaptive processing and control unit 602 outputs.In addition, also comprise: first amplitude adjustment unit 542, three rank pre-distorted signals after the frequency conversion are carried out the amplitude adjustment, wherein the control signal of amplitude adjustment is the control signal A2 of self-adaptive processing and control unit 602 outputs; Second amplitude adjustment unit 545 is carried out the amplitude adjustment to five rank pre-distorted signals after the frequency conversion, and wherein the control signal of amplitude adjustment is the control signal A3 of self-adaptive processing and control unit 602 outputs; The 3rd amplitude adjustment unit 547 is carried out the amplitude adjustment to seven rank pre-distorted signals after the frequency conversion, and wherein the control signal of amplitude adjustment is the control signal A4 of self-adaptive processing and control unit 602 outputs.In the present embodiment, adopt same local oscillation signal.
By above description as can be known, adopt present embodiment, the phase place adjustment of pre-distorted signals can be finished on local oscillator, because local oscillation signal is a tone signal, the uneven shortcoming that does not have amplitude, phase place and time delay in the band, therefore can avoid uneven in the band that phasing unit causes when the bandwidth ratio broad, and the changes in amplitude that when adjusting phase place, causes.
The present invention can be applied to weakening of nonlinear distortion and eliminate, and the present invention all can be adopted in every place of nonlinear distortion that exists.Specifically, the present invention can be applied to transmission channel or equipment, the passage of data transmission system or the transmission channel or the equipment of equipment and optical communication of mobile communication system.
More than by preferred embodiment and in conjunction with particular device the present invention is described in detail, but only be as exemplary explanation, it will be understood by those of skill in the art that and under the situation that does not break away from spirit of the present invention, to carry out substitutions and modifications embodiments of the invention.Scope of the present invention is defined by the appended claims.
Claims (14)
1. an analog predistortion linear method is characterized in that, the generation of pre-distorted signals is based on analog operational circuit and realizes, comprising:
Original input signal is carried out the amplitude adjustment, and be down-converted to intermediate frequency or low frequency, according to producing pre-distorted signals through the signal that obtains after amplitude adjustment and the down-converted;
Also described original input signal is done the time-delay matching treatment, described pre-distorted signals is added transmission together in the signal that obtains through the time-delay matching treatment;
Signal after the transmission is carried out distortion detection, and optimize the amplitude and the phase parameter of described pre-distorted signals adaptively.
2. analog predistortion linear method according to claim 1 is characterized in that, the described step that original input signal is carried out the amplitude adjustment further comprises: the adjustment amount of determining signal amplitude according to the size of original input signal; Adjust the amplitude of signal according to the amplitude adjustment amount.
3. analog predistortion linear method according to claim 2 is characterized in that, describedly optimizes the amplitude of pre-distorted signals adaptively and the step of phase parameter comprises: according to the distortion detection result, distorted signal is analyzed; Produce the amplitude of pre-distorted signals and the control signal of phase parameter adaptively, and optimize the amplitude and the phase parameter of described pre-distorted signals according to this control signal adaptively;
Described pre-distorted signals adds after the step of transmitting in the signal that obtains through the time-delay matching treatment, also comprises a step:, distorted signal is analyzed according to the distortion detection result; Generation is carried out the control signal that amplitude is adjusted to described original input signal, and the amplitude adjustment to original input signal is optimized according to described control signal.
4. according to the arbitrary described analog predistortion linear method of claim 1 to 3, it is characterized in that the step of described generation pre-distorted signals further comprises: the three rank pre-distorted signals that the input signal after the calculating frequency conversion produces; Described three rank pre-distorted signals are carried out frequency conversion, recover original frequency; Three rank pre-distorted signals after the frequency conversion are carried out the adjustment of amplitude and phase place.
5. according to the arbitrary described analog predistortion linear method of claim 1 to 3, it is characterized in that the step of described generation pre-distorted signals further comprises: the three rank pre-distorted signals that the input signal after the calculating frequency conversion produces; Calculate five rank pre-distorted signals according to input signal after the frequency conversion and described three rank pre-distorted signals; To described three rank and the five rank pre-distorted signals coupling of delaying time; Described two pre-distorted signals are carried out frequency conversion, recover original frequency; Described two pre-distorted signals after the frequency conversion are carried out the adjustment of amplitude and phase place; Described two pre-distorted signals are synthesized new pre-distorted signals.
6. according to the arbitrary described analog predistortion linear method of claim 1 to 3, it is characterized in that the step of described generation pre-distorted signals further comprises: the three rank pre-distorted signals that the input signal after the calculating frequency conversion produces; Calculate five rank pre-distorted signals according to input signal after the frequency conversion and described three rank pre-distorted signals; Calculate seven rank distorted signals according to the input signal after the frequency conversion, described third order distortion signal and five rank distorted signals; With described three rank, five rank and the seven rank distorted signals coupling of delaying time; To described three rank, five rank and the seven rank pre-distorted signals coupling of delaying time; Described three pre-distorted signals are carried out frequency conversion, recover original frequency; Described three pre-distorted signals after the frequency conversion are carried out the adjustment of amplitude and phase place; Described three pre-distorted signals are synthesized new pre-distorted signals.
7. a device of realizing the described analog predistortion linear method of claim 1 comprises: the pre-distortion module and the self-adaptive processing module that lay respectively at transmission channel or the equipment input and the output of communication system; It is characterized in that,
Described pre-distortion module is used for utilizing analog operational circuit generation pre-distorted signals and adds input signal, comprising:
Signal distribution unit is used for original input signal is divided into the two-way input signal, and wherein the second road input signal is used to produce pre-distorted signals;
First timelag matching unit is used for the first via input signal coupling of delaying time;
Amplitude adjustment unit is used for the amplitude of described the second road input signal is adjusted;
First converter unit is used for described the second road input signal after the adjusting range is down-converted to intermediate frequency or low frequency;
The pre-distorted signals generation unit is used to produce pre-distorted signals;
First combiner unit is used for described first via input signal and described pre-distorted signals after the time-delay coupling are synthesized;
Described self-adaptive processing module is used to produce the control signal of the described amplitude adjustment unit of input and the control signal of importing described pre-distorted signals generation unit, comprising:
The distortion detection unit is used for extracting and detect distorted signal from output signal;
Self-adaptive processing and control unit, be used for handling and analyzing described distorted signal, be used to import amplitude and the phase parameter of control signal to optimize described pre-distorted signals of described pre-distorted signals generation unit with generation, and produce and be used to import the control signal of described amplitude adjustment unit to optimize amplitude adjustment to the second road input signal.
8. device according to claim 7 is characterized in that, described first converter unit further comprises:
The local oscillation signal unit is used to provide local oscillation signal;
First amplifying circuit is used for local oscillation signal is amplified;
Frequency mixer is used under the driving of described amplifying circuit signal being carried out frequency conversion;
Low pass filter is used for the interference of signal after the filtering frequency conversion;
Second amplifying circuit is used for filtered signal is amplified.
9. according to claim 7 or 8 described devices, it is characterized in that described pre-distorted signals generation unit further comprises:
Three rank pre-distorted signals generation units are used to generate original three rank pre-distorted signals;
Second converter unit is used for described original three rank pre-distorted signals are converted to original frequency;
First width of cloth phase adjustment unit is used for three rank pre-distorted signals of described second converter unit output are carried out the adjustment of amplitude and phase place.
10. device according to claim 9 is characterized in that, described pre-distorted signals generation unit also comprises:
Second timelag matching unit is used for the described original three rank pre-distorted signals coupling of delaying time;
Five rank pre-distorted signals generation units are used to generate original five rank pre-distorted signals;
The 3rd converter unit is used for described original five rank pre-distorted signals are converted to original frequency;
Second width of cloth phase adjustment unit is used for five rank pre-distorted signals of described the 3rd converter unit output are carried out the adjustment of amplitude and phase place;
Second combiner unit is used for the pre-distorted signals of described first, second width of cloth phase adjustment unit output is synthesized new pre-distorted signals; Wherein,
Described second converter unit is used for three rank pre-distorted signals of described second timelag matching unit output are converted to original frequency.
11. device according to claim 10 is characterized in that, described pre-distorted signals generation unit also comprises:
The 3rd timelag matching unit is used for the described original five rank pre-distorted signals coupling of delaying time;
Seven rank pre-distorted signals generation units are used to generate original seven rank pre-distorted signals;
The 4th converter unit is used for original seven rank pre-distorted signals are converted to original frequency;
The 3rd width of cloth phase adjustment unit is used for seven rank pre-distorted signals of described the 4th converter unit output are carried out the adjustment of amplitude and phase place; Wherein,
Described the 3rd converter unit is used for five rank pre-distorted signals of described the 3rd timelag matching unit output are converted to original frequency;
Second combiner unit is used for the pre-distorted signals of described first, second, third width of cloth phase adjustment unit output is synthesized new pre-distorted signals.
12., it is characterized in that described pre-distorted signals generation unit further comprises according to claim 7 or 8 described devices:
Three rank pre-distorted signals generation units are used to generate original three rank pre-distorted signals;
The first local oscillator phase-shifting unit is used for local oscillation signal is transplanted and amplifies;
Second converter unit is used for described original three rank pre-distorted signals are converted to original frequency;
First amplitude adjustment unit is used for three rank pre-distorted signals of described second converter unit output are carried out the amplitude adjustment.
13. device according to claim 12 is characterized in that, described pre-distorted signals generation unit also comprises:
Second timelag matching unit is used for the described original three rank pre-distorted signals coupling of delaying time;
Five rank pre-distorted signals generation units are used to generate original five rank pre-distorted signals;
The second local oscillator phase-shifting unit is used for local oscillation signal is transplanted and amplifies;
The 3rd converter unit is used for described original five rank pre-distorted signals are converted to original frequency;
Second amplitude adjustment unit is used for five rank pre-distorted signals of described the 3rd converter unit output are carried out the amplitude adjustment;
Second combiner unit is used for the pre-distorted signals of described first, second amplitude adjustment unit output is synthesized new pre-distorted signals; Wherein,
Described second converter unit is used for three rank pre-distorted signals of described second timelag matching unit output are converted to original frequency.
14. device according to claim 13 is characterized in that, described pre-distorted signals generation unit also comprises:
The 3rd timelag matching unit is used for the described original five rank pre-distorted signals coupling of delaying time;
Seven rank pre-distorted signals generation units are used to generate original seven rank pre-distorted signals;
The 3rd local oscillator phase-shifting unit is used for local oscillation signal is transplanted and amplifies;
The 4th converter unit is used for original seven rank pre-distorted signals are converted to original frequency;
The 3rd amplitude adjustment unit is used for seven rank pre-distorted signals of described the 4th converter unit output are carried out the amplitude adjustment; Wherein,
Described the 3rd converter unit is used for five rank pre-distorted signals of described the 3rd timelag matching unit output are converted to original frequency;
Described second combiner unit is used for the pre-distorted signals of described first, second, third amplitude adjustment unit output is synthesized new pre-distorted signals.
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| PCT/CN2004/001542 WO2006069477A1 (en) | 2004-12-28 | 2004-12-28 | A method and equipment of simulating predistortion linearization |
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