CN101827054A - Precompensation method and device of nonlinear distortion and transmitter - Google Patents
Precompensation method and device of nonlinear distortion and transmitter Download PDFInfo
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Abstract
The invention provides precompensation method and device of nonlinear distortion and a transmitter. The precompensation method comprises the following steps of: obtaining each sub audio frequency signal in audio frequency signals respectively corresponding to a plurality of preset frequency ranges; obtaining amplitude of the sub audio frequency signals and amplitude of a carrier wave; adjusting the amplitude of each sub audio frequency signal according to adjustment parameters corresponding to each preset frequency range, the amplitude of each sub audio frequency signal and the amplitude of the carrier wave; accumulating a plurality of amplitude-adjusted sub audio frequency signals and sending to a pulse step modulating transmitter so that the transmitter modulates and transmits amplitude-adjusted audio frequency signals. The precompensation device comprises a sub audio frequency signal obtaining module consisting of a plurality of wave filters, an amplitude obtaining module, an amplitude adjusting module and a signal sending module. The transmitter comprises the precompensation device of the nonlinear distortion. The precompensation method and device and the transmitter provided by the invention use the adjusted amplitude of the audio frequency signals to compensate the nonlinear distortion and have simple realization compared with the prior art.
Description
Technical field
The embodiment of the invention relates to technical field of radio, relates in particular to a kind of precompensation method and device and transmitter of nonlinear distortion.
Background technology
Short-wave transmitter mainly uses pulse step modulation (Pulse Step Modulation at present; Abbreviate as: PSM) mode is come audio signal modulation, and transmitting power commonly used is the emission type of 100kw, 150kw, 500kw.Wherein there is nonlinear distortion in the power amplifier of PSM modulation broadcast transmitter, and it is asymmetric that nonlinear distortion is mainly reflected in the positive negative peak of modulating the modulated signal of exporting, and this nonlinear distortion can be destroyed tonequality.
Prior art is the way compensating non-linear distortion by feedback compensation mainly, and a kind of method commonly used is with after the output sampling demodulation, sends into harmonic distortion and the intermodulation compensation unit compensates, and the signal after compensating is exported as final signal.Wherein backoff algorithm adopts Wal Thailand to draw the number compensation of three classes usually, by this feedback signal is done the compensating parameter of distinguishing and train input signal, is compensated by the output signal of this compensating parameter adjustment input signal to transmitter.Nonlinear distortion that by this method can compensating power amplifier.
But the processing resource that existing algorithm expends is more, and is also higher to the feedback sample required precision.
Summary of the invention
The embodiment of the invention provides a kind of precompensation method and device and transmitter of nonlinear distortion, expend the defective of handling the more and feedback sample precision of having relatively high expectations of resource when the compensating non-linear distortion in order to solve prior art, realize simple compensation nonlinear distortion.
The embodiment of the invention provides a kind of precompensation method of nonlinear distortion, comprising:
In the audio signal of input, obtain the sub-audio signal corresponding respectively with a plurality of default frequency ranges;
Obtain the amplitude of the carrier wave of the amplitude of a plurality of described sub-audio signals and described audio signal;
According to each described default frequency range correspondence, the adjustment parameter of storage in advance, the amplitude of the sub-audio signal corresponding and the amplitude of described carrier wave with each described default frequency range, each described sub-audio signal is carried out the amplitude adjustment, the nonlinear distortion that produces when directly modulating described audio signal with compensated pulse ladder modulation transmitter;
A plurality of sub-audio signals through the amplitude adjustment are added up, form the audio signal of adjusting through amplitude, and send to described pulse step modulation transmitter, so that described pulse step modulation transmitter carries out modulate emission to described audio signal through the amplitude adjustment.
The embodiment of the invention provides a kind of precompensation device of nonlinear distortion, comprising:
The sub-audio signal acquisition module is used for the audio signal in input, obtains the sub-audio signal corresponding with a plurality of default frequency ranges;
The amplitude acquisition module is used to obtain the amplitude of the carrier wave of the amplitude of a plurality of described sub-audio signals and described audio signal;
Amplitude adjusting module, be used for according to each described default frequency range correspondence, the adjustment parameter of storage in advance, the amplitude of the sub-audio signal corresponding and the amplitude of described carrier wave with each described default frequency range, each described sub-audio signal is carried out the amplitude adjustment, the nonlinear distortion that produces when directly modulating described audio signal with compensated pulse ladder modulation transmitter;
Signal transmitting module, be used for a plurality of sub-audio signals through the amplitude adjustment are added up, form the audio signal of adjusting through amplitude, and send to described pulse step modulation transmitter, so that described pulse step modulation transmitter carries out modulate emission to described audio signal through the amplitude adjustment.
The embodiment of the invention also provides a kind of transmitter, comprises the precompensation device of the nonlinear distortion that the embodiment of the invention provides.
The precompensation method of the nonlinear distortion of the embodiment of the invention and device and transmitter, according to default frequency range audio signal is divided into a plurality of sub-audio signals, the adjustment parameter of obtaining according to posivtive spike amplitude-versus-frequency curve corresponding then with a plurality of default frequency ranges by transmitter output, with the amplitude of the carrier wave of the amplitude of each sub-audio signal and audio signal each sub-audio signal is carried out the amplitude adjustment, with the adjusted a plurality of sub-audio signals of the amplitude adjusted audio signal of formation amplitude that adds up, carrying out precompensation with the nonlinear distortion that transmitter is caused handles, compared with prior art, it realizes simple, and does not need feedback circuit.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do one to the accompanying drawing of required use in embodiment or the description of the Prior Art below introduces simply, apparently, accompanying drawing in describing below is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the flow chart of precompensation method of the nonlinear distortion of the embodiment of the invention one;
The method flow diagram of parameter is adjusted in the generation that Fig. 2 provides for the embodiment of the invention one;
Fig. 3 is the flow chart of a kind of execution mode of step 13 among Fig. 1;
Fig. 4 is the posivtive spike amplitude-versus-frequency curve that the pulse step modulation transmitter of the not compensated processing of the embodiment of the invention two is exported;
The flow chart of the precompensation method of the nonlinear distortion that Fig. 5 provides for the embodiment of the invention two;
Fig. 6 is the posivtive spike amplitude-versus-frequency curve figure of the pulse step modulation transmitter after compensation deals of the embodiment of the invention two;
Fig. 7 is the oscillogram through the adjusted audio signal of side reaction coefficient of the embodiment of the invention two;
Fig. 8 be the embodiment of the invention two again through the oscillogram of the adjusted audio signal of beta coefficient;
Fig. 9 is the structural representation of precompensation device of the nonlinear distortion of the embodiment of the invention three.
Embodiment
For the purpose, technical scheme and the advantage that make the embodiment of the invention clearer, below in conjunction with the accompanying drawing in the embodiment of the invention, technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
Fig. 1 is the flow chart of precompensation method of the nonlinear distortion of the embodiment of the invention one, and the executive agent of present embodiment is the precompensation device of nonlinear distortion, and as shown in Figure 1, the precompensation method of present embodiment comprises:
Wherein, audio signal in the input precompensation device is the mixed signal that one kind of multiple frequencies are formed, be provided with a plurality of filters in the precompensation device, corresponding with a plurality of default frequency ranges respectively, be used for the audio signal of input is carried out filtering, to obtain the sub-audio signal corresponding respectively with a plurality of default frequency ranges.
This concrete step is that obtained according to step 12 by the precompensation device carries out amplitude adjustment processing with the amplitude corresponding respectively sub-audio signal of a plurality of default frequency ranges with the corresponding adjustment parameter of each sub-audio signal.Wherein, adjusting parameter is to adjust the required parameter of sub-audio signal, corresponding with the default frequency range under the sub-audio signal, the adjustment parameter that the sub-audio signal of different frequency range is corresponding different, the posivtive spike amplitude-frequency characteristic of adjusting parameter and be in advance according to the pulse step modulation transmitter is formed and stored in the memory space, described memory space can be the built-in memory space of precompensation device, also can be external memory space.
Concrete, because having carried out the amplitude adjustment, handles step 13 pair each sub-audio signal, each sub-audio signal of handling through amplitude adjustment added up obtain the audio signal adjusted through amplitude, then, to send into the pulse step modulation transmitter through the audio signal of amplitude adjustment, the posivtive spike and the negative peak that guarantee the signal that the pulse step modulation transmitter is exported are in a basic balance, i.e. the nonlinear distortion that causes with the amplitude compensated pulse ladder modulation transmitter that passes through the audio signal of adjusting.
The precompensation method of the nonlinear distortion that present embodiment provides, by the amplitude of obtaining sub-audio signal corresponding and adjustment parameter, sub-audio signal and the amplitude that modulates the carrier wave of audio signal each sub-audio signal is carried out the amplitude adjustment with default frequency range, to add up through a plurality of sub-audio signals of amplitude adjustment, accumulation result is sent into the pulse step modulation transmitter, with the nonlinear distortion of usefulness through the amplitude compensated pulse ladder modulation transmitter of the audio signal of adjustment.The precompensation method of present embodiment is different with existing compensation method, does not adopt the nonlinear distortion of feedback system paired pulses ladder modulation transmitter to compensate, and does not need complicated feedback circuit and algorithm, and the method for present embodiment realizes simple.
Further, needs generate the adjustment parameter in advance before adjustment parameter default frequency range correspondence according to each, storage in advance is carried out the amplitude adjustment to each sub-audio signal, and the method flow diagram of parameter is adjusted in the generation that Fig. 2 provides for the embodiment of the invention one.Present embodiment provides a kind of implementation of adjusting parameter that generates, and the adjustment parameter of present embodiment is that the posivtive spike amplitude-frequency characteristic according to the pulse step modulation transmitter generates, and specifically comprises:
It is example that present embodiment is divided into six frequency ranges with the passband with the pulse step modulation transmitter, be respectively: 80Hz is following, 80Hz～150Hz, 150Hz～1.5kHz, 1.5kHz～2.4kHz, 2.4k～3.2kHz, more than the 3.2kHz, usually the frequency of shortwave audio signal is 50Hz～5kHz, therefore, the frequency range of shortwave audio signal is in the scope that above-mentioned each frequency range covered.
This step is used for the corresponding adjustment parameter that generates above-mentioned each frequency range, specifically can obtain the adjustment parameter of frequency range correspondence according to the central point frequency of each frequency range, also can obtain the adjustment parameter of frequency range correspondence according to a plurality of Frequency points in the frequency range; For example can ask the adjustment parameter of average regeneration correspondence to the posivtive spike amplitude-frequency characteristic of a plurality of Frequency points in the frequency range.Because the posivtive spike amplitude-frequency characteristic of pulse step modulation transmitter can embody the nonlinear distortion degree, therefore, present embodiment generates the adjustment parameter based on the posivtive spike amplitude-frequency characteristic of pulse step modulation transmitter, and go that with this adjustment parameter each sub-audio signal in the audio signal of input is carried out the amplitude adjustment and handle, can guarantee the accuracy of compensating non-linear distortion.
Generating mode based on above-mentioned adjustment parameter, the acquisition process specific implementation of the adjustment parameter that step 13 is used in the present embodiment is: at first according to step 11 audio signal of input is carried out frequency range and divide, obtain the sub-audio signal corresponding with each default frequency range, for example can by with the corresponding many groups filter of default frequency range of the posivtive spike amplitude-frequency characteristic of the pulse step modulation transmitter of being divided, the audio signal of input is divided in the different frequency ranges, and the posivtive spike amplitude-frequency characteristic of corresponding each default frequency range generates required adjustment parameter then.
Further, present embodiment provides a kind of embodiment of step 13.Fig. 3 is the flow chart of a kind of execution mode of step 13 among Fig. 1, and this execution mode is realized based on technique scheme, specifically comprises:
A
o＝A
i×(A
c+α×A
i)÷A
c×β????(1)
Wherein, A
iAmplitude for the sub-audio signal; A
cAmplitude for carrier wave; α, β are the adjustment parameter that generates according to said method, A
oAdjusted amplitude for the sub-audio signal.
In this step, the precompensation device is adjusted to required amplitude with the amplitude of each sub-audio signal, and guarantees that other information of each sub-audio signal are constant, for example keeps original frequency, phase place etc.So far, finished the amplitude adjustment of each sub-audio signal has been handled.Then, in step 14, will add up and form the audio signal of adjusting through amplitude through each sub-audio signal that the amplitude adjustment is handled.
For further specifying technical scheme of the present invention, below embodiment be that the modulation of the single audio frequency signal of 1kHz is output as example and describes with the pulse step modulation transmitter to frequency:
Wherein, Fig. 4 is the posivtive spike amplitude-versus-frequency curve of the pulse step modulation transmitter output handled of the not compensated of the embodiment of the invention two.The flow chart of the precompensation method of the nonlinear distortion that Fig. 5 provides for the embodiment of the invention two.Fig. 6 is the posivtive spike amplitude-versus-frequency curve figure of the pulse step modulation transmitter after compensation deals of the embodiment of the invention two; Fig. 7 is the oscillogram through the adjusted audio signal of side reaction coefficient of the embodiment of the invention two; Fig. 8 is the oscillogram through the adjusted audio signal of beta coefficient of the embodiment of the invention two.
It is asymmetric that the nonlinear distortion of pulse step modulation transmitter is mainly reflected in the positive negative peak of modulated signal of modulating output, because the linearity of the low more transmitter of voltage is good more, therefore, is benchmark with the negative peak modulation degree.For example when the negative peak modulation degree is 90%, by as can be known shown in Figure 4, the modulation degree of posivtive spike also is not equal to or near 90%, but reduces along with the increase of frequency.And as shown in Figure 4, be 90% o'clock in the modulation degree of negative peak, frequency be the posivtive spike modulation degree of audio signal of 1kHz about 87%, present embodiment is an example with 87%.In order to overcome the nonlinear distortion of pulse step modulation transmitter, at first adopting technical solution of the present invention is that the audio signal of 1kHz is carried out the amplitude processing and amplifying to frequency, send into then and carry out modulate emission in the pulse step modulation transmitter, the handling process that concrete amplitude is amplified may further comprise the steps as shown in Figure 5:
The mode that present embodiment adopts the foregoing description to provide generates the adjustment parameter, to guarantee the accuracy of compensating non-linear distortion.Specific implementation process is: at first according to posivtive spike amplitude-versus-frequency curve shown in Figure 4, know that frequency is that the modulation degree of posivtive spike of the audio signal of 1kHz is 87%, than desirable modulation degree 90% low 3%, be increased to 93% based on this modulation degree, i.e. Ao=0.93A with posivtive spike
c, the modulation degree of negative peak is 90%, i.e. Ao=0.90A
c, and bring formula (1) respectively into, obtain formula (2) and formula (3), as follows:
0.93A
c＝0.90A
c×(A
c+0.90αA
c)÷A
c×β?????????(2)
-0.90A
c＝-0.90A
c×(A
c+(-0.90αA
c))÷A
c×β????(3)
Abbreviation and finding the solution obtains:
α＝0.0182；β＝1.017；
Based on the above-mentioned adjustment parameter of finding the solution, be that the audio signal of the 1kHz amplitude of carrying out is amplified back modulation output to frequency according to formula (1).Above-mentioned output result is done further analysis, find that the modulation degree of posivtive spike is still undesirable, then continue near 93%, to adjust the modulation degree of posivtive spike.Through repeatedly adjusting and test, find when the modulation degree of posivtive spike 93.3% the time, the modulation degree of the posivtive spike of pulse modulated demodulation transmitter output is comparatively desirable, then calculates according to this modulation degree and adjusts parameter, soon Ao=0.933A
c, Ao=0.90A
cBring formula (1) respectively into and obtain formula (4) and formula (5), as follows:
0.933A
c＝0.90A
c×(A
c+0.90αA
c)÷A
c×β????????(4)
-0.90A
c＝-0.90A
c×(A
c+(-0.90αA
c))÷A
c×β????(5)
Abbreviation also calculates:
α＝0.02；β＝1.01833；
According to value and the formula (1) of above-mentioned adjustment parameter alpha, β, be that the audio signal of the 1kHz amplitude of carrying out is amplified to frequency, and the value of parameter alpha, β is adjusted in storage.Can obtain the adjustment parameter of each default frequency range correspondence in the passband of pulse step modulation transmitter according to said method, and then know that the pulse step modulation transmitter connects the posivtive spike amplitude-frequency characteristic of output, as shown in Figure 6.
The posivtive spike amplitude-frequency characteristic how technique scheme has specifically been introduced according to the pulse step modulation transmitter generates the process of adjusting parameter, the operation that step 51 is described is carried out before other steps in the present embodiment, for example can carry out in advance according to concrete pulse step modulation transmitter, and will generate many groups adjust parameters and store in advance in the memory space, so that can directly call corresponding adjustment parameter when amplitude that each the sub-audio signal in the audio signal is carried out is amplified; After also can execution of step 51, and then carry out subsequent step.
Concrete, because this audio signal of hypothesis is the signal of single known frequency, therefore, directly know the frequency range at 1kHz place, promptly frequency range 150Hz～1.5kHz obtains i.e. the adjustment parameter and α=0.02 of this frequency range then; β=1.01833 are the adjustment parameter of the audio signal of 1kHz as frequency;
A
o＝A
i×(A
c+α×A
i)÷A
c????(6)
Calculate the modulation degree of posivtive spike according to formula (6):
A
o/A
c＝(0.90A
c×(A
c+0.02×0.90A
c)÷A
c)/A
c＝0.9162；
Calculate the modulation degree of negative peak according to formula (6):
A
o/A
c＝((-0.90A
c)×(A
c+0.02×(-0.90A
c))÷A
c)/A
c＝-0.8838；
After passing through formula (6) as can be seen, positive negative peak has all to the forward improved, and obtains waveform as shown in Figure 7, and wherein abscissa is the time, and ordinate is the amplitude through the adjusted audio signal of side reaction coefficient.Dotted line is the waveform of input audio signal among Fig. 7, and solid line is the waveform behind the peak compensation.Waveform after the above-mentioned processing does not reach the effect that we want, and therefore need do further processing.
Calculate the modulation degree of posivtive spike according to formula (1):
A
o/A
c＝0.9162×β＝0.9162×1.01833＝0.933；
Calculate the modulation degree of negative peak according to formula (6):
A
o/A
c＝0.8838×β＝-0.8838×1.01833＝0.90；
Pass through formula (1) back posivtive spike as can be seen and improved in advance, obtain waveform as shown in Figure 8, wherein abscissa is the time, and ordinate is the amplitude through the adjusted audio signal of beta coefficient.Dotted line is the waveform of input audio signal among the figure, and solid line is the waveform after the posivtive spike compensation.
The peak value of posivtive spike is improved in advance the asymmetric nonlinear distortion of positive negative peak that power amplifier that can compensation transmitter brings by above-mentioned steps.
The technical solution of the present invention simple possible, for further specifying the technique effect of technical solution of the present invention, the inventor is that the negative peak 90% of 11.665MHz audio signal is modulated to example and has carried out a large amount of tests with the carrier frequency, wherein table 1 is the distortion factor of posivtive spike under the compensating distortion degree situation not, and table 2 is the distortion factor of posivtive spike under the distortion factor situation of compensation back.
Table 1
| Carrier frequency | Frequency (Hz) | ??100 | ??200 | ??400 | ??800 | ??1K | ??2K | ??5K |
| ??11.665MHz | The distortion factor (%) | ??2.08 | ??1.77 | ??1.88 | ??1.66 | ??1.80 | ??2.40 | ??3.92 |
Table 2
| Carrier frequency | Frequency (Hz) | ??100 | ??200 | ??400 | ??800 | ??1K | ??2K | ??5K |
| ??11.665MHz | The distortion factor (%) | ??1.07 | ??0.90 | ??1.14 | ??1.09 | ??0.80 | ??1.47 | ??1.04 |
From data as can be seen, audio signal is not being compensated the distortion factor of transmitter under the situation between 1.5～4%, the distortion factor of transmitter is about 1% under audio signal process compensation adjustment situation, and above-mentioned test data has further been verified the technique effect of technical solution of the present invention.
Fig. 9 is the structural representation of precompensation device of the nonlinear distortion of the embodiment of the invention three, and the precompensation device of present embodiment can be arranged in the pulse step modulation transmitter, also can independently be provided with and is connected with the pulse step modulation transmitter.As shown in Figure 9, the precompensation device of present embodiment comprises: sub-audio signal acquisition module 91, amplitude acquisition module 92, amplitude adjusting module 93, signal transmitting module 94 and memory module 97.
Wherein, sub-audio signal acquisition module 91 is used for the audio signal in input, obtains the sub-audio signal corresponding with a plurality of default frequency ranges, and for example sub-audio signal acquisition module 91 can be made of a plurality of filters, and each filter is corresponding with a default frequency range.Amplitude acquisition module 92 is connected with sub-audio signal acquisition module 91, is used to obtain the amplitude of the carrier wave of the amplitude of a plurality of sub-audio signals and audio signal; The carrier wave that wherein is modulated into each sub-audio signal is identical, so the amplitude of carrier wave is same.
Signal transmitting module 94 is connected with amplitude adjusting module 93, be used for a plurality of sub-audio signals through the amplitude adjustment are added up, form the audio signal of adjusting through amplitude, and send to the pulse step modulation transmitter, so that the pulse step modulation transmitter carries out modulate emission to the audio signal of amplifying through amplitude.
The precompensation device of the nonlinear distortion of present embodiment, obtain each the sub-audio signal in each default frequency range corresponding audio signal and adjust parameter, and according to the amplitude of sub-audio signal, adjust parameter and the amplitude that is modulated into the carrier wave of audio signal, each sub-audio signal is carried out the amplitude adjustment, to add up through each sub-audio signal of amplitude adjustment, and accumulation result is sent to the pulse step modulation transmitter by the pulse step modulation transmitter the adjusted audio signal of amplitude is carried out modulate emission then, thereby the nonlinear distortion that produces when compensating direct modulate emission audio signal, compared with prior art, do not comprise complicated feedback circuit in the precompensation device of present embodiment, when implementing, do not need complicated feedback algorithm yet, can simply realize compensation the nonlinear distortion of transmitter.
Concrete, the amplitude adjusting module 93 in the present embodiment comprises amplitude computing unit 931 and amplitude adjustment unit 932.Amplitude computing unit 931 is used for according to formula A
o=A
i* (A
c+ α * A
i) ÷ A
c* β calculates adjusted amplitude; Amplitude adjustment unit 932 is used for the amplitude that should adjust to that calculates according to amplitude computing unit 931, corresponding sub-audio signal is carried out the amplitude adjustment handle, and adjusted each the sub-audio signal of amplitude is offered signal transmitting module 94.Concrete, amplitude adjustment unit 932 is adjusted to the amplitude that amplitude computing unit 931 calculates with the amplitude of each sub-audio signal, and guarantees that other information of each sub-audio signal are constant, for example keeps original frequency, phase place etc.So far, finished the amplitude adjustment of each sub-audio signal has been handled.
Further, the precompensation device of present embodiment also comprises: frequency range is divided module 95 and is adjusted parameter generation module 96.Frequency range is divided module 95 and is used for according to a plurality of default frequency ranges the posivtive spike amplitude-frequency characteristic of pulse step modulation transmitter being divided; Adjusting parameter generation module 96 is used for generating the adjustment parameter of each default frequency range correspondence according to the posivtive spike amplitude-frequency characteristic in each default frequency range.These two modules are used for generating in advance the adjustment parameter, and the adjustment parameter that will generate in advance stores in the memory module 97, adjust required for each the sub-audio signal in the audio signal being carried out amplitude.
The adjustment parameter of each frequency range correspondence generates according to the posivtive spike amplitude-frequency characteristic of pulse step modulation transmitter in the present embodiment, specifically can obtain the adjustment parameter of frequency range correspondence according to the central point frequency of each frequency range; Also can ask average adjustment parameter according to the adjustment parameter that a plurality of Frequency points are obtained as the frequency range correspondence.Because the posivtive spike amplitude-frequency characteristic of pulse step modulation transmitter can embody the nonlinear distortion degree, therefore audio signal is carried out the amplitude adjustment and handle based on the adjustment parameter that generates according to the posivtive spike amplitude-frequency characteristic, can guarantee the accuracy of compensating non-linear distortion.
Based on technique scheme, the precompensation device of present embodiment at first obtains in the audio signal of input each sub-audio signal corresponding to default frequency range by sub-audio signal acquisition module 91, obtain then that parameter generation module 96 generates by adjusting, the adjustment parameter corresponding with each default frequency range, this is adjusted parameter as adjusting the required adjustment parameter of each sub-audio signal, realization is handled the amplitude adjustment of each sub-audio signal, and then realize the amplitude adjustment of audio signal is handled, with the nonlinear distortion of amplitude compensated pulse modulation transmitter through adjusting the audio signal after handling.
The embodiment of the invention three provides a kind of transmitter, and the transmitter of present embodiment comprises the precompensation device of the nonlinear distortion that the foregoing description provides, and wherein transmitter also comprises emitter.Transmitter is used for after the precompensation device amplitude of audio signal being carried out according to the posivtive spike amplitude-frequency characteristic of transmitter emitter is adjusted, by emitter to modulating through the adjusted audio signal of amplitude and launching.
The transmitter of present embodiment comprises the precompensation device of the nonlinear distortion that the foregoing description provides, by in advance audio signal being carried out the amplitude adjustment, the nonlinear distortion that emitter causes is carried out precompensation, compensated the nonlinear distortion that existing transmitter exists when the modulate emission audio signal, improved precision the audio signal modulate emission.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be finished by the relevant hardware of program command, aforesaid program can be stored in the computer read/write memory medium, this program is carried out the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
It should be noted that at last: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (7)
1. the precompensation method of a nonlinear distortion is characterized in that, comprising:
In the audio signal of input, obtain the sub-audio signal corresponding respectively with a plurality of default frequency ranges;
Obtain the amplitude of the carrier wave of the amplitude of a plurality of described sub-audio signals and described audio signal;
According to each described default frequency range correspondence, the adjustment parameter of storage in advance, the amplitude of the sub-audio signal corresponding and the amplitude of described carrier wave with each described default frequency range, each described sub-audio signal is carried out the amplitude adjustment, the nonlinear distortion that produces when directly modulating described audio signal with compensated pulse ladder modulation transmitter;
A plurality of sub-audio signals through the amplitude adjustment are added up, form the audio signal of adjusting through amplitude, and send to described pulse step modulation transmitter, so that described pulse step modulation transmitter carries out modulate emission to described audio signal through the amplitude adjustment.
2. the precompensation method of nonlinear distortion according to claim 1 is characterized in that, described sub-audio signal carries out also comprising before the amplitude adjustment to each in adjustment parameter default frequency range correspondence according to each, storage in advance:
Be divided into according to the posivtive spike amplitude-frequency characteristic of a plurality of described default frequency ranges described pulse step modulation transmitter;
According to the posivtive spike amplitude-frequency characteristic in each described default frequency range, generate the adjustment parameter of each described default frequency range correspondence.
3. the precompensation method of nonlinear distortion according to claim 1 and 2, it is characterized in that, according to each described default frequency range correspondence, the adjustment parameter of storage in advance, the amplitude of the sub-audio signal corresponding and the amplitude of described carrier wave with each described default frequency range, each described sub-audio signal is carried out the amplitude adjustment is specially:
According to formula A
o=A
i* (A
c+ α * A
i) ÷ A
c* β calculates adjusted amplitude;
According to adjusted amplitude, each described sub-audio signal is carried out the amplitude adjustment;
Wherein, A
iAmplitude for described sub-audio signal;
A
cAmplitude for described carrier wave;
α, β are described adjustment parameter;
A
oBe adjusted amplitude.
4. the precompensation device of a nonlinear distortion is characterized in that, comprising:
The sub-audio signal acquisition module is used for the audio signal in input, obtains the sub-audio signal corresponding with a plurality of default frequency ranges;
The amplitude acquisition module is used to obtain the amplitude of the carrier wave of the amplitude of a plurality of described sub-audio signals and described audio signal;
Amplitude adjusting module, be used for according to each described default frequency range correspondence, the adjustment parameter of storage in advance, the amplitude of the sub-audio signal corresponding and the amplitude of described carrier wave with each described default frequency range, each described sub-audio signal is carried out the amplitude adjustment, the nonlinear distortion that produces when directly modulating described audio signal with compensated pulse ladder modulation transmitter;
Signal transmitting module, be used for a plurality of sub-audio signals through the amplitude adjustment are added up, form the audio signal of adjusting through amplitude, and send to described pulse step modulation transmitter, so that described pulse step modulation transmitter carries out modulate emission to described audio signal through the amplitude adjustment.
5. the precompensation device of nonlinear distortion according to claim 4 is characterized in that, also comprises:
Frequency range is divided module, is used for a plurality of described default frequency ranges the posivtive spike amplitude-frequency characteristic of described pulse step modulation transmitter is divided;
Adjust the parameter generation module, be used for generating the adjustment parameter of each described default frequency range correspondence according to the posivtive spike amplitude-frequency characteristic in each described default frequency range.
6. according to the precompensation device of claim 4 or 5 described nonlinear distortions, it is characterized in that described amplitude adjusting module comprises:
The amplitude computing unit is used for according to formula A
o=A
i* (A
c+ α * A
i) ÷ A
c* β calculates adjusted amplitude;
Amplitude adjustment unit is used for according to adjusted amplitude, and described sub-audio signal is carried out the amplitude adjustment;
Wherein, A
iAmplitude for described sub-audio signal;
A
cAmplitude for described carrier wave;
α, β are described adjustment parameter;
A
oBe adjusted amplitude.
7. a transmitter is characterized in that, comprises the precompensation device as each described nonlinear distortion of claim 4-6.
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|---|---|---|---|
| CN201010102575A CN101827054B (en) | 2010-01-27 | 2010-01-27 | Precompensation method and device of nonlinear distortion and transmitter |
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| CN201010102575A CN101827054B (en) | 2010-01-27 | 2010-01-27 | Precompensation method and device of nonlinear distortion and transmitter |
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| CN101827054A true CN101827054A (en) | 2010-09-08 |
| CN101827054B CN101827054B (en) | 2012-10-17 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107994923A (en) * | 2017-11-03 | 2018-05-04 | 京信通信系统（中国）有限公司 | Ultra-broadband digital pre-distortion method, device and system |
| CN108600915A (en) * | 2018-08-09 | 2018-09-28 | 歌尔科技有限公司 | A kind of method, apparatus of audio output, harmonic distortion filtering equipment and terminal |
| CN113395127A (en) * | 2021-07-13 | 2021-09-14 | 伟乐视讯科技股份有限公司 | Emergency broadcast RDS modulation degree test method and system |
| CN117134783A (en) * | 2023-10-27 | 2023-11-28 | 高拓讯达(北京)微电子股份有限公司 | Pre-compensation method and device for transmitter signal, electronic equipment and storage medium |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20070065375A (en) * | 2004-09-14 | 2007-06-22 | 코닌클리즈케 필립스 일렉트로닉스 엔.브이. | Arrangement for pulse-width modulating an input signal |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107994923A (en) * | 2017-11-03 | 2018-05-04 | 京信通信系统（中国）有限公司 | Ultra-broadband digital pre-distortion method, device and system |
| CN108600915A (en) * | 2018-08-09 | 2018-09-28 | 歌尔科技有限公司 | A kind of method, apparatus of audio output, harmonic distortion filtering equipment and terminal |
| CN108600915B (en) * | 2018-08-09 | 2024-02-06 | 歌尔科技有限公司 | Audio output method and device, harmonic distortion filtering equipment and terminal |
| CN113395127A (en) * | 2021-07-13 | 2021-09-14 | 伟乐视讯科技股份有限公司 | Emergency broadcast RDS modulation degree test method and system |
| CN113395127B (en) * | 2021-07-13 | 2022-03-18 | 伟乐视讯科技股份有限公司 | Emergency broadcast RDS modulation degree test method and system |
| CN117134783A (en) * | 2023-10-27 | 2023-11-28 | 高拓讯达(北京)微电子股份有限公司 | Pre-compensation method and device for transmitter signal, electronic equipment and storage medium |
| CN117134783B (en) * | 2023-10-27 | 2024-01-30 | 高拓讯达(北京)微电子股份有限公司 | Pre-compensation method and device for transmitter signal, electronic equipment and storage medium |
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| CN101827054B (en) | 2012-10-17 |
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