CN104125185A - Signal processing method and apparatus thereof - Google Patents
Signal processing method and apparatus thereof Download PDFInfo
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- CN104125185A CN104125185A CN201310155448.6A CN201310155448A CN104125185A CN 104125185 A CN104125185 A CN 104125185A CN 201310155448 A CN201310155448 A CN 201310155448A CN 104125185 A CN104125185 A CN 104125185A
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Abstract
An embodiment of the invention relates to a signal processing method and an apparatus thereof. The method comprises the following steps that an amplitude-limiting initial signal sent by a sending terminal is received, wherein the amplitude-limiting initial signal is sent after the sending terminal carries out amplitude limiting processing on a source signal; fast Fourier transform is performed on the amplitude-limiting initial signal so that a first frequency domain signal corresponding to the amplitude-limiting initial signal is acquired; inverse fast Fourier transform is performed on the first frequency domain signal so that a time domain signal corresponding to the first frequency domain signal is acquired; the amplitude limiting processing is performed on the time domain signal and the fast Fourier transform is performed on the time domain signal after the amplitude limiting again so as to acquire a second frequency domain signal corresponding to the time domain signal after the amplitude limiting; the second frequency domain signal is compared to the first frequency domain signal so as to acquire a frequency domain compensation coefficient value; the frequency domain compensation coefficient value is used to compensate the first frequency domain signal.
Description
Technical field
The present invention relates to communication field, relate in particular to a kind of method and apparatus of signal processing.
Background technology
OFDM (Orthogonal Frequency Division Multiplexing, be called for short: OFDM) technology is a kind of multi-carrier modulation technology, have that the availability of frequency spectrum is high, the characteristic of anti-multipath fading and frequency selective fading, be widely used in various types of wireless communication systems.
In time domain, because OFDM symbol is to be independently added and to obtain through the sub-carrier signal of ovennodulation by multiple, make composite signal just may produce the larger peak power of relative signal mean value, bring thus larger papr (Peak to Average Power Ratio, be called for short peak-to-average force ratio PAPR), that is:
wherein mean{} represents the mean value of signal; x
nfor each sub-carrier signal in OFDM.
Because PAPR value in existing ofdm system is too high, to power amplifier, mould/number conversion, the dynamic range of D/A switch device has proposed higher requirement, otherwise, the non-linear nonlinear distortion that causes of device, the harmonic wave of generation causes interchannel interference, the error rate of system increases, and affects systematic function.
Current, in the prior art, transmitting terminal is by carrying out amplitude limit to source signal, and then reduce PAPR value, because transmitting terminal is after to source signal amplitude limit, source signal can lose certain crest in time domain, the crest of being cut down in these time domains is mapped on frequency domain, can in each subcarrier data amplitude of ofdm signal and phase place, change source signal, carry out demodulation process on receiving terminal in, increase error code.Therefore, transmitting terminal is in carrying out amplitude limit to source signal, record the value that whether crest of each sampled point loses and lose in time domain, first signal as shown in Fig. 1 (a), and the signal of regeneration and the same length of source signal, secondary signal as shown in Fig. 1 (b), first signal and secondary signal are sent to receiving terminal, receiving terminal merges first signal and secondary signal in time domain, restore the original source signal of transmitting terminal, receiving terminal carries out fast Fourier transform, demodulation, decoding etc. to the source signal after reduction again, as shown in Figure 2.
The scheme of prior art reduces the impact of amplitude limit on source signal to the full extent, but this can make source signal be sent at twice receiving terminal, source signal transmits at twice, increase the contributive rate of interchannel noise to source signal, particularly to peak signal, the error rate is increased, the subsequent treatment of receiving terminal is brought to very large impact.
Summary of the invention
The embodiment of the present invention provides a kind of method and apparatus of signal processing, compensates to the received signal at receiving terminal in order to realize, and improves communication efficiency, reduces the error rate.
In first aspect, the embodiment of the present invention provides a kind of method of signal processing, and described method comprises:
Receiving end/sending end carries out the amplitude limit initialize signal sending after amplitude limiting processing to source signal;
Described amplitude limit initialize signal is carried out to fast Fourier transform, obtain first frequency-region signal corresponding with described amplitude limit initialize signal;
Described the first frequency-region signal is carried out to Fast Fourier Transform Inverse, obtain the time-domain signal corresponding with described the first frequency-region signal;
Described time-domain signal is carried out to amplitude limiting processing, and the described time-domain signal after amplitude limit is carried out to fast Fourier transform again, obtain second frequency-region signal corresponding with described time-domain signal after amplitude limit;
Described the second frequency-region signal and described the first frequency-region signal are compared, obtain frequency domain compensation coefficient value;
Utilize described frequency domain compensation coefficient value to compensate described the first frequency-region signal.
In the possible implementation of the first, described described amplitude limit initialize signal is carried out after fast Fourier transform, before described the first frequency-region signal is carried out to Fast Fourier Transform Inverse, also comprise:
To the demodulation of decoding of described the first frequency-region signal, obtain decoded signal;
Described decoded signal is carried out to coded modulation, obtain the first frequency-region signal after decoding demodulation and coded modulation, described the first frequency-region signal is specially the frequency-region signal through decoding demodulation and coded modulation process;
Describedly described the first frequency-region signal carried out to Fast Fourier Transform Inverse comprise:
Described the first frequency-region signal after decoding demodulation and coded modulation is carried out to Fast Fourier Transform Inverse.
In conjunction with the possible implementation of the first of first aspect or first aspect, in the possible implementation of the second, before the amplitude limit initialize signal that described reception is undertaken sending after amplitude limiting processing by transmitting terminal, also comprise:
Obtain described transmitting terminal described source signal carried out the coded format of coded modulation processing and described transmitting terminal described source signal is carried out the amplitude gate limit value of amplitude limiting processing from described transmitting terminal;
Described to the demodulation of decoding of described the first frequency-region signal, obtain decoded signal and comprise:
The described coded format that utilization is obtained, to the demodulation of decoding of described the first frequency-region signal, obtains decoded signal;
Described described decoded signal is carried out to coded modulation, the first frequency-region signal obtaining after decoding demodulation and coded modulation comprises:
The described coded format that utilization is obtained is carried out coded modulation to described decoded signal, obtains the first frequency-region signal after decoding demodulation and coded modulation;
Describedly described time-domain signal carried out to amplitude limiting processing comprise:
The described amplitude gate limit value that utilization is obtained, carries out amplitude limiting processing to described time-domain signal.
In the third possible implementation, described described the second frequency-region signal and described the first frequency-region signal are compared, obtain frequency domain compensation coefficient value and comprise:
Described the second frequency-region signal and described the first frequency-region signal are subtracted each other or process of convolution, obtain frequency domain compensation coefficient value.
In the 4th kind of possible implementation, describedly utilize described frequency domain compensation coefficient value that described the first frequency-region signal is compensated and comprised:
By the compensation that superposes of described the first frequency-region signal and described frequency domain compensation coefficient value;
Described method also comprises: described the first frequency-region signal after compensating is decoded after demodulation and exported.
In second aspect, the embodiment of the present invention provides a kind of device of signal processing, and described device comprises:
Receiving element, carries out the amplitude limit initialize signal sending after amplitude limiting processing to source signal for receiving end/sending end;
Fast Fourier transform unit, for described amplitude limit initialize signal is carried out to fast Fourier transform, obtains first frequency-region signal corresponding with described amplitude limit initialize signal;
Fast Fourier Transform Inverse unit, for described the first frequency-region signal is carried out to Fast Fourier Transform Inverse, obtains the time-domain signal corresponding with described the first frequency-region signal;
Amplitude limit unit, for carrying out amplitude limiting processing to described time-domain signal;
Described fast Fourier transform unit also for, the described time-domain signal after amplitude limit is carried out to fast Fourier transform again, obtain second frequency-region signal corresponding with described time-domain signal after amplitude limit;
Comparing unit, for described the second frequency-region signal and described the first frequency-region signal are compared, obtains frequency domain compensation coefficient value;
Compensating unit, for utilizing described frequency domain compensation coefficient value to compensate described the first frequency-region signal.
In the possible implementation of the first, described device also comprises: decoding demodulating unit, for demodulation that described the first frequency-region signal is decoded, obtains decoded signal;
Coded modulation unit, for described decoded signal is carried out to coded modulation, obtains the first frequency-region signal after decoding demodulation and coded modulation, and described the first frequency-region signal is specially the frequency-region signal through decoding demodulation and coded modulation process;
Described Fast Fourier Transform Inverse unit also for, described the first frequency-region signal after decoding demodulation and coded modulation is carried out to Fast Fourier Transform Inverse.
In conjunction with the first possibility implementation of second aspect or second aspect, in the possible implementation of the second, described device also comprises:
Acquiring unit, carries out the coded format of coded modulation processing and described transmitting terminal described source signal is carried out the amplitude gate limit value of amplitude limiting processing to described source signal for obtain described transmitting terminal from described transmitting terminal;
Described decoding demodulating unit also for, utilize the described coded format obtained to the demodulation of decoding of described the first frequency-region signal, obtain decoded signal;
Described coded modulation unit also for, utilize the described coded format obtained to carry out coded modulation to the described decoded signal of decoding after demodulation through described decoding demodulating unit, obtain the first frequency-region signal after decoding demodulation and coded modulation;
Described amplitude limit unit also for, utilize the described amplitude gate limit value that obtains, described time-domain signal is carried out to amplitude limiting processing.
In the third possible implementation, described comparing unit also for, described the second frequency-region signal and described the first frequency-region signal are subtracted each other or process of convolution, obtain frequency domain compensation coefficient value.
May implementation in conjunction with the first of second aspect or second aspect, in the 4th kind of possible implementation, described compensating unit also for, by the compensation that superposes of described the first frequency-region signal and described frequency domain compensation coefficient value;
Described decoding demodulating unit also for, described the first frequency-region signal after compensating is decoded after demodulation and is exported.
Therefore, the method and apparatus of the signal processing providing by the application embodiment of the present invention, receiving terminal carries out after FFT conversion amplitude limit initialize signal, carry out IFFT conversion and amplitude limiting processing, obtain frequency domain compensation coefficient value, the frequency domain compensation coefficient value obtaining and the amplitude limit initialize signal after FFT conversion are superposeed, and then realize the effect that receiving terminal compensates amplitude limit initialize signal, improve communication efficiency, reduce the error rate.
Brief description of the drawings
Fig. 1 (a) is first signal schematic diagram in prior art;
Fig. 1 (b) is secondary signal schematic diagram in prior art;
Fig. 2 is receiving terminal reduction source signal schematic diagram in prior art;
The method flow diagram of the signal processing that Fig. 3 provides for the embodiment of the present invention;
The device schematic diagram of the signal processing that Fig. 4 provides for the embodiment of the present invention;
The device hardware schematic diagram of the signal processing that Fig. 5 provides for the embodiment of the present invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing, the specific embodiment of the invention is described in further detail.
In embodiments of the present invention, transmitting terminal carries out transmitting after amplitude limit to source signal, and due in the situation that signal to noise ratio is higher, the amplitude limit initialize signal after amplitude limit is subject to channel noise effect smaller, can recover largely original source signal state.Reappear according to signal probability of occurrence, receiving terminal to receive after amplitude limit initialize signal through fast Fourier transform (Fast Fourier Transformation, FFT), Fast Fourier Transform Inverse (Inverse Fast Fourier Transformation be called for short:, be called for short: IFFT), form new time-domain signal, the sample point being limited at transmitting terminal like this has greater probability to there will be new peak value.Therefore,, according to this characteristic, receiving terminal again carries out amplitude limit operation and after FFT conversion, obtains frequency domain compensation coefficient value time-domain signal.This frequency domain compensation coefficient value and amplitude limit initialize signal are superposeed, realize amplitude limit initialize signal is compensated.Owing at receiving terminal, amplitude limit initialize signal being compensated, and then the receptivity of raising receiving terminal.
The method of the signal processing that provides of the explanation embodiment of the present invention as an example of Fig. 3 example below, the method flow diagram of the signal processing that Fig. 3 provides for the embodiment of the present invention, subject of implementation is receiving terminal in embodiments of the present invention.As shown in Figure 3, this embodiment comprises the following steps:
Step 310, receiving end/sending end carry out the amplitude limit initialize signal sending after amplitude limiting processing to source signal.
Particularly, transmitting terminal carries out amplitude limiting processing to source signal, obtains amplitude limit initialize signal, and transmitting terminal sends this amplitude limit initialize signal to receiving terminal, and receiving terminal receives and carries out by transmitting terminal the amplitude limit initialize signal sending after amplitude limiting processing.
If the time-domain signal of transmitting terminal after amplitude limit is: C '
i=C
i+ D
i;
, the received amplitude limit initialize signal of receiving terminal is: Y '
i=H
i* C '
i+ N
i, wherein, i=0,1 ..., N-1.
Wherein, C
ifor transmitting terminal initialization signal, D
ifor the signal of losing after transmitting terminal amplitude limiting processing, H
ifor channel impulse response, N
ifor the noise signal in channel.
Step 320, described amplitude limit initialize signal is carried out after fast Fourier transform, obtain first frequency-region signal corresponding with described amplitude limit initialize signal.
Particularly, receiving terminal is to amplitude limit initialize signal Y '
icarry out FFT conversion, obtain and amplitude limit initialize signal Y '
ithe first corresponding frequency-region signal Y "
i.Described FFT is transformed to prior art, no longer repeats at this.
Step 330, described the first frequency-region signal is carried out after Fast Fourier Transform Inverse, obtain the time-domain signal corresponding with described the first frequency-region signal.
Particularly, receiving terminal is to the first frequency-region signal Y "
icarry out after IFFT conversion, obtain and the first frequency-region signal Y "
icorresponding time-domain signal F
i.Described IFFT is transformed to prior art, no longer repeats at this.
Step 340, described time-domain signal is carried out to amplitude limiting processing, and the described time-domain signal after amplitude limit is carried out after fast Fourier transform again, obtain second frequency-region signal corresponding with described time-domain signal after amplitude limit.
Particularly, receiving terminal is to time-domain signal F
icarry out amplitude limiting processing, and to the time-domain signal F after amplitude limit
iagain carry out, after fast Fourier transform, obtaining and time-domain signal F
ithe second corresponding frequency-region signal G
i.
Further, described amplitude limiting processing is specially all instantaneous values that certain specific character of input signal (for example voltage, electric current, power) is exceeded to predetermined threshold and weakens to approaching this threshold value, and the operation that other all instantaneous values are retained.
Step 350, described the second frequency-region signal and described the first frequency-region signal are compared, obtain frequency domain compensation coefficient value.
Particularly, receiving terminal is obtaining the second frequency-region signal G
iafter, by the second frequency-region signal G
iwith the first frequency-region signal Y "
icompare, obtain frequency domain compensation coefficient
Further, described the second frequency-region signal and described the first frequency-region signal are compared, obtain frequency domain compensation coefficient value and specifically comprise: by the second frequency-region signal G
iwith the first frequency-region signal Y "
isubtract each other or process of convolution, obtain frequency domain compensation coefficient value
In an example, by the second frequency-region signal G
iwith the first frequency-region signal Y "
isubtract each other, obtain frequency domain compensation coefficient value
wherein, i=0,1 ..., N-1.
Step 360, utilize described frequency domain compensation coefficient value to compensate described the first frequency-region signal.
Particularly, receiving terminal is obtaining frequency domain compensation coefficient value
after, utilize frequency domain compensation coefficient value
to the first frequency-region signal Y "
icompensate.
Further, receiving terminal utilizes frequency domain compensation coefficient value
to the first frequency-region signal Y "
icompensate specifically and comprise: receiving terminal is by the first frequency-region signal Y "
iwith frequency domain compensation coefficient value
the compensation that superposes, the first frequency-region signal after being compensated
wherein, i=0,1 ..., N-1.
Be understandable that the first frequency-region signal after the compensation that receiving terminal obtains
be receiving terminal according to the amplitude limit initialize signal Y ' receiving
ithe source signal restoring.
Alternatively, before embodiment of the present invention step 330, also comprise, receiving terminal is to the first frequency-region signal Y "
idecode demodulation and coded modulation, by the first frequency-region signal Y "
idemodulation and the coded modulation of decoding can the error rate to data be identified in the process of carrying out emulation.
Receiving terminal, to the demodulation of decoding of described the first frequency-region signal, obtains decoded signal.
Particularly, receiving terminal is to the first frequency-region signal Y "
ithe demodulation of decoding, obtains decoded signal B
i.
Further, receiving terminal obtains decoded signal B
iafter, by decoded signal B
iput into buffer, so that subsequent step is to decoded signal B
iwhile processing, from buffer, obtain decoded signal B
i.
Described decoded signal is carried out coded modulation by receiving terminal, obtains the first frequency-region signal after decoding demodulation and coded modulation.
Particularly, receiving terminal is by decoded signal B
icarry out coded modulation, it is identical that this coded modulation is processed the coded format of source signal being carried out to coded modulation processing with transmitting terminal, obtains the first frequency-region signal Y after decoding demodulation and coding carving system " '
i.
Further, receiving terminal obtains decoded signal B from buffer
i, to decoded signal B
icarry out coded modulation, obtain the first frequency-region signal Y after decoding demodulation and coded modulation " '
i.
It should be noted that, receiving terminal is to the first frequency-region signal Y "
idecode after demodulation, by decoded signal B
ican put into buffer, buffer can be by decoded signal B
icopy rear output, the decoded signal B after copying
ibe stored in buffer.Receiving terminal is by the decoded signal B after copying
icarry out coded modulation, obtain the first frequency-region signal Y after decoding demodulation and coded modulation " '
i.
In embodiments of the present invention, the first frequency-region signal Y " '
ibe specially the frequency-region signal through decoding demodulation and coded modulation process.
Alternatively, carrying out after above-mentioned decoding demodulation and code modulated step, step 330 is carried out Fast Fourier Transform Inverse to described the first frequency-region signal and is specially: described the first frequency-region signal after decoding demodulation and coded modulation is carried out to Fast Fourier Transform Inverse.
Particularly, receiving terminal is to the first frequency-region signal Y after decoding demodulation and coded modulation " '
icarry out Fast Fourier Transform Inverse.
Alternatively, before embodiment of the present invention step 310, also comprise the coded format that receiving terminal obtains transmitting terminal and source signal carried out to coded modulation processing from transmitting terminal, and source signal is carried out to the amplitude gate limit value of amplitude limiting processing, receiving terminal is by obtaining above-mentioned information, and then processes accordingly in aforesaid decoding demodulation, coded modulation and step 340.
Obtain described transmitting terminal described source signal carried out the coded format of coded modulation processing and described transmitting terminal described source signal is carried out the amplitude gate limit value of amplitude limiting processing from described transmitting terminal.
Particularly, receiving terminal obtains transmitting terminal source signal is carried out the coded format of coded modulation processing and transmitting terminal source signal is carried out the amplitude gate limit value of amplitude limiting processing from transmitting terminal.
Further, in one implementation, receiving terminal, in the time adding communication network, obtains above-mentioned information by the active broadcast of transmitting terminal.
Or in another kind of implementation, receiving terminal is adding after communication network, send parameter request message to transmitting terminal, reply message by the parameter of transmitting terminal and obtain above-mentioned information.
Alternatively, aforementioned receiving terminal, to the demodulation of decoding of described the first frequency-region signal, obtains decoded signal and comprises: the coded format that receiving terminal utilization is obtained is to the first frequency-region signal Y "
ithe demodulation of decoding, obtains decoded signal B
i.
Alternatively, described decoded signal is carried out coded modulation by aforementioned receiving terminal, obtains treating that contrast signal comprises: the coded format that receiving terminal utilization is obtained is to decoded signal B
icarry out coded modulation, obtain the first frequency-region signal Y after decoding demodulation and coded modulation " '
i.
Alternatively, in step 340, receiving terminal carries out amplitude limiting processing to described time-domain signal and comprises: the amplitude gate limit value that receiving terminal utilization is obtained, and to time-domain signal F
icarry out amplitude limiting processing.
Alternatively, after embodiment of the present invention step 360, described method also comprises: described the first frequency-region signal superposeing after compensation is decoded after demodulation and exported.
Particularly, receiving terminal is by the first frequency-region signal superposeing after compensation
decode after demodulation and export, so that carry out follow-up processing.
Therefore, the method of the signal processing providing by the application embodiment of the present invention, receiving terminal carries out, after FFT conversion, carrying out IFFT conversion and amplitude limiting processing to amplitude limit initialize signal, obtains frequency domain compensation coefficient value, the frequency domain compensation coefficient value obtaining and the amplitude limit initialize signal after FFT conversion are superposeed, and then realize the effect that receiving terminal compensates amplitude limit initialize signal, meanwhile, also avoid the problem occurring in prior art, improve communication efficiency, reduce the error rate.
Correspondingly, the embodiment of the present invention also provides a kind of device of signal processing, in order to realize the method for the signal processing in previous embodiment, as shown in Figure 4, described device comprises: receiving element 410, fast Fourier transform unit 420, Fast Fourier Transform Inverse unit 430, amplitude limit unit 440, comparing unit 450 and compensating unit 460.
Receiving element 410 in described device, carries out the amplitude limit initialize signal sending after amplitude limiting processing to source signal for receiving end/sending end;
Fast Fourier transform unit 420, for described amplitude limit initialize signal is carried out to fast Fourier transform, obtains first frequency-region signal corresponding with described amplitude limit initialize signal;
Fast Fourier Transform Inverse unit 430, for described the first frequency-region signal is carried out to Fast Fourier Transform Inverse, obtains the time-domain signal corresponding with described the first frequency-region signal;
Amplitude limit unit 440, for carrying out amplitude limiting processing to described time-domain signal;
Described fast Fourier transform unit 420 also for, the described time-domain signal after amplitude limit is carried out to fast Fourier transform again, obtain second frequency-region signal corresponding with described time-domain signal after amplitude limit;
Comparing unit 450, for described the second frequency-region signal and described the first frequency-region signal are compared, obtains frequency domain compensation coefficient value;
Compensating unit 460, for utilizing described frequency domain compensation coefficient value to compensate described the first frequency-region signal.
Described device also comprises: decoding demodulating unit 470, for demodulation that described the first frequency-region signal is decoded, obtains decoded signal;
Coded modulation unit 480, for described decoded signal is carried out to coded modulation, obtains the first frequency-region signal after decoding demodulation and coded modulation, and described the first frequency-region signal is specially the frequency-region signal through decoding demodulation and coded modulation process;
Described Fast Fourier Transform Inverse unit 430 also for, described the first frequency-region signal after decoding demodulation and coded modulation is carried out to Fast Fourier Transform Inverse.
Described device also comprises: acquiring unit 490, carries out the coded format of coded modulation processing and described transmitting terminal described source signal is carried out the amplitude gate limit value of amplitude limiting processing to described source signal for obtain described transmitting terminal from described transmitting terminal;
Described decoding demodulating unit 470 also for, utilize the described coded format obtained to the demodulation of decoding of described the first frequency-region signal, obtain decoded signal;
Described coded modulation unit 480 also for, utilize the described coded format obtained to carry out coded modulation to the described decoded signal of decoding after demodulation through described decoding demodulating unit, obtain the first frequency-region signal after decoding demodulation and coded modulation;
Described amplitude limit unit 440 also for, utilize the described amplitude gate limit value that obtains, described time-domain signal is carried out to amplitude limiting processing.
Described comparing unit 450 also for, described the second frequency-region signal and described the first frequency-region signal are subtracted each other or process of convolution, obtain frequency domain compensation coefficient value.
Described compensating unit 460 also for, by the compensation that superposes of described the first frequency-region signal and described frequency domain compensation coefficient value;
Described decoding demodulating unit 470 also for, described the first frequency-region signal after compensating is decoded after demodulation and is exported.
Therefore, the device of the signal processing providing by application the invention process, receiving terminal carries out after FFT conversion amplitude limit initialize signal, carry out IFFT conversion and amplitude limiting processing, obtain frequency domain compensation coefficient value, the frequency domain compensation coefficient value obtaining and the amplitude limit initialize signal after FFT conversion are superposeed, and then realize the effect that receiving terminal compensates amplitude limit initialize signal, improve communication efficiency, reduce the error rate.
In addition, the device of the signal processing that the embodiment of the present invention provides also can be realized by following form, in order to realize the method for the signal processing in previous embodiment of the present invention, as shown in Figure 5, described device comprises: network interface 510, processor 520 and memory 530.
Network interface 510 is for carrying out interactive communication with the transmitting terminal of communication network.
Memory 530 can be permanent memory, and for example hard disk drive and flash memory have software module and device driver in memory 530.Software module can be carried out the various functional modules of said method of the present invention; Device driver can be network and interface drive program.
In the time starting, these component softwares are loaded in memory 530, are then accessed and carry out as given an order by processor 520:
Receiving end/sending end carries out the amplitude limit initialize signal sending after amplitude limiting processing to source signal;
Described amplitude limit initialize signal is carried out to fast Fourier transform, obtain first frequency-region signal corresponding with described amplitude limit initialize signal;
Described the first frequency-region signal is carried out to Fast Fourier Transform Inverse, obtain the time-domain signal corresponding with described the first frequency-region signal;
Described time-domain signal is carried out to amplitude limiting processing, and the described time-domain signal after amplitude limit is carried out to fast Fourier transform again, obtain second frequency-region signal corresponding with described time-domain signal after amplitude limit;
Described the second frequency-region signal and described the first frequency-region signal are compared, obtain frequency domain compensation coefficient value;
Utilize described frequency domain compensation coefficient value to compensate described the first frequency-region signal.
Further, after the component software of described processor 520 references to storage 530, carry out the instruction of following process:
To the demodulation of decoding of described the first frequency-region signal, obtain decoded signal;
Described decoded signal is carried out to coded modulation, obtain the first frequency-region signal after decoding demodulation and coded modulation, described the first frequency-region signal is specially the frequency-region signal through decoding demodulation and coded modulation process;
Further, after the component software of described processor 520 references to storage 530, carry out and described described the first frequency-region signal carried out to the instruction of Fast Fourier Transform Inverse process:
Described the first frequency-region signal after decoding demodulation and coded modulation is carried out to Fast Fourier Transform Inverse.
Further, after the component software of described processor 520 references to storage 530, carry out the instruction of following process:
Obtain described transmitting terminal described source signal carried out the coded format of coded modulation processing and described transmitting terminal described source signal is carried out the amplitude gate limit value of amplitude limiting processing from described transmitting terminal;
Further, after the component software of described processor 520 references to storage 530, carry out the demodulation of decoding of described the first frequency-region signal, obtain the instruction of decoded signal process:
The described coded format that utilization is obtained, to the demodulation of decoding of described the first frequency-region signal, obtains decoded signal;
Further, after the component software of described processor 520 references to storage 530, carry out described decoded signal carried out to coded modulation, obtain the instruction of the first frequency-region signal process after decoding demodulation and coded modulation:
The described coded format that utilization is obtained is carried out coded modulation to described decoded signal, obtains the first frequency-region signal after decoding demodulation and coded modulation.
Further, after the component software of described processor 520 references to storage 530, carry out described time-domain signal carried out to the concrete instruction of amplitude limiting processing process:
The described amplitude gate limit value that utilization is obtained, carries out amplitude limiting processing to described time-domain signal.
Further, after the component software of described processor 520 references to storage 530, carry out described the second frequency-region signal and described the first frequency-region signal compared, obtain the instruction of frequency domain compensation coefficient value process:
Described the second frequency-region signal and described the first frequency-region signal are subtracted each other or process of convolution, obtain frequency domain compensation coefficient value.
Further, after the component software of described processor 520 references to storage 530, carry out and utilize described frequency domain compensation coefficient value described the first frequency-region signal to be compensated to the instruction of process:
By the compensation that superposes of described the first frequency-region signal and described frequency domain compensation coefficient value;
Further, after the component software of described processor 520 references to storage 530, carry out the instruction of following process:
Described the first frequency-region signal after compensating is decoded after demodulation and exported.
Therefore, the device of the signal processing providing by the application embodiment of the present invention, receiving terminal carries out after FFT conversion amplitude limit initialize signal, carry out IFFT conversion and amplitude limiting processing, obtain frequency domain compensation coefficient value, the frequency domain compensation coefficient value obtaining and the amplitude limit initialize signal after FFT conversion are superposeed, and then realize the effect that receiving terminal compensates amplitude limit initialize signal, improve communication efficiency, reduce the error rate.
Professional should further recognize, unit and the algorithm steps of each example of describing in conjunction with embodiment disclosed herein, can realize with electronic hardware, computer software or the combination of the two, for the interchangeability of hardware and software is clearly described, composition and the step of each example described according to function in the above description in general manner.These functions are carried out with hardware or software mode actually, depend on application-specific and the design constraint of technical scheme.Professional and technical personnel can realize described function with distinct methods to each specifically should being used for, but this realization should not thought and exceeds scope of the present invention.
The software module that the method for describing in conjunction with embodiment disclosed herein or the step of algorithm can use hardware, processor to carry out, or the combination of the two is implemented.Software module can be placed in the storage medium of any other form known in random asccess memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technical field.
Above-described embodiment; object of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the foregoing is only the specific embodiment of the present invention; the protection range being not intended to limit the present invention; within the spirit and principles in the present invention all, any amendment of making, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. a method for signal processing, is characterized in that, described method comprises:
Receiving end/sending end carries out the amplitude limit initialize signal sending after amplitude limiting processing to source signal;
Described amplitude limit initialize signal is carried out to fast Fourier transform, obtain first frequency-region signal corresponding with described amplitude limit initialize signal;
Described the first frequency-region signal is carried out to Fast Fourier Transform Inverse, obtain the time-domain signal corresponding with described the first frequency-region signal;
Described time-domain signal is carried out to amplitude limiting processing, and the described time-domain signal after amplitude limit is carried out to fast Fourier transform again, obtain second frequency-region signal corresponding with described time-domain signal after amplitude limit;
Described the second frequency-region signal and described the first frequency-region signal are compared, obtain frequency domain compensation coefficient value;
Utilize described frequency domain compensation coefficient value to compensate described the first frequency-region signal.
2. method according to claim 1, is characterized in that, described described amplitude limit initialize signal is carried out after fast Fourier transform, before described the first frequency-region signal is carried out to Fast Fourier Transform Inverse, also comprises:
To the demodulation of decoding of described the first frequency-region signal, obtain decoded signal;
Described decoded signal is carried out to coded modulation, obtain the first frequency-region signal after decoding demodulation and coded modulation, described the first frequency-region signal is specially the frequency-region signal through decoding demodulation and coded modulation process;
Describedly described the first frequency-region signal carried out to Fast Fourier Transform Inverse comprise:
Described the first frequency-region signal after decoding demodulation and coded modulation is carried out to Fast Fourier Transform Inverse.
3. method according to claim 2, is characterized in that, before the amplitude limit initialize signal that described reception is undertaken sending after amplitude limiting processing by transmitting terminal, also comprises:
Obtain described transmitting terminal described source signal carried out the coded format of coded modulation processing and described transmitting terminal described source signal is carried out the amplitude gate limit value of amplitude limiting processing from described transmitting terminal;
Described to the demodulation of decoding of described the first frequency-region signal, obtain decoded signal and comprise:
The described coded format that utilization is obtained, to the demodulation of decoding of described the first frequency-region signal, obtains decoded signal;
Described described decoded signal is carried out to coded modulation, the first frequency-region signal obtaining after decoding demodulation and coded modulation comprises:
The described coded format that utilization is obtained is carried out coded modulation to described decoded signal, obtains the first frequency-region signal after decoding demodulation and coded modulation;
Describedly described time-domain signal carried out to amplitude limiting processing comprise:
The described amplitude gate limit value that utilization is obtained, carries out amplitude limiting processing to described time-domain signal.
4. method according to claim 1, is characterized in that, described described the second frequency-region signal and described the first frequency-region signal is compared, and obtains frequency domain compensation coefficient value and comprises:
Described the second frequency-region signal and described the first frequency-region signal are subtracted each other or process of convolution, obtain described frequency domain compensation coefficient value.
5. method according to claim 1, is characterized in that, describedly utilizes described frequency domain compensation coefficient value that described the first frequency-region signal is compensated and comprised:
By the compensation that superposes of described the first frequency-region signal and described frequency domain compensation coefficient value;
Described method also comprises: described the first frequency-region signal after compensating is decoded after demodulation and exported.
6. a device for signal processing, is characterized in that, described device comprises:
Receiving element, carries out the amplitude limit initialize signal sending after amplitude limiting processing to source signal for receiving end/sending end;
Fast Fourier transform unit, for described amplitude limit initialize signal is carried out to fast Fourier transform, obtains first frequency-region signal corresponding with described amplitude limit initialize signal;
Fast Fourier Transform Inverse unit, for described the first frequency-region signal is carried out to Fast Fourier Transform Inverse, obtains the time-domain signal corresponding with described the first frequency-region signal;
Amplitude limit unit, for carrying out amplitude limiting processing to described time-domain signal;
Described fast Fourier transform unit also for, the described time-domain signal after amplitude limit is carried out to fast Fourier transform again, obtain second frequency-region signal corresponding with described time-domain signal after amplitude limit;
Comparing unit, for described the second frequency-region signal and described the first frequency-region signal are compared, obtains frequency domain compensation coefficient value;
Compensating unit, for utilizing described frequency domain compensation coefficient value to compensate described the first frequency-region signal.
7. device according to claim 6, is characterized in that, described device also comprises:
Decoding demodulating unit, for demodulation that described the first frequency-region signal is decoded, obtains decoded signal;
Coded modulation unit, for described decoded signal is carried out to coded modulation, obtains the first frequency-region signal after decoding demodulation and coded modulation, and described the first frequency-region signal is specially the frequency-region signal through decoding demodulation and coded modulation process;
Described Fast Fourier Transform Inverse unit also for, described the first frequency-region signal after decoding demodulation and coded modulation is carried out to Fast Fourier Transform Inverse.
8. device according to claim 7, is characterized in that, described device also comprises:
Acquiring unit, carries out the coded format of coded modulation processing and described transmitting terminal described source signal is carried out the amplitude gate limit value of amplitude limiting processing to described source signal for obtain described transmitting terminal from described transmitting terminal;
Described decoding demodulating unit also for, utilize the described coded format obtained to the demodulation of decoding of described the first frequency-region signal, obtain decoded signal;
Described coded modulation unit also for, utilize the described coded format obtained to carry out coded modulation to described decoded signal, obtain the first frequency-region signal after decoding demodulation and coded modulation;
Described amplitude limit unit also for, utilize the described amplitude gate limit value that obtains, described time-domain signal is carried out to amplitude limiting processing.
9. device according to claim 6, is characterized in that, described comparing unit also for, described the second frequency-region signal and described the first frequency-region signal are subtracted each other or process of convolution, obtain described frequency domain compensation coefficient value.
10. device according to claim 7, is characterized in that, described compensating unit also for, by the compensation that superposes of described the first frequency-region signal and described frequency domain compensation coefficient value;
Described decoding demodulating unit also for, described the first frequency-region signal after compensating is decoded after demodulation and is exported.
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| CN101083646B (en) * | 2006-06-01 | 2010-04-14 | 电子科技大学 | Channel estimation optimizing method for amplitude-limiting OFDM system |
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| US7505522B1 (en) * | 2003-10-06 | 2009-03-17 | Staccato Communications, Inc. | Spectral shaping in multiband OFDM transmitter with clipping |
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