CN104125185B - The method and apparatus of signal transacting - Google Patents
The method and apparatus of signal transacting Download PDFInfo
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- CN104125185B CN104125185B CN201310155448.6A CN201310155448A CN104125185B CN 104125185 B CN104125185 B CN 104125185B CN 201310155448 A CN201310155448 A CN 201310155448A CN 104125185 B CN104125185 B CN 104125185B
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Abstract
The present embodiments relate to a kind of method and apparatus of signal transacting.Methods described includes：The amplitude limit initial signal that receiving end/sending end to source signal send after amplitude limiting processing；Fast Fourier Transform (FFT) is carried out to the amplitude limit initial signal, the first frequency-region signal corresponding with the amplitude limit initial signal is obtained；Fast Fourier Transform Inverse is carried out to first frequency-region signal, time-domain signal corresponding with first frequency-region signal is obtained；Amplitude limiting processing is carried out to the time-domain signal, and Fast Fourier Transform (FFT) is carried out again to the time-domain signal after amplitude limit, the second frequency-region signal corresponding with the time-domain signal after amplitude limit is obtained；Second frequency-region signal is compared with first frequency-region signal, frequency domain compensation coefficient value is obtained；First frequency-region signal is compensated using the frequency domain compensation coefficient value.
Description
Technical field
The present invention relates to communication field, more particularly to a kind of method and apparatus of signal transacting.
Background technology
OFDM (Orthogonal Frequency Division Multiplexing, referred to as：OFDM) skill
Art is a kind of multi-carrier modulation technology, the characteristic with availability of frequency spectrum height, anti-multipath fading and frequency selective fading, extensively
Applied in various types of wireless communication systems.
In time domain, because OFDM symbol is to be added to obtain by multiple independent sub-carrier signals through ovennodulation so that
Composite signal may produce the larger peak power of relative signal average value, thus bring larger papr
(Peak to Average Power Ratio, abbreviation peak-to-average force ratio PAPR), i.e.,：
Wherein mean { } represents the average value of signal；xnFor each sub-carrier signal in OFDM.
Because PAPR values are too high in existing ofdm system, to power amplifier, analog/digital conversion, D/A switch device
Dynamic range proposes higher requirement, otherwise, and the non-linear of device causes non-linear distortion, and the harmonic wave of generation causes interchannel
Interference, the bit error rate of system increases, and influences systematic function.
Currently, in the prior art, transmitting terminal is by carrying out amplitude limit to source signal, and then reduces PAPR values, due to sending
End is after to source signal amplitude limit, and source signal can lose the crest being cut in certain crest, these time domains in time domain and be mapped to
On frequency domain, source signal can be changed in each subcarrier data amplitude and phase of ofdm signal, entered on the receive side
When row demodulation process, increase error code.Therefore, transmitting terminal is each in record time domain while amplitude limit is carried out to source signal
The value whether crest of sampled point loses and lose, the first signal as shown in Fig. 1 (a), and regenerate same with source signal
The signal of sample length, the secondary signal as shown in Fig. 1 (b) sends the first signal and secondary signal to receiving terminal, receiving terminal will
First signal and secondary signal are merged in time domain, restore the original source signal of transmitting terminal, receiving terminal again to reduction after
Source signal carry out Fast Fourier Transform (FFT), demodulation, decoding etc., as shown in Figure 2.
The scheme of prior art reduces influence of the amplitude limit to source signal to the full extent, but this can make source signal be divided to two
Secondary transmission is to receiving terminal, and source signal is transmitted in two times, adds contributive rate of the interchannel noise to source signal, and particularly peak value is believed
Number so that bit error rate increase, the subsequent treatment to receiving terminal brings very big influence.
The content of the invention
The embodiments of the invention provide a kind of method and apparatus of signal transacting, to realize in receiving terminal to receiving
Signal is compensated, and improves communication efficiency, reduces the bit error rate.
In a first aspect, the embodiments of the invention provide a kind of method of signal transacting, methods described includes：
The amplitude limit initial signal that receiving end/sending end to source signal send after amplitude limiting processing；
Fast Fourier Transform (FFT) is carried out to the amplitude limit initial signal, obtained and the amplitude limit initial signal corresponding first
Frequency-region signal；
Fast Fourier Transform Inverse is carried out to first frequency-region signal, when obtaining corresponding with first frequency-region signal
Domain signal；
Amplitude limiting processing is carried out to the time-domain signal, and fast Fourier is carried out again to the time-domain signal after amplitude limit
Conversion, obtains the second frequency-region signal corresponding with the time-domain signal after amplitude limit；
Second frequency-region signal is compared with first frequency-region signal, frequency domain compensation coefficient value is obtained；
First frequency-region signal is compensated using the frequency domain compensation coefficient value.
It is described that the amplitude limit initial signal is carried out after Fast Fourier Transform (FFT) in the first possible implementation,
First frequency-region signal is carried out before Fast Fourier Transform Inverse, also included：
Decoding demodulation is carried out to first frequency-region signal, decoded signal is obtained；
The decoded signal is subjected to coded modulation, the first frequency domain letter after decoded demodulation and coded modulation is obtained
Number, first frequency-region signal is specially the frequency-region signal by decoding demodulation and coded modulation process；
It is described that first frequency-region signal progress Fast Fourier Transform Inverse is included：
Fast Fourier Transform Inverse is carried out to the first frequency-region signal after the decoded demodulation and coded modulation.
With reference to the first possible implementation of first aspect or first aspect, in second of possible implementation
In, described receive is carried out before the amplitude limit initial signal that sends also including after amplitude limiting processing by transmitting terminal：
Obtained at the transmitting terminal transmitting terminal source signal is carried out the coded format of coded modulation processing with
And the transmitting terminal carries out the amplitude limit threshold value of amplitude limiting processing to the source signal；
Described to carry out decoding demodulation to first frequency-region signal, obtaining decoded signal includes：
Decoding demodulation is carried out to first frequency-region signal using the coded format of acquisition, decoded signal is obtained；
It is described that the decoded signal is subjected to coded modulation, obtain the first frequency domain after decoded demodulation and coded modulation
Signal includes：
Coded modulation is carried out to the decoded signal using the coded format of acquisition, decoded demodulation and volume is obtained
The first frequency-region signal after code modulation；
It is described that time-domain signal progress amplitude limiting processing is included：
Using the amplitude limit threshold value of acquisition, amplitude limiting processing is carried out to the time-domain signal.
It is described to carry out second frequency-region signal and first frequency-region signal in the third possible implementation
Compare, obtaining frequency domain compensation coefficient value includes：
Second frequency-region signal and first frequency-region signal are subtracted each other or process of convolution, frequency domain is obtained and mends
Repay coefficient value.
It is described to utilize the frequency domain compensation coefficient value to first frequency-region signal in the 4th kind of possible implementation
Compensate including：
First frequency-region signal and the frequency domain compensation coefficient value are overlapped compensation；
Methods described also includes：First frequency-region signal after compensating exported after decoding demodulation.
In second aspect, the embodiments of the invention provide a kind of device of signal transacting, described device includes：
Receiving unit, the amplitude limit initial signal for source signal send after amplitude limiting processing for receiving end/sending end；
Fast Fourier Transform (FFT) unit, for carrying out Fast Fourier Transform (FFT) to the amplitude limit initial signal, is obtained and institute
State corresponding first frequency-region signal of amplitude limit initial signal；
Fast Fourier Transform Inverse unit, for carrying out Fast Fourier Transform Inverse to first frequency-region signal, is obtained
Time-domain signal corresponding with first frequency-region signal；
Clipping unit, for carrying out amplitude limiting processing to the time-domain signal；
The Fast Fourier Transform (FFT) unit is additionally operable to, and fast Fourier is carried out again to the time-domain signal after amplitude limit
Conversion, obtains the second frequency-region signal corresponding with the time-domain signal after amplitude limit；
Comparing unit, for second frequency-region signal to be compared with first frequency-region signal, obtains frequency domain and mends
Repay coefficient value；
Compensating unit, for being compensated using the frequency domain compensation coefficient value to first frequency-region signal.
In the first possible implementation, described device also includes：Demodulating unit is decoded, for the described first frequency
Domain signal carries out decoding demodulation, obtains decoded signal；
Coded modulation unit, for the decoded signal to be carried out into coded modulation, obtains decoded demodulation and coding is adjusted
The first frequency-region signal after system, first frequency-region signal is specially the frequency domain letter by decoding demodulation and coded modulation process
Number；
The Fast Fourier Transform Inverse unit is additionally operable to, to the first frequency after the decoded demodulation and coded modulation
Domain signal carries out Fast Fourier Transform Inverse.
With reference to the first possible implementation of second aspect or second aspect, in second of possible implementation,
Described device also includes：
Acquiring unit, for obtaining the transmitting terminal at the transmitting terminal to source signal progress coded modulation processing
Coded format and the transmitting terminal to the source signal carry out amplitude limiting processing amplitude limit threshold value；
The decoding demodulating unit is additionally operable to, and first frequency-region signal is solved using the coded format of acquisition
Code demodulation, obtains decoded signal；
The coded modulation unit is additionally operable to, using the coded format of acquisition to being carried out through the decoding demodulating unit
The decoded signal after decoding demodulation carries out coded modulation, obtains the first frequency domain letter after decoded demodulation and coded modulation
Number；
The clipping unit is additionally operable to, and using the amplitude limit threshold value of acquisition, the time-domain signal is carried out at amplitude limit
Reason.
In the third possible implementation, the comparing unit is additionally operable to, by second frequency-region signal with it is described
First frequency-region signal is subtracted each other or process of convolution, obtains frequency domain compensation coefficient value.
With reference to the first possible implementation of second aspect or second aspect, in the 4th kind of possible implementation,
The compensating unit is additionally operable to, and first frequency-region signal and the frequency domain compensation coefficient value are overlapped into compensation；
The decoding demodulating unit is additionally operable to, and first frequency-region signal after compensating carries out defeated after decoding demodulation
Go out.
Therefore, by the method and apparatus of application signal transacting provided in an embodiment of the present invention, receiving terminal is initial to amplitude limit
Signal is carried out after FFT, carries out IFFT conversion and amplitude limiting processing, obtains frequency domain compensation coefficient value, and the frequency domain of acquisition is mended
Repay coefficient value to be overlapped with the amplitude limit initial signal after FFT, and then realize that receiving terminal enters to amplitude limit initial signal
The effect of row compensation, improves communication efficiency, reduces the bit error rate.
Brief description of the drawings
Fig. 1 (a) is the first signal schematic representation in the prior art；
Fig. 1 (b) is secondary signal schematic diagram in the prior art；
Fig. 2 is the reduction source signal schematic diagram of receiving terminal in the prior art；
Fig. 3 is the method flow diagram of signal transacting provided in an embodiment of the present invention；
Fig. 4 is the schematic device of signal transacting provided in an embodiment of the present invention；
Fig. 5 is the device hardware schematic of signal transacting provided in an embodiment of the present invention.
Embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with the accompanying drawings to present invention specific implementation
Example is described in further detail.
In embodiments of the present invention, transmitting terminal carries out transmitting after amplitude limit to source signal, due in the higher situation of signal to noise ratio
Under, the amplitude limit initial signal after amplitude limit is smaller by channel influence of noise, can largely recover original source signal shape
State.Reappeared according to signal probability of occurrence, receiving terminal is to the amplitude limit initial signal after reception through Fast Fourier Transform (FFT) (Fast
Fourier Transformation, referred to as：FFT), Fast Fourier Transform Inverse (Inverse Fast Fourier
Transformation, referred to as：IFFT), new time-domain signal is formed, the sample point being so limited in transmitting terminal has larger
New peak value occurs in probability.Therefore, according to this characteristic, receiving terminal carries out clipping operation to time-domain signal again and passed through
After FFT, frequency domain compensation coefficient value is obtained.The frequency domain compensation coefficient value and amplitude limit initial signal are overlapped, realization pair
Amplitude limit initial signal is compensated.Due to being compensated in receiving terminal to amplitude limit initial signal, and then improve the reception of receiving terminal
Performance.
Illustrate the method for signal transacting provided in an embodiment of the present invention by taking Fig. 3 as an example below, Fig. 3 carries for the embodiment of the present invention
The method flow diagram of the signal transacting of confession, subject of implementation is receiving terminal in embodiments of the present invention.As shown in figure 3, the embodiment
Comprise the following steps：
The amplitude limit initial signal that step 310, receiving end/sending end to source signal send after amplitude limiting processing.
Specifically, transmitting terminal carries out amplitude limiting processing to source signal, obtains amplitude limit initial signal, transmitting terminal is sent to receiving terminal
The amplitude limit initial signal, receiving terminal receives the amplitude limit initial signal by being sent after transmitting terminal progress amplitude limiting processing.
If time-domain signal of the transmitting terminal after amplitude limit is：C′i=Ci+Di；
Then, the amplitude limit initial signal received by receiving terminal is：Y′i=Hi*C′i+Ni, wherein, i=0,1 ..., N-
1。
Wherein, CiFor the initial sending signal of transmitting terminal, DiFor lost signal after transmitting terminal amplitude limiting processing, HiFor letter
Road shock response, NiFor the noise signal in channel.
Step 320, to the amplitude limit initial signal carry out Fast Fourier Transform (FFT) after, obtain and the amplitude limit initial signal
Corresponding first frequency-region signal.
Specifically, receiving terminal is to amplitude limit initial signal Y 'iFFT is carried out, is obtained and amplitude limit initial signal Y 'iIt is corresponding
First frequency-region signal Y "i.The FFT is prior art, is no longer repeated herein.
Step 330, to first frequency-region signal carry out Fast Fourier Transform Inverse after, obtain and first frequency domain believe
Number corresponding time-domain signal.
Specifically, receiving terminal is to the first frequency-region signal Y "iCarry out after IFFT conversion, obtain and the first frequency-region signal Y "iCorrespondence
Time-domain signal Fi.The IFFT is transformed to prior art, no longer repeats herein.
Step 340, amplitude limiting processing is carried out to the time-domain signal, and the time-domain signal after amplitude limit carried out soon again
After fast Fourier transformation, the second frequency-region signal corresponding with the time-domain signal after amplitude limit is obtained.
Specifically, receiving terminal is to time-domain signal FiAmplitude limiting processing is carried out, and to the time-domain signal F after amplitude limitiCarry out again fast
After fast Fourier transformation, obtain and time-domain signal FiCorresponding second frequency-region signal Gi。
Further, the amplitude limiting processing is specially that certain characteristic (such as voltage, electric current, power) of input signal is super
All instantaneous values for crossing predetermined threshold weaken to close to this threshold value, and the behaviour that the instantaneous value all to other is retained
Make.
Step 350, second frequency-region signal is compared with first frequency-region signal, obtains frequency domain compensation coefficient
Value.
Specifically, receiving terminal is obtaining the second frequency-region signal GiAfterwards, by the second frequency-region signal GiWith the first frequency-region signal Y "i
It is compared, obtains frequency domain compensation coefficient
Further, second frequency-region signal is compared with first frequency-region signal, obtains frequency domain compensation system
Numerical value is specifically included：By the second frequency-region signal GiWith the first frequency-region signal Y "iSubtracted each other or process of convolution, obtain frequency domain and mend
Repay coefficient value
In one example, by the second frequency-region signal GiWith the first frequency-region signal Y "iSubtract each other, obtain frequency domain compensation coefficient value Wherein, i=0,1 ..., N-1.
Step 360, using the frequency domain compensation coefficient value first frequency-region signal is compensated.
Specifically, receiving terminal is obtaining frequency domain compensation coefficient valueAfterwards, frequency domain compensation coefficient value is utilizedTo the first frequency domain
Signal Y "iCompensate.
Further, receiving terminal utilizes frequency domain compensation coefficient valueTo the first frequency-region signal Y "iCompensate and specifically include：
Receiving terminal is by the first frequency-region signal Y "iWith frequency domain compensation coefficient valueCompensation is overlapped, the first frequency domain letter after being compensated
Number Wherein, i=0,1 ..., N-1,.
It is understood that the first frequency-region signal after the compensation that receiving terminal is obtainedAs receiving terminal is according to receiving
Amplitude limit initial signal Y 'iThe source signal restored.
Alternatively, also include before embodiment of the present invention step 330, receiving terminal is to the first frequency-region signal Y "iSolved
Code demodulation and coded modulation, by the first frequency-region signal Y "iCarrying out decoding demodulation and coded modulation can emulated
During the bit error rates of data is identified.
Receiving terminal carries out decoding demodulation to first frequency-region signal, obtains decoded signal.
Specifically, receiving terminal is to the first frequency-region signal Y "iDecoding demodulation is carried out, decoded signal B is obtainedi。
Further, receiving terminal obtains decoded signal BiAfterwards, by decoded signal BiIt is put into buffer, in order to follow-up step
Suddenly to decoded signal BiWhen being handled, decoded signal B is obtained from bufferi。
The decoded signal is carried out coded modulation by receiving terminal, obtains the first frequency after decoded demodulation and coded modulation
Domain signal.
Specifically, receiving terminal is by decoded signal BiCoded modulation is carried out, coded modulation processing is with transmitting terminal to source signal
The coded format for carrying out coded modulation processing is identical, obtains the first frequency-region signal Y " after decoded demodulation and coding carving system
′i。
Further, receiving terminal obtains decoded signal B from bufferi, to decoded signal BiCoded modulation is carried out, is obtained
The first frequency-region signal Y " ' after decoded demodulation and coded modulationi。
It should be noted that receiving terminal is to the first frequency-region signal Y "iCarry out after decoding demodulation, by decoded signal BiIt can be put into
In buffer, buffer can be by decoded signal BiExported after being replicated, the decoded signal B after duplicationiStorage is in both the buffers.
Receiving terminal is by the decoded signal B after duplicationiCoded modulation is carried out, the first frequency domain after decoded demodulation and coded modulation is obtained
Signal Y " 'i。
In embodiments of the present invention, the first frequency-region signal Y " 'iSpecially by decoding demodulation and coded modulation process
Frequency-region signal.
Alternatively, after the step of performing above-mentioned decoding demodulation and coded modulation, step 330 pair the first frequency domain letter
Number carry out Fast Fourier Transform Inverse be specially then：The first frequency-region signal after the decoded demodulation and coded modulation is entered
Row Fast Fourier Transform Inverse.
Specifically, receiving terminal is to the first frequency-region signal Y " ' after decoded demodulation and coded modulationiCarry out in quick Fu
Leaf inverse transformation.
Alternatively, before embodiment of the present invention step 310, transmitting terminal also is obtained to source at transmitting terminal including receiving terminal
Signal carries out the coded format of coded modulation processing, and to the amplitude limit threshold value of source signal progress amplitude limiting processing, receiving terminal leads to
Acquisition above- mentioned information is crossed, and then is handled accordingly in foregoing decoding demodulation, coded modulation and step 340.
Obtained at the transmitting terminal transmitting terminal source signal is carried out the coded format of coded modulation processing with
And the transmitting terminal carries out the amplitude limit threshold value of amplitude limiting processing to the source signal.
Specifically, receiving terminal obtained at transmitting terminal transmitting terminal to source signal carry out coded modulation processing coded format with
And transmitting terminal carries out the amplitude limit threshold value of amplitude limiting processing to source signal.
Further, in one implementation, receiving terminal passes through the active broadcast of transmitting terminal when adding communication network
Message obtains above- mentioned information.
Or, in another implementation, receiving terminal sends parameter request after communication network is added, to transmitting terminal and disappeared
Breath, acquisition above- mentioned information is replied message by the parameter of transmitting terminal.
Alternatively, foregoing receiving terminal carries out decoding demodulation to first frequency-region signal, and obtaining decoded signal includes：Receive
End is using the coded format obtained to the first frequency-region signal Y "iDecoding demodulation is carried out, decoded signal B is obtainedi。
Alternatively, the decoded signal is carried out coded modulation by foregoing receiving terminal, obtains treating that contrast signal includes：Receiving terminal
Using the coded format of acquisition to decoded signal BiCarry out coded modulation, obtain it is decoded demodulation and coded modulation after first
Frequency-region signal Y " 'i。
Alternatively, receiving terminal includes to time-domain signal progress amplitude limiting processing in step 340：Receiving terminal utilizes acquisition
Amplitude limit threshold value, to time-domain signal FiCarry out amplitude limiting processing.
Alternatively, after embodiment of the present invention step 360, methods described also includes：The institute after compensation will be overlapped
The first frequency-region signal is stated export after decoding demodulation.
Specifically, the first frequency-region signal that receiving terminal will be overlapped after compensationExported after decoding demodulation, in order to
Carry out follow-up processing.
Therefore, by the method for application signal transacting provided in an embodiment of the present invention, receiving terminal enters to amplitude limit initial signal
After row FFT, IFFT conversion and amplitude limiting processing are carried out, frequency domain compensation coefficient value is obtained, by the frequency domain compensation coefficient of acquisition
Value is overlapped with the amplitude limit initial signal after FFT, and then realizes that receiving terminal is compensated to amplitude limit initial signal
Effect, meanwhile, it also avoid produced problem in the prior art, improve communication efficiency, reduce the bit error rate.
Correspondingly, the embodiment of the present invention additionally provides a kind of device of signal transacting, to realize in previous embodiment
The method of signal transacting, as shown in figure 4, described device includes：It is receiving unit 410, Fast Fourier Transform (FFT) unit 420, quick
Fourier inversion unit 430, clipping unit 440, comparing unit 450 and compensating unit 460.
Receiving unit 410 in described device, the amplitude limit for source signal send after amplitude limiting processing for receiving end/sending end
Initial signal；
Fast Fourier Transform (FFT) unit 420, for the amplitude limit initial signal carry out Fast Fourier Transform (FFT), obtain with
Corresponding first frequency-region signal of the amplitude limit initial signal；
Fast Fourier Transform Inverse unit 430, for carrying out Fast Fourier Transform Inverse to first frequency-region signal, is obtained
To time-domain signal corresponding with first frequency-region signal；
Clipping unit 440, for carrying out amplitude limiting processing to the time-domain signal；
The Fast Fourier Transform (FFT) unit 420 is additionally operable to, and quick Fu is carried out again to the time-domain signal after amplitude limit
In leaf transformation, obtain the second frequency-region signal corresponding with the time-domain signal after amplitude limit；
Comparing unit 450, for second frequency-region signal to be compared with first frequency-region signal, obtains frequency domain
Compensation factor value；
Compensating unit 460, for being compensated using the frequency domain compensation coefficient value to first frequency-region signal.
Described device also includes：Demodulating unit 470 is decoded, for carrying out decoding demodulation to first frequency-region signal, is obtained
To decoded signal；
Coded modulation unit 480, for the decoded signal to be carried out into coded modulation, obtains decoded demodulation and coding
The first frequency-region signal after modulation, first frequency-region signal is specially the frequency domain by decoding demodulation and coded modulation process
Signal；
The Fast Fourier Transform Inverse unit 430 is additionally operable to, to the after the decoded demodulation and coded modulation
One frequency-region signal carries out Fast Fourier Transform Inverse.
Described device also includes：Acquiring unit 490, believes the source for obtaining the transmitting terminal at the transmitting terminal
Number carry out coded modulation processing coded format and the transmitting terminal to the source signal carry out amplitude limiting processing amplitude limit thresholding
Value；
The decoding demodulating unit 470 is additionally operable to, and first frequency-region signal is entered using the coded format of acquisition
Row decoding demodulation, obtains decoded signal；
The coded modulation unit 480 is additionally operable to, using the coded format of acquisition to through the decoding demodulating unit
Carry out the decoded signal after decoding demodulation and carry out coded modulation, obtain the first frequency after decoded demodulation and coded modulation
Domain signal；
The clipping unit 440 is additionally operable to, and using the amplitude limit threshold value of acquisition, amplitude limit is carried out to the time-domain signal
Processing.
The comparing unit 450 is additionally operable to, second frequency-region signal and first frequency-region signal are subtracted each other or
Person's process of convolution, obtains frequency domain compensation coefficient value.
The compensating unit 460 is additionally operable to, and first frequency-region signal is overlapped with the frequency domain compensation coefficient value
Compensation；
The decoding demodulating unit 470 is additionally operable to, and first frequency-region signal after compensating carries out decoding demodulation
After export.
Therefore, the device of signal transacting provided is implemented by the application present invention, receiving terminal is carried out to amplitude limit initial signal
After FFT, IFFT conversion and amplitude limiting processing are carried out, frequency domain compensation coefficient value is obtained, by the frequency domain compensation coefficient value of acquisition
It is overlapped with the amplitude limit initial signal after FFT, and then realizes what receiving terminal was compensated to amplitude limit initial signal
Effect, improves communication efficiency, reduces the bit error rate.
In addition, the device of signal transacting provided in an embodiment of the present invention can also be realized by following form, to realize this
The method of signal transacting in invention previous embodiment, as shown in figure 5, described device includes：Network interface 510, processor 520
With memory 530.
Network interface 510 is used to interact with the transmitting terminal in communication network to communicate.
Memory 530 can have software mould in permanent memory, such as hard disk drive and flash memory, memory 530
Block and device driver.Software module is able to carry out the various functions module of the above method of the present invention；Device driver can
To be network and interface drive program.
On startup, these component softwares are loaded into memory 530, are then accessed and are performed such as by processor 520
Give an order：
The amplitude limit initial signal that receiving end/sending end to source signal send after amplitude limiting processing；
Fast Fourier Transform (FFT) is carried out to the amplitude limit initial signal, obtained and the amplitude limit initial signal corresponding first
Frequency-region signal；
Fast Fourier Transform Inverse is carried out to first frequency-region signal, when obtaining corresponding with first frequency-region signal
Domain signal；
Amplitude limiting processing is carried out to the time-domain signal, and fast Fourier is carried out again to the time-domain signal after amplitude limit
Conversion, obtains the second frequency-region signal corresponding with the time-domain signal after amplitude limit；
Second frequency-region signal is compared with first frequency-region signal, frequency domain compensation coefficient value is obtained；
First frequency-region signal is compensated using the frequency domain compensation coefficient value.
Further, the processor 520 is accessed after the component software of memory 530, performs the instruction of procedure below：
Decoding demodulation is carried out to first frequency-region signal, decoded signal is obtained；
The decoded signal is subjected to coded modulation, the first frequency domain letter after decoded demodulation and coded modulation is obtained
Number, first frequency-region signal is specially the frequency-region signal by decoding demodulation and coded modulation process；
Further, the processor 520 is accessed after the component software of memory 530, is performed described to the described first frequency
Domain signal carries out the instruction of Fast Fourier Transform Inverse process：
Fast Fourier Transform Inverse is carried out to the first frequency-region signal after the decoded demodulation and coded modulation.
Further, the processor 520 is accessed after the component software of memory 530, performs the instruction of procedure below：
Obtained at the transmitting terminal transmitting terminal source signal is carried out the coded format of coded modulation processing with
And the transmitting terminal carries out the amplitude limit threshold value of amplitude limiting processing to the source signal；
Further, the processor 520 is accessed after the component software of memory 530, performs and first frequency domain is believed
Number carry out decoding demodulation, obtain the instruction of decoded signal process：
Decoding demodulation is carried out to first frequency-region signal using the coded format of acquisition, decoded signal is obtained；
Further, the processor 520 is accessed after the component software of memory 530, and the decoded signal is entered in execution
Row coded modulation, obtains the instruction of the first frequency-region signal process after decoded demodulation and coded modulation：
Coded modulation is carried out to the decoded signal using the coded format of acquisition, decoded demodulation and volume is obtained
The first frequency-region signal after code modulation.
Further, the processor 520 is accessed after the component software of memory 530, and execution is entered to the time-domain signal
The specific instruction of row amplitude limiting processing process：
Using the amplitude limit threshold value of acquisition, amplitude limiting processing is carried out to the time-domain signal.
Further, the processor 520 is accessed after the component software of memory 530, is performed and is believed second frequency domain
Number it is compared with first frequency-region signal, obtains the instruction of frequency domain compensation coefficient value process：
Second frequency-region signal and first frequency-region signal are subtracted each other or process of convolution, frequency domain is obtained and mends
Repay coefficient value.
Further, the processor 520 is accessed after the component software of memory 530, is performed and is utilized the frequency domain compensation
Coefficient value compensates the instruction of process to first frequency-region signal：
First frequency-region signal and the frequency domain compensation coefficient value are overlapped compensation；
Further, the processor 520 is accessed after the component software of memory 530, performs the instruction of procedure below：
First frequency-region signal after compensating exported after decoding demodulation.
Therefore, by the device of application signal transacting provided in an embodiment of the present invention, receiving terminal enters to amplitude limit initial signal
After row FFT, IFFT conversion and amplitude limiting processing are carried out, frequency domain compensation coefficient value is obtained, by the frequency domain compensation coefficient of acquisition
Value is overlapped with the amplitude limit initial signal after FFT, and then realizes that receiving terminal is compensated to amplitude limit initial signal
Effect, improve communication efficiency, reduce the bit error rate.
Professional should further appreciate that, each example described with reference to the embodiments described herein
Unit and algorithm steps, can be realized with electronic hardware, computer software or the combination of the two, hard in order to clearly demonstrate
The interchangeability of part and software, generally describes the composition and step of each example according to function in the above description.
These functions are performed with hardware or software mode actually, depending on the application-specific and design constraint of technical scheme.
Professional and technical personnel can realize described function to each specific application using distinct methods, but this realize
It is not considered that beyond the scope of this invention.
The method that is described with reference to the embodiments described herein can use hardware, computing device the step of algorithm
Software module, or the two combination are implemented.Software module can be placed in random access memory (RAM), internal memory, read-only storage
(ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technical field
In any other form of storage medium well known to interior.
Above-described embodiment, has been carried out further to the purpose of the present invention, technical scheme and beneficial effect
Describe in detail, should be understood that the embodiment that the foregoing is only the present invention, be not intended to limit the present invention
Protection domain, within the spirit and principles of the invention, any modifications, equivalent substitutions and improvements done etc. all should be included
Within protection scope of the present invention.
Claims (10)
1. a kind of method of signal transacting, it is characterised in that methods described includes：
The amplitude limit initial signal that receiving end/sending end to source signal send after amplitude limiting processing；
Fast Fourier Transform (FFT) is carried out to the amplitude limit initial signal, the first frequency domain corresponding with the amplitude limit initial signal is obtained
Signal；
Fast Fourier Transform Inverse is carried out to first frequency-region signal, time domain letter corresponding with first frequency-region signal is obtained
Number；
Amplitude limiting processing is carried out to the time-domain signal, and fast Fourier change is carried out again to the time-domain signal after amplitude limit
Change, obtain the second frequency-region signal corresponding with the time-domain signal after amplitude limit；
Second frequency-region signal is compared with first frequency-region signal, frequency domain compensation coefficient value is obtained；
First frequency-region signal is compensated using the frequency domain compensation coefficient value.
2. according to the method described in claim 1, it is characterised in that described that fast Fourier is carried out to the amplitude limit initial signal
After conversion, first frequency-region signal is carried out before Fast Fourier Transform Inverse, also included：
Decoding demodulation is carried out to first frequency-region signal, decoded signal is obtained；
The decoded signal is subjected to coded modulation, the first frequency-region signal after decoded demodulation and coded modulation, institute is obtained
It is specially the frequency-region signal by decoding demodulation and coded modulation process to state the first frequency-region signal；
It is described that first frequency-region signal progress Fast Fourier Transform Inverse is included：
Fast Fourier Transform Inverse is carried out to the first frequency-region signal after the decoded demodulation and coded modulation.
3. method according to claim 2, it is characterised in that the reception carries out what is sent after amplitude limiting processing by transmitting terminal
Also include before amplitude limit initial signal：
Coded format and institute that the transmitting terminal carries out coded modulation processing to the source signal are obtained at the transmitting terminal
State the amplitude limit threshold value that transmitting terminal carries out amplitude limiting processing to the source signal；
Described to carry out decoding demodulation to first frequency-region signal, obtaining decoded signal includes：
Decoding demodulation is carried out to first frequency-region signal using the coded format of acquisition, decoded signal is obtained；
It is described that the decoded signal is subjected to coded modulation, obtain the first frequency-region signal after decoded demodulation and coded modulation
Including：
Coded modulation is carried out to the decoded signal using the coded format of acquisition, decoded demodulation is obtained and coding is adjusted
The first frequency-region signal after system；
It is described that time-domain signal progress amplitude limiting processing is included：
Using the amplitude limit threshold value of acquisition, amplitude limiting processing is carried out to the time-domain signal.
4. according to the method described in claim 1, it is characterised in that described by second frequency-region signal and first frequency domain
Signal is compared, and obtaining frequency domain compensation coefficient value includes：
Second frequency-region signal and first frequency-region signal are subtracted each other or process of convolution, the frequency domain is obtained and mends
Repay coefficient value.
5. method according to claim 2, it is characterised in that described to utilize the frequency domain compensation coefficient value to described first
Frequency-region signal compensate including：
First frequency-region signal and the frequency domain compensation coefficient value are overlapped compensation；
Methods described also includes：First frequency-region signal after compensating exported after decoding demodulation.
6. a kind of device of signal transacting, it is characterised in that described device includes：
Receiving unit, the amplitude limit initial signal for source signal send after amplitude limiting processing for receiving end/sending end；
Fast Fourier Transform (FFT) unit, for carrying out Fast Fourier Transform (FFT) to the amplitude limit initial signal, is obtained and the limit
Corresponding first frequency-region signal of width initial signal；
Fast Fourier Transform Inverse unit, for carrying out Fast Fourier Transform Inverse to first frequency-region signal, is obtained and institute
State the corresponding time-domain signal of the first frequency-region signal；
Clipping unit, for carrying out amplitude limiting processing to the time-domain signal；
The Fast Fourier Transform (FFT) unit is additionally operable to, and fast Fourier change is carried out again to the time-domain signal after amplitude limit
Change, obtain the second frequency-region signal corresponding with the time-domain signal after amplitude limit；
Comparing unit, for second frequency-region signal to be compared with first frequency-region signal, obtains frequency domain compensation system
Numerical value；
Compensating unit, for being compensated using the frequency domain compensation coefficient value to first frequency-region signal.
7. device according to claim 6, it is characterised in that described device also includes：
Demodulating unit is decoded, for carrying out decoding demodulation to first frequency-region signal, decoded signal is obtained；
Coded modulation unit, for the decoded signal to be carried out into coded modulation, is obtained after decoded demodulation and coded modulation
The first frequency-region signal, first frequency-region signal be specially by decoding demodulation and coded modulation process frequency-region signal；
The Fast Fourier Transform Inverse unit is additionally operable to, and the first frequency domain after the decoded demodulation and coded modulation is believed
Number carry out Fast Fourier Transform Inverse.
8. device according to claim 7, it is characterised in that described device also includes：
Acquiring unit, for obtaining the volume that the transmitting terminal carries out coded modulation processing to the source signal at the transmitting terminal
Code form and the transmitting terminal carry out the amplitude limit threshold value of amplitude limiting processing to the source signal；
The decoding demodulating unit is additionally operable to, and decoding solution is carried out to first frequency-region signal using the coded format of acquisition
Adjust, obtain decoded signal；
The coded modulation unit is additionally operable to, and coded modulation is carried out to the decoded signal using the coded format of acquisition,
Obtain the first frequency-region signal after decoded demodulation and coded modulation；
The clipping unit is additionally operable to, and using the amplitude limit threshold value of acquisition, amplitude limiting processing is carried out to the time-domain signal.
9. device according to claim 6, it is characterised in that the comparing unit is additionally operable to, second frequency domain is believed
Number subtracted each other or process of convolution with first frequency-region signal, the acquisition frequency domain compensation coefficient value.
10. device according to claim 7, it is characterised in that the compensating unit is additionally operable to, first frequency domain is believed
Number with the frequency domain compensation coefficient value be overlapped compensation；
The decoding demodulating unit is additionally operable to, and first frequency-region signal after compensating exported after decoding demodulation.
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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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| 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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| CN1567762A (en) * | 2003-06-10 | 2005-01-19 | 北京邮电大学 | A channel estimation method adapted for OFDMA system |
| US7505522B1 (en) * | 2003-10-06 | 2009-03-17 | Staccato Communications, Inc. | Spectral shaping in multiband OFDM transmitter with clipping |
| 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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