CN102263574B - Narrowband interference detection and suppression method, device and receiver for communication system - Google Patents
Narrowband interference detection and suppression method, device and receiver for communication system Download PDFInfo
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- CN102263574B CN102263574B CN201110157754.4A CN201110157754A CN102263574B CN 102263574 B CN102263574 B CN 102263574B CN 201110157754 A CN201110157754 A CN 201110157754A CN 102263574 B CN102263574 B CN 102263574B
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Abstract
The invention provides an interference detection and suppression method for a broadband spread spectrum communication system. The method comprises the following steps of: 1, performing grouping caching processing on a received signal to obtain a received signal vector; 2, detecting whether the received signal vector has narrowband interference or not, turning to a step 3 if the received signal vector has the narrowband interference, and turning to a step 5 if the received signal vector does not have the narrowband interference; 3, computing an autocorrelative matrix P; 4, performing linear transformation on the received signal vector by adopting the autocorrelative matrix P to obtain a narrowband interference-suppressed received signal vector; 5, performing power normalization processing on the narrowband interference-suppressed received signal vector to obtain a power-regulated received signal vector; and 6, recovering the power-regulated received signal vector into a normal received chip signal. The invention also provides a narrowband interference detection and suppression device and a receiver. By the narrowband interference detection and suppression method, the narrowband interference detection and suppression device and the receiver provided by the invention, kinds of narrowband interference can be detected and suppressed effectively; and the method, the device and the receiver are low in complexity and high in robustness.
Description
Technical field
The invention belongs to wide-band spread spectrum field of wireless communications, in more particularly to a kind of wide-band spread spectrum communication system, arrowband is done
Disturb detection suppressing method, device and receiver.
Background technology
Wide-band spread spectrum communication system is one of digital communication system for being most widely used at this stage, with ability of anti-multipath
By force, various advantages such as low, low intercepting and capturing rate of transmission power.Arrowband interference (such as single tone jamming, narrow-band digital interference etc.) is current width
Present in band spread spectrum communication system, a kind of main interference, is illustrated in figure 1 wide-band spread spectrum communication system and narrowband systems frequency spectrum
Overlapping schematic diagram, from Fig. 1, the frequency spectrum presence of broadband signal and narrow band signal is overlapping, therefore system can be produced each other
Raw spectral interference.
Existing Narrow Band Interference Suppression Technique can be divided into following three class：
(1) time domain prediction technology：Regard the wideband spread-spectrum signal received in signal as time upper incoherent stochastic signal,
It is uncertain.And arrowband therein is disturbed due to having strong correlation on the time, thus it is predictable, thus designs
Sef-adapting filter, by the current input of the input prediction system of system last time, and system currently practical input value is worked as
The desired output of sef-adapting filter is done, the forecast error for obtaining is wideband spread-spectrum signal.Time domain prediction technology is based on narrow
With disturbing what predictable hypothesis was designed, when in arrowband, interference is digital signal, this hypothesis is often ungratified, institute
With poor-performing of the time domain prediction technology to digital Suppression of narrow band interference.And wideband spread-spectrum signal be not it is random, so
In order to reach preferable rejection, Predicting Technique must be introduced into nonlinear correction function, and this will increase overhead.
(2) transform domain suppression technology：In view of frequency domain, the power distribution of wideband spread-spectrum signal is in one section of wider frequency spectrum
On, and the power distribution of narrow band signal then Relatively centralized, thus signal conversion can will be received by DFT (discrete Fourier transform)
To frequency domain, the spectral line excessive to wherein amplitude is deleted or reduction is processed, then by IDFT (Inverse Discrete Fourier Transform) by its
Thus inverse transformation reaches the purpose of AF panel to time domain.The problem that conversion field technique is present is spectral leakage and useful signal
Lose.Spectral leakage can to a certain degree be suppressed by the method for adding window, but while adding window, cause useful signal again
Distortion.As transform domain method is that therefore useful signal can not suppressing interference by deleting and reducing the method for excessive spectral line
What is avoided incurs loss in process of inhibition, and in arrowband, interference is for single tone jamming or during linear FM signal, and this loss can be with
Ignore, but when arrowband interference is the relatively large AR stochastic processs of bandwidth or digital signal, it is useful that spectral line process is caused
The loss of signal can make a big impact to systematic function.
(3) code auxiliary interference mitigation technology：Arrowband interference can be regarded as the superposition of multiple wide-band spread spectrum subscriber signals, thus
Which is suppressed using the method for Multiuser Detection.Code-aided technique is entered using the multiuser detection as MMSE
Row Suppression of narrow band interference.Code-aided technique is divided into fixed Code-aided technique and adaptive code ancillary technique, and the former is applied to interference
Situation known to signal statistics, the latter are applied to the unknown situation of interference signal.Fixed Code-aided technique needs interference letter
Number prior information, in systems in practice inconvenience realize.And the performance of adaptive code ancillary technique is unsatisfactory, and to dimension
For the autocorrelation matrix of spreading factor, to process hour operation quantity excessive.Code-aided technique is required for receiving signal synchronously in addition
In the case of carry out, in the case of strong jamming is present, system usually cannot be smoothly synchronous.
It has been investigated that, deposit in case of interferers in wide-band spread spectrum communication system, can using Suppression of narrow band interference module
To be obviously improved systematic function, but, in the presence of the interference of no arrowband, AF panel module can there are following two and ask
Topic：(1) increase the complexity of system；(2) lifting to systematic function is not helped.The problems referred to above limit Suppression of narrow band interference
The practical application of technology, thus, it is necessary to study the scheme that a kind of arrowband Interference Detection suppresses, solves the reality of interference mitigation technology
Border application problem.
The content of the invention
It is an object of the invention to provide arrowband Interference Detection suppressing method in a kind of wide-band spread spectrum communication system, device and
Receiver, complexity is low, strong robustness effectively to detect and suppress plurality of narrow band to have while interference.
To solve above technical problem, the present invention provides Interference Detection suppressing method in a kind of wide-band spread spectrum communication system,
Including,
Step 1, the docking collection of letters number carry out grouping cache process, obtain received signal vector；
Step 2, detection received signal vector are disturbed with the presence or absence of arrowband, if existing, go to step 3；If not existing, go to
Step 5；
Step 3, calculates auto-correlation P matrix；
Step 4, does linear transformation to received signal vector using auto-correlation P matrix, obtains connecing after Suppression of narrow band interference
Receive signal vector；
Step 5, to the received signal vector power normalized after Suppression of narrow band interference, after obtaining power adjustment
Received signal vector；
Step 6, the reception vector signal after power is adjusted are reverted to and normally receive chip signal.
Further, the step 2 is specifically included：
Step 21, linear transformation obtain coefficient matrix；
Step 22, the coefficient matrix to obtaining carry out SVD decomposition, obtain singular value；
Step 23, takes and does contrast with threshold value after maximum and minima in singular value ask business and determine whether there is arrowband
Interference.
Further, the step 23 is specifically included：
Take maximum and minima in singular value and ask business, quotient and threshold value are compared, if quotient is less than door
Limit value, then judge not interfering with presence；If quotient exceedes threshold value, it is determined with interference and exists.
Further, in the step 3, auto-correlation P matrix is calculated in the following ways：
Take P=A-1Or P=(Aj+βI)-1, wherein, A represents that M dimensions receive the autocorrelation matrix of vector；AjRepresent M dimension interference
The autocorrelation matrix of vector；I represents M dimension unit matrixs；β >=0, typical value are 0 or σ2, σ2Represent white noise acoustical power；(·)-1
Representing matrix it is inverse.
To solve above technical problem, the present invention provides Interference Detection restraining device in a kind of wide-band spread spectrum communication system,
Including：Framing module, calculating matrix P module, AF panel control module, AF panel module, power normalization module, sampling
Recovery module,
The framing module, the frequency spectrum overlap signal to passing through carry out caching process, constitute a received signal vector, send
Enter the calculating matrix P module；
The calculating matrix P module, determines whether there is interference by Interference Detection, and according to testing result output control
Signal gives the AF panel control module, and the autocorrelation matrix P for being calculated received signal vector；
The AF panel control module, decides whether to open according to the control signal of calculating matrix P module output
AF panel module；
The AF panel module, to obtain received signal vector autocorrelation matrix P carries out interference process, disturbed
Signal after suppression；
The power normalization module, carries out power normalization process to the signal after AF panel, sends into sampling and recovers
Module；
Received signal vector after AF panel is processed is reverted to normal reception and is believed by the sampling recovery module
Number.
Further, the calculating P matrix modules include：Linear transform unit, singular value decomposition unit, identifying unit,
Matrix inversion unit,
The linear transform unit, carries out linear process to received signal vector；
The singular value decomposition unit, in inversion process, decomposites singular value；
The identifying unit, determines whether there is interference, output control signal according to the singular value decomposed；
The matrix inversion unit, carries out process of inverting to the matrix of singular value decomposition unit output.
To solve above technical problem, the present invention provides a kind of receiver, including Interference Detection restraining device, demodulation dress
Put,
Baseband receiving signals are carried out detection and judge whether interference by the Interference Detection restraining device, and to existing
Interference carries out linear change, obtains the baseband receiving signals after AF panel；
Baseband receiving signals after AF panel are de-spread by the demodulating equipment and inverse mapping is processed, and obtain bit
DBMS.
Further, the receiver further includes matched filter, for matching to baseband receiving signals
Filter process, obtains the reception signal after filter process, sends into the interference rejection unit.
Further, the receiver further includes scrambling generator and spectrum-spreading code generator,
The scrambling generator, for producing the pseudo-code needed for descrambling, the baseband receiving signals after AF panel are solved
Chip DBMS is obtained after disturbing process；
The spectrum-spreading code generator, for producing the chip needed for despreading, chip DBMS is processed through despreading and is accorded with
Number DBMS, sends into demodulating equipment.
Further, the receiver further includes sink device, for by receive demodulating equipment bit data with
The bit DBMS of transmitting is compared, and calculates the bit error rate.
Compared with prior art, arrowband Interference Detection suppressing method in wide-band spread spectrum communication system of the invention, device and
Receiver, solves Code-aided technique and causes using blind Detecting technology acuracy is limited in the case where signal statistics unknown situation is received
Interference suppressioning effect poor, can effectively detect and suppress plurality of narrow band to disturb, while having, complexity is low, robustness
By force；Reduce the Code-aided technique in the case of frequency selective fading channels and answering for detection vector is generated based on each expectation user
Miscellaneous degree；And using the spread spectrum scheme of long code, enable the invention to the TD-SCDMA, WCDMA being applied in 3G (Third Generation) Moblie
System etc..
Description of the drawings
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the present invention, this
Bright schematic description and description does not constitute inappropriate limitation of the present invention for explaining the present invention.In the accompanying drawings：
Fig. 1 is existing wide-band spread spectrum communication system and the overlapping schematic diagram of narrowband systems frequency spectrum；
Wide-band spread spectrum communication system band receiver of base structure charts of the Fig. 2 for the embodiment of the present invention；
Structure charts of the Fig. 3 for the Interference Detection restraining device of the embodiment of the present invention；
Structure charts of the Fig. 4 for the calculating matrix P module of the embodiment of the present invention；
Interference Detection suppressing method flow charts of the Fig. 5 for the embodiment of the present invention；
Fig. 6 is the embodiment of the present invention in the overlapping system schematics of GSM＆WCDMA；
Fig. 7 is performance comparison figure of the embodiment of the present invention in the overlapping systems of GSM＆WCDMA.
Specific embodiment
In order that the technical problem to be solved, technical scheme and beneficial effect are clearer, clear, below tie
Drawings and Examples are closed, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein is only used
To explain the present invention, it is not intended to limit the present invention.
As shown in Fig. 2 for the wide-band spread spectrum communication system band receiver of base structure chart of the embodiment of the present invention.The receiver bag
Include：Scrambling generator 1, spectrum-spreading code generator 2, matched filter 3, Interference Detection restraining device 4, demodulating equipment 5, stay of two nights dress
Put 6.Wherein：
Baseband receiving signals are done matched filter process, eliminate out-of-band interference and noise by the matched filter 3,
Obtain reception signal r (n) after filter process
R (n)=s (n)+j (n)+n (n) (formula 1)
Wherein, r (n) is reception signal；S (n) is desired wide-band spread spectrum subscriber signal；J (n) is disturbed for arrowband, for example
Single tone jamming, frequency modulation interference, digitized reading room etc.；N (n) is white Gaussian noise.
Baseband receiving signals after matched filter is processed are carried out detection and are sentenced by the Interference Detection restraining device 4
It is disconnected to whether there is interference, and linear change is carried out to there is interference, obtain the baseband receiving signals after AF panel；
The scrambling generator 1, for producing the pseudo-code needed for descrambling, the baseband receiving signals after AF panel are solved
Chip DBMS is obtained after disturbing process；
The spectrum-spreading code generator 2, for producing the chip needed for despreading, chip DBMS is processed through despreading and is accorded with
Number DBMS, sends into demodulating equipment 5；
The data of baseband chip level are de-spread by the demodulating equipment 5 and inverse mapping is processed, and obtain bit DBMS；
The sink device 6, the bit data for receiving demodulating equipment 5 is compared with the bit DBMS of transmitting, is counted
Calculate the bit error rate.
Fig. 3 is the detailed structure view that a kind of Interference Detection restraining device 4 is proposed according to the embodiment of the present invention, and the device is used for
In wide-band spread spectrum communication system, including：Framing module 41, calculating matrix P module 42, AF panel control module 43, interference suppression
Molding block 44, power normalization module 45, sampling recovery module 46；
The framing module 41, the frequency spectrum overlap signal to passing through carry out caching process, constitute a received signal vector,
Send into the calculating matrix P module 42.It is specific as follows：
Signal r (n) will be received the receiving matrix R that M dimension 2560/M are arranged will be combined as into for one group according to every M chip.
The calculating matrix P module 42, determines whether there is interference by Interference Detection, and is controlled according to testing result output
Signal processed is to AF panel control module 43, and the autocorrelation matrix P for being calculated received signal vector.Specially：If
There is interference, then the autocorrelation matrix P of received signal vector is obtained by matrix inversion, AF panel control module is opened in output
43 control signal, if there is no interference, the control signal of AF panel control module is closed in output.
As shown in figure 4, a kind of calculating matrix P module 42 provided in an embodiment of the present invention, the calculating matrix P module 42 is wrapped
Include：Linear transform unit 421, singular value decomposition (SVD, Singular Value Decomposition) unit 422, judgement are single
Unit 423, matrix inversion unit 424.
The linear transform unit 421, carries out linear process to received signal vector；
The singular value decomposition unit 422, in inversion process, decomposites singular value by SVD decomposition methods；
The identifying unit 423, determines whether there is interference, output control signal according to the singular value for decompositing；
The matrix inversion unit 424, carries out process of inverting to the matrix of the output of singular value decomposition unit 422.
The AF panel control module 43, decides whether according to the control signal of the calculating matrix P module 42 output
AF panel module 44 is opened, AF panel module 44 is opened when interference is present, when there is no interference, is not turned on AF panel
Module 44；
The AF panel module 44, obtains the autocorrelation matrix P of received signal vector, is sent to multiplier by inverting
The process that is multiplied is carried out with receiving matrix R, the signal R after AF panel is obtained%。
R%=PR (formula 2)
The power normalization module 45, carries out power normalization process to the signal after AF panel, sends into sampling extensive
Multiple module.It is specific as follows：Described power normalization module, carries out power normalization process to the signal after AF panel,
r%=r%/ (1- λ) (formula 3)
Received signal vector after AF panel is processed is reverted to normal reception by the sampling recovery module 46
Signal.It is specific as follows：By the received signal vector r after AF panel is processed%[k] reverts to normal reception chip signal
Wherein, Expression is rounded to scalar downwards, r% iRepresent vector r%I-th element.
Fig. 5 is arrowband Interference Detection suppression side in a kind of wide-band spread spectrum communication system that embodiments in accordance with the present invention are provided
The flow chart of method, comprises the following steps：
Step 1, the docking collection of letters number carry out grouping cache process, obtain received signal vector；
Step 2, detection received signal vector are disturbed with the presence or absence of arrowband, if there is interference, go to step 3；If not existing
Interference, goes to step 5；Specifically include：
Step 21, linear transformation obtain coefficient matrix.Method is as follows：
Linear transformation is done to receiving matrix R, coefficient matrices A is obtained, i.e.,：
AM,M=RM,2560/MQ2560/M,M(formula 5)
Wherein, Q2560/M,M=β RH M,2560/M, RH M,2560/MFor receiving matrix RM,2560/MTransposition, β is channel gain,
Step 22, the coefficient matrices A to obtaining carry out SVD decomposition, obtain singular value.Method is as follows：
SVD decomposition is done to coefficient matrices A, square formation U and V of M dimensions, and the singular value vector Λ=(a of M dimensions is obtained1...,
aM)。
Step 23, is taken after maximum and minima in singular value ask business and is contrasted with threshold value, determines whether to exist narrow
Band interference.Method is as follows：
Take maximum and minima in M element of singular value vector and ask business, quotient and threshold value Φ are compared, such as
Fruit quotient is less than threshold value Φ, then judge not interfering with presence, go to step 5；If quotient exceedes threshold value, it is determined with
Interference is present, and carries out AF panel, goes to step 3.
Step 3, calculates autocorrelation matrix P, takes P=A-1Or P=(Aj+βI)-1, wherein, A represents M dimension received signal vectors
Autocorrelation matrix；AjRepresent the autocorrelation matrix of M dimension interference vectors；I represents M dimension unit matrixs；β >=0, typical value are 0
Or σ2, σ2Represent white noise acoustical power；(·)-1Representing matrix it is inverse.In the present embodiment, with P=A-1As a example by illustrate and how to ask
Solution autocorrelation matrix P, method are as follows：
Square formation U and V are obtained by SVD, to singular value vector Λ=(a1..., aM) ask reciprocal, obtain M element of the inside constitutes diagonal matrix with diagonal matrix function, that is, obtainAccording to formula A-1
=V Σ-1UH, calculate A-1, you can obtain autocorrelation matrix P.
Step 4, does linear transformation to received signal vector using auto-correlation P matrix, obtains connecing after Suppression of narrow band interference
Receive signal vector；
Step 5, to the received signal vector power normalized after Suppression of narrow band interference, after obtaining power adjustment
Received signal vector；
Step 6, the reception vector signal after power is adjusted are reverted to and normally receive chip signal.
Fig. 6 is the overlapping system embodiments of one GSM＆WCDMA of the present invention；From in Fig. 5, GSM signals and UMTS signals
Frequency spectrum exist overlapping, therefore spectral interference can be produced each other, this will cause up-downgoing to receive signal to interfere with each other, cover
Shrink serious with capacity, more serious will cause system unavailable.The present invention can suppress interference not lose useful letter simultaneously
Number, solve the problems, such as that above-mentioned frequency spectrum is overlapped.
Fig. 7 is performance comparison figure of the present invention in the overlapping systems of GSM＆WCDMA, and Fig. 6 can be seen that of the invention in Gao Xingan
Than lower interference rejection capability substantially, and better than traditional frequency domain notch technology.Meanwhile, the present invention also has complexity low and does not receive
Scrambler confinement features, have more practicality in the WCDMA system of reality, on the premise of existing receiver structure is not affected,
Simple one AF panel module of increase, you can good inhibitory action is played in the interference to multiple GSM.
The technology of the present invention is not limited to only process the overlapping configuring condition of WCDMA and GSM frequency spectrums, can also process GSM＆CDMA
Configuring condition.
Described above illustrates and describes a preferred embodiment of the present invention, but as previously mentioned, it should be understood that the present invention
Be not limited to form disclosed herein, be not to be taken as the exclusion to other embodiment, and can be used for various other combinations,
Modification and environment, and can be in invention contemplated scope described herein, by above-mentioned teaching or the technology or knowledge of association area
It is modified.And change that those skilled in the art are carried out and change be without departing from the spirit and scope of the present invention, then all should be at this
In the protection domain of bright claims.
Claims (9)
1. Interference Detection suppressing method in a kind of wide-band spread spectrum communication system, it is characterised in that include,
Step 1, the docking collection of letters number carry out grouping cache process, obtain received signal vector；
Step 2, detection received signal vector are disturbed with the presence or absence of arrowband, if existing, go to step 3；If not existing, step is gone to
5；
Step 3, calculates auto-correlation P matrix；
Step 4, does linear transformation to received signal vector using auto-correlation P matrix, obtains the letter of the reception after Suppression of narrow band interference
It is number vectorial；
Step 5, to the received signal vector power normalized after Suppression of narrow band interference, obtains the reception after power adjustment
Signal vector；
Step 6, the reception vector signal after power is adjusted are reverted to and normally receive chip signal.
2. the method for claim 1, it is characterised in that the step 2 is specifically included：
Step 21, linear transformation obtain coefficient matrix；
Step 22, the coefficient matrix to obtaining carry out SVD decomposition, obtain singular value；
Step 23, is taken and is done
Disturb.
3. method as claimed in claim 2, it is characterised in that the step 23 is specifically included：
Take maximum and minima in singular value and ask business, quotient and threshold value are compared, if quotient is less than threshold value,
Then judge not interfering with presence；If quotient exceedes threshold value, it is determined with interference and exists.
4. the method for claim 1, it is characterised in that in the step 3, calculates auto-correlation P square in the following ways
Battle array：
Take P=A-1Or P=(Aj+βI)-1, wherein, A represents that M dimensions receive the autocorrelation matrix of vector；AjRepresent M dimension interference vectors
Autocorrelation matrix；I represents M dimension unit matrixs；β >=0, typical value are 0 or σ2, σ2Represent white noise acoustical power；(·)-1Represent
Inverse of a matrix.
5. Interference Detection restraining device in a kind of wide-band spread spectrum communication system, it is characterised in that include：Framing module, calculating square
Battle array P module, AF panel control module, AF panel module, power normalization module, sampling recovery module,
The framing module, the frequency spectrum overlap signal to passing through carry out caching process, constitute a received signal vector, send into institute
State calculating matrix P module；
The calculating matrix P module, determines whether there is interference by Interference Detection, and according to testing result output control signal
To the AF panel control module, and the autocorrelation matrix P for being calculated received signal vector；
The AF panel control module, decides whether to open interference according to the control signal of calculating matrix P module output
Suppression module；
The AF panel module, to obtain received signal vector autocorrelation matrix P carries out interference process, obtain AF panel
Signal afterwards；
The power normalization module, carries out power normalization process to the signal after AF panel, sends into sampling recovery module；
Received signal vector after AF panel is processed is reverted to normal reception signal by the sampling recovery module.
6. device as claimed in claim 5, it is characterised in that the calculating P matrix modules include：It is linear transform unit, strange
Different value resolving cell, identifying unit, matrix inversion unit,
The linear transform unit, carries out linear process to received signal vector；
The singular value decomposition unit, in inversion process, decomposites singular value；
The identifying unit, determines whether there is interference, output control signal according to the singular value decomposed；
The matrix inversion unit, carries out process of inverting to the matrix of singular value decomposition unit output.
7. a kind of receiver, it is characterised in that conciliate including Interference Detection restraining device, scrambling generator, spectrum-spreading code generator
Adjust device,
Baseband receiving signals are carried out detection and judge whether interference by the Interference Detection restraining device, and to there is interference
Linear change is carried out, the baseband receiving signals after AF panel are obtained；
The scrambling generator, for producing the pseudo-code needed for descrambling, the baseband receiving signals after the AF panel are solved
Chip DBMS is obtained after disturbing process；
The spectrum-spreading code generator, for producing the chip needed for despreading, the chip DBMS is processed through despreading and is accorded with
Number DBMS, sends into the demodulating equipment；
The demodulating equipment, is de-spread to the sign level data and inverse mapping is processed, and obtains bit DBMS.
8. receiver as claimed in claim 7, it is characterised in that further include matched filter, for the base
Band receives signal and carries out matched filter process, obtains the reception signal after filter process, sends into the Interference Detection and suppresses
Device.
9. receiver as claimed in claim 7, it is characterised in that further include sink device, for the solution will be received
The bit data and the bit DBMS of transmitting for adjusting device is compared, and calculates the bit error rate.
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| CN102710290B (en) * | 2012-06-13 | 2015-01-28 | 清华大学深圳研究生院 | Method for eliminating narrow-band interference in under-sampling rate pulse UWB (Ultra Wide Band) communication system |
| CN107727228B (en) * | 2017-07-11 | 2019-12-31 | 中国人民解放军空军工程大学 | Sound field modal analysis method based on resonance enhanced singular value decomposition |
| CN107345834B (en) * | 2017-07-11 | 2020-06-23 | 中国人民解放军空军工程大学 | Linear narrow-band filtering method based on resonance enhanced singular value decomposition |
| CN108880604B (en) * | 2018-06-28 | 2021-05-14 | 河南机电职业学院 | Multi-component frequency modulation interference suppression method and device in spread spectrum communication system |
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