CN105119631B - A kind of band spread receiver multi-address interference supression method based on frequency spectrum detection - Google Patents
A kind of band spread receiver multi-address interference supression method based on frequency spectrum detection Download PDFInfo
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Abstract
The invention provides a kind of band spread receiver multi-address interference supression method based on frequency spectrum detection, this method is on the basis of conventional part correlation FFT code acquisition algorithms, utilize the auto-correlation spectrum characteristic of spreading code, and the cross-correlation spectral characteristic between code of the same clan, the double check of useful signal and multi-access inference is carried out to the reception signal for being superimposed multi-access inference, multi-access inference can be suppressed in spread-spectrum signal pseudo-code and capturing carrier stage, application of this method in band spread receiver, solve the problems, such as the presence due to multi-access inference and caused by pseudo-code or carrier wave erroneous arrest.This method has the features such as realizing simply, anti-multi-access inference positive effect.
Description
Technical field
The present invention relates to measurement and control signal Anti-Jamming Technique field, more particularly to a kind of band spread receiver based on frequency spectrum detection
Multi-address interference supression method.
Background technology
At present, DSSS TT ＆ C architecture has in relaying measurement and control area and ground measurement and control area and widely should
With spacecraft observing and controlling, which has, receives the features such as level dynamic range is big, frequency Doppler dynamic range is big, with spacecraft demand
Continuous improvement, in-orbit spacecraft quantity also gradually increasing, and has during multi-access inference phenomenon between spacecraft observing and controlling product
It is existing, therefore, in order to ensure the security of spacecraft TTC channel, it is necessary to develop the spacecraft with certain anti-multi-access inference ability
Observing and controlling product.
Prior art is analyzed, has consulted Wanfang Database, Defence Technology Information Resources Service System, national science and technology
The related systems such as book document center, in the data of literatures hitherto found, on band spread receiver multi-access inference,
It is caused cross-correlation interference between different user in cdma communication to study more, and for this problem, many documents propose
Corresponding solution method, the multi-address interference supression method for being mainly based upon Multiuser Detection of use, including：《DS-
CDMA Multiuser Detections》(author：Liu Weihong), the paper universal model of conventional multi-user detection technique, due to most
Excellent multiuser detection algorithm complexity increases with number of users exponentially, and when number of users is larger, this method is infeasible,
Therefore, it is quasi-optimal detection algorithm to study at present in conventional multi-user detection technique more.On quasi-optimal detection algorithm
Document it is a lot, such as《The research and realization of spread spectrum radio communications system and its multiuser interference suppression method》(author：King
It is beautiful)；《Analysis of a simple successive interference cancellation scheme in a
DS—CDMA System》(author：P.Patel etal etc.)；《Very low rate convolution codes for
maximumtheoretical performance of spread spectrum multi-access channels.》(make
Person：A.J etc.)；《MMSE interference suppression for direct sequence spread spectrum
CDMA.》(author：U.Madhow etc.)；《Linear multi-user detection for synchronous code
division multiple access channels.》(author：R.Lupas etc.)；《Combination of an
adaptive array antenna and a canceller of interference for direct sequence
spread spectrum multiple access system.》(author：R.Kohno. etc.)；《Analytic Limits on
Performance of adaptive Multistage Interference Cancellation for CDMA.》(author：
A.Kaul etal etc.)；《Multi-user detection for CDMA systems.》(author：A.D.Hallen etc.)；Pin
The problem of to needing to know user's frequency expansion sequence in conventional multi-user detection algorithm, it is proposed that blind multi-user detection algorithm.It is blind more
User's detection algorithm has a lot, lists some representational documents here：《Multiuser detection With an
Unknown Number of Users》(author：Erik G.Larsson)、《Blind multiuser detection
using the subspace-based linearly constrained LSCMA》(author：Yan Meng etc.),《Blind
multiuser detection:a subspace approach》(author：Xiaodong Wang etc.),《Blind
multiuser detection:From MOE to Subspace Methods》(author：Zhengyuan Xu etc.),《Blind
multiuser detection using linear prediction》(author：Causey,R.T.；Deng),《Blind
multiuser detection via interference identification》(author：Ricci, G. etc.),《A
Subspace-Based Approach for the blind multiuser detection of DS CDMA Systems》
(author：Yuan-Hwang Chen etc.).
Above-described existing multiuser detection or blind multiuser detection technology, technical principle complexity be present, make
Determined, realized in Project Realization difficult with computationally intensive wait of algorithm with environment is limited.
The content of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of band spread receiver based on frequency spectrum detection
Multi-address interference supression method, this method is by during spread spectrum code acquisition, distinguishing setting signal detection threshold and multi-access inference
Detection threshold, influence of the multi-access inference to signal capture result is eliminated, avoid erroneous arrest problem, this method is simple, effective, easily
In Project Realization.
The above-mentioned purpose of the present invention is realized by following scheme：
A kind of band spread receiver multi-address interference supression method based on frequency spectrum detection, comprises the following steps：
(1) baseband receiving signals and local spread-spectrum code signals, are subjected to related progressive calculating, then in frequency domain to the phase
Close accumulation results and carry out power peak detection, the peak-peak V that record detection obtainsPEAK1；
(2), the peak-peak V for obtaining step (1) detectionPEAK1With the signal detecting threshold Th of setting1It is compared：Such as
Fruit VPEAK1≥Th1, then into step (3), if VPEAK1<Th1, then local spread-spectrum code signals phase and return to step (1) are adjusted；
(3), the peak-peak V for obtaining step (1) detectionPEAK1With the multi-access inference detection threshold Th of setting2Compared
Compared with：If VPEAK1≥Th2, then into step (4), if VPEAK1<Th2, then adjust local spread-spectrum code signals phase and return to step
Suddenly (1)；
(4) acquisition success, output capture result, are judged.
The above-mentioned band spread receiver multi-address interference supression method based on frequency spectrum detection, in step (2), signal detection door
Limit Th1Set by the following method：In the frequency domain spectral line for the related progressive result that step (1) obtains, peak-peak is removed
VPEAK1Corresponding spectral line, then calculate the mean power P of remaining each spectral line1, then setting signal detection threshold Th1=N1×P1；Its
In, N1For the first constant of setting, N1>1 and meet following condition：N1×P1≤VPEAK1/2。
The above-mentioned band spread receiver multi-address interference supression method based on frequency spectrum detection, setting constant N1=2 × M, wherein,
M is positive integer and M >=4.
The above-mentioned band spread receiver multi-address interference supression method based on frequency spectrum detection, in step (3), multi-access inference inspection
Survey thresholding Th2Set by the following method：In the frequency domain spectral line for the related progressive result that step (1) obtains, according to each spectral line
Power be ranked up, according to the third-largest peak value VPEAK3Or the fourth-largest peak value VPEAK4Set multi-access inference detection threshold Th2, i.e.,
Th2=N2×VPEAK3Or Th2=N2×VPEAK4；Wherein, N2For the second constant and N of setting2>1。
The above-mentioned band spread receiver multi-address interference supression method based on frequency spectrum detection, when jamming-to-signal ratio reduces, adjust N2
Increase.
What the present invention was brought compared with prior art has the beneficial effect that：
(1), the present invention is detected on existing catching method basis by setting signal detection threshold and multi-access inference
Thresholding, influence of the multi-access inference to capture result is eliminated, avoid erroneous arrest problem, and this method algorithm is simple, the time opens
Sell small, compared with the algorithm mended after existing wrong benefit again, effectively reduce capture time；
(2), the present invention suppresses interference effect using signal detection and multi-access inference detection, it is only necessary to is commonly used in receiver
On the basis of conventional part correlation FFT acquisition algorithms, the detection of increase useful signal and multi-access inference detection module, method letter
Single, easily realization.
Brief description of the drawings
The result schematic diagram of erroneous arrest when being and being captured when multi-access inference be present be present in Fig. 1 a；
Fig. 1 b capture correct result schematic diagram when being captured when being and multi-access inference be present；
Fig. 2 is the process chart of the band spread receiver multi-address interference supression method based on frequency spectrum detection of the present invention.
Embodiment
The present invention is described in further detail with specific embodiment below in conjunction with the accompanying drawings：
The code acquisition carried out in receiver includes Doppler carrier and captures and spread phase acquisition.Wherein,
Spacecraft product has the characteristics of Doppler frequency dynamic range is larger, therefore the part of generally use frequency domain parallel search is related
Fft algorithm, when this method carries out code acquisition, if noiseless presence or multi-access inference are weaker, when being submerged in below noise,
When locally generated pseudo-code phase is alignd with the pseudo-code phase of reception signal, FFT operation results have single peak value, by rationally setting
Respective threshold is that can detect the position that the peak value occurs, and the position is exactly Doppler shift.But if multi-access inference power compared with
Greatly, especially greater than useful signal, such as when multi-access inference power is higher than available signal power 15dB, can using the above method
The situation of erroneous arrest can occur, as shown in Figure 1a, local pseudo-code and reception signal pseudo-code have multiple peak values to occur when unjustified.
Therefore, the present invention proposes a kind of band spread receiver multi-address interference supression method based on frequency spectrum detection, adds letter
Number detection and multi-access inference detection, can avoid the wrong lock of local pseudo-code shown in Fig. 1 a with reception signal pseudo-code when unjustified existing
As again correct frequency and pseudo- code-phase can be captured (as shown in Figure 1 b) when local pseudo-code is alignd with reception signal pseudo-code
Position.
Method flow diagram as shown in Figure 2, the band spread receiver multi-access interference suppression side of the invention based on frequency spectrum detection
Method, specific implementation step are as follows：
(1) traditional part correlation FFT acquisition algorithms, are first according to, to the orthogonal reception signal for being down-converted to base band and
Local spread-spectrum code signals carry out related progressive；Then power peak detection, record are carried out to the related progressive result in frequency domain
Detect obtained peak-peak VPEAK1；
(2), the peak-peak V for obtaining step (1) detectionPEAK1With the signal detecting threshold Th of setting1It is compared：Such as
Fruit VPEAK1≥Th1, then into step (3), if VPEAK1<Th1, then local spread-spectrum code signals phase and return to step (1) are adjusted.
Setting signal detection threshold Th by the following method in this step1：In the related progressive result that step (1) obtains
Frequency domain spectral line in, remove peak-peak VPEAK1Corresponding spectral line, then calculate the mean power P of remaining each spectral line1, then set
Signal detecting threshold Th1=N1×P1；Wherein, N1For the first constant of setting, N can be set and adjusted according to received signal level1
Size, typically take N1=2 × M, M are positive integer and M >=4, but must are fulfilled for following condition：Th1≤VPEAK1/2。
(3), the peak-peak V for obtaining step (1) detectionPEAK1With the multi-access inference detection threshold Th of setting2Compared
Compared with：If VPEAK1≥Th2, then into step (4), if VPEAK1<Th2, then adjust local spread-spectrum code signals phase and return to step
Suddenly (1).
Set multi-access inference detection threshold Th by the following method in this step2：In the related progressive that step (1) obtains
As a result in frequency domain spectral line, it is ranked up according to the power of each spectral line, according to the third-largest peak value VPEAK3Or the fourth-largest peak value VPEAK4
Set multi-access inference detection threshold Th2, i.e. Th2=N2×VPEAK3Or Th2=N2×VPEAK4；Wherein, N2For the second constant of setting
And N2>1.The present invention needs to be emulated under the conditions of various jamming-to-signal ratios and site-test analysis so that the N of setting2Meet following bar
Part：When reception signal is multi-access inference, or reception signal is the superposed signal of useful signal and multi-access inference and local puppet
Code is with useful signal pseudo-code when not aliging, the peak maximum V that step (1) detectsPEAK1<Th2；When reception signal is useful
Signal and the superposed signal of multi-access inference and when local pseudo-code is alignd with useful signal pseudo-code, VPEAK1≥Th2, so could be effectively
Suppress multi-access inference and cause erroneous arrest.In the present embodiment, in multi-access inference 15dB higher than available signal power, N2Desirable 4 or 5
Or 6, when being reduced with the ratio between multi-access inference and useful signal, N2 can suitably increase.
(4) acquisition success, output capture result, are judged.
The band spread receiver multi-address interference supression method based on frequency spectrum detection of the present invention, produced by actual spacecraft observing and controlling
Product are verified, obvious to the inhibition of multi-access inference, suitable for the multi-access inference situation with useful signal spreading code for code of the same clan.
And the condition such as the use of the inventive method and spreading code bit rate, Doppler shift, spreading code sliding step is unrelated, with expansion
The increase in frequency code cycle, the cross correlation between code of the same clan can improve, and the ability of multi-access interference suppression is carried out using the present invention
It can increase.
It is described above, it is only an embodiment of the invention, but protection scope of the present invention is not limited thereto, and is appointed
What those familiar with the art the invention discloses technical scope in, the change or replacement that can readily occur in, all
It should be included within the scope of the present invention.
The content not being described in detail in description of the invention belongs to the known technology of professional and technical personnel in the field.
Claims (3)
- A kind of 1. band spread receiver multi-address interference supression method based on frequency spectrum detection, it is characterised in that：Comprise the following steps：(1) baseband receiving signals and local spread-spectrum code signals, are subjected to related progressive calculating, then in frequency domain to described related tired Product result carries out power peak detection, the peak-peak V that record detection obtainsPEAK1；(2), the peak-peak V for obtaining step (1) detectionPEAK1With the signal detecting threshold Th of setting1It is compared：If VPEAK1≥Th1, then into step (3), if VPEAK1<Th1, then local spread-spectrum code signals phase and return to step (1) are adjusted；Its In, signal detecting threshold Th1Set by the following method：In the frequency domain spectral line for the related progressive result that step (1) obtains, peak-peak V is removedPEAK1Corresponding spectral line, then calculate The mean power P of remaining each spectral line1, then setting signal detection threshold Th1=N1×P1；Wherein, N1For the first constant of setting, N1>1 and meet following condition：N1×P1≤VPEAK1/2；(3), the peak-peak V for obtaining step (1) detectionPEAK1With the multi-access inference detection threshold Th of setting2It is compared：Such as Fruit VPEAK1≥Th2, then into step (4), if VPEAK1<Th2, then local spread-spectrum code signals phase and return to step (1) are adjusted； Wherein, multi-access inference detection threshold Th2Set by the following method：In the frequency domain spectra for the related progressive result that step (1) obtains In line, it is ranked up according to the power of each spectral line, according to the third-largest peak value VPEAK3Or the fourth-largest peak value VPEAK4Set multi-access inference Detection threshold Th2, i.e. Th2=N2×VPEAK3Or Th2=N2×VPEAK4；Wherein, N2For the second constant and N of setting2>1；(4) acquisition success, output capture result, are judged.
- 2. a kind of band spread receiver multi-address interference supression method based on frequency spectrum detection according to claim 1, its feature It is：Set constant N1=2 × M, wherein, M is positive integer and M >=4.
- 3. a kind of band spread receiver multi-address interference supression method based on frequency spectrum detection according to claim 1, its feature It is：When jamming-to-signal ratio reduces, N is adjusted2Increase.
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