CN103248595B - A kind of self adaptation is with location interference cancellation method and device - Google Patents

A kind of self adaptation is with location interference cancellation method and device Download PDF

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CN103248595B
CN103248595B CN201310166578.XA CN201310166578A CN103248595B CN 103248595 B CN103248595 B CN 103248595B CN 201310166578 A CN201310166578 A CN 201310166578A CN 103248595 B CN103248595 B CN 103248595B
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filter
interference
order filter
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谢跃雷
欧阳缮
刘洁
晋良念
陈紫强
刘庆华
蒋俊正
肖海林
丁勇
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Guilin University of Electronic Technology
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Abstract

The present invention discloses a kind of self adaptation with location interference cancellation method and device, and it adopts multiple reference-input signal, and is divided into by filtering two stages to process signal, to suppress multiple same locations interference signal.The same location interference that the present invention can effectively suppress multi-section equipment to produce, and only need carry out data acquisition at reception antenna place, without the need to the coupling harvester of interference signal, adaptive interference cancelling module is simplified, be more applicable to operational environment narrow in real time.

Description

A kind of self adaptation is with location interference cancellation method and device
Technical field
The present invention relates to wireless communication field, be specifically related to a kind of self adaptation with location interference cancellation method and device.
Background technology
In vehicle-mounted, carrier-borne and airborne wireless communicate, often need to arrange multi-section radio station on a communications platform, when these radio station work simultaneously, because its antenna distance is very near, transmitter and receiver transmitting-receiving level differs greatly, receiver will be coupled into the signal that a large amount of neighbouring transmitter sends usually, and Here it is disturbs with location.When the transmission signal power of neighbouring transmitter is very large, the strong jamming level of generation generally can exceed the dynamic range of contiguous receiver, causes receiver to block, and forms communication disruption.Therefore, how effectively to suppress to have been a great deal of attention with location interference.
The method that current solution is disturbed with location is mainly carried out from hardware and software two aspects, the design and processes method of whole communication system, circuit engineering is optimized by hardware, improve the performance of electronic equipment, reduce the level magnitudes of interference source, increase the decay and the antijamming capability that improve equipment etc. of interference source on propagation path.On software, master is locus and the frequency spectrum of wanting each communication equipment of reasonable distribution, to reduce the interference of same location.These methods all have certain limitation, and when interference level is excessive, inhibition is by severe exacerbation.
In order to further offset interference signal, adaptive interference cancelling technology starts the research direction becoming people, the Received signal strength that introducing Adaptive Signal Processing module is right between antenna and receiver carries out the process of adaptive interference cancelling, high-power interference signal can be eliminated to a great extent, the normal work of receiver below can not be had influence on again.Conventional adaptive interference cancelling algorithm mostly carries out based on ADAPTIVE LMS ALGORITHM, for same location interference signal high power and time become characteristic, be born the New variable step-size LMS of a lot of improvement, amount of calculation is little, fast convergence rate, and change the adaptive algorithm of filter construction, also be improved the correlation of signal to increase the cancellation level of interference signal, these methods all have good effect in process with in the interference signal of location, but when same location interference source increasing number, need at each interference transmitting antenna place's coupled flutter and gather, the interference signal collecting device of adaptive interference cancelling module is made to become complicated, increase burden to limited working space.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of self adaptation with location interference cancellation method and device, the same location interference that can effectively suppress multi-section equipment to produce, and only need carry out data acquisition at reception antenna place, without the need to the coupling harvester of interference signal, adaptive interference cancelling module is simplified, is more applicable to operational environment narrow in real time.
For solving the problem, the present invention is achieved by the following scheme:
A kind of self adaptation, with location interference cancellation method, comprises the steps:
The first step, is taken into N road signal after the signal received by the antenna of receiving terminal carries out over-sampling, wherein over-sampling speed is f s, the equivalent sampling speed extracting Hou Mei road is f es, have f s=Nf es, and f esand sampling theorem should be met between Received signal strength and require f es>=2f max, f maxfor the highest frequency of Received signal strength;
Second step, in the pure interference stage, before namely transmitting-receiving radio station receives catchword, the stage that communication link is not set up; Now reception antenna receives signal and only comprises same location interference signal and noise, makes now over-sampling the N road signal extracted is x 1, x 2..., x n, choose any road in this N road signal as main channel signal and x 1, other N-1 road signals are then as reference channel signal and x 2, x 3..., x n;
3rd step, by x 2, x 3..., x nn-1 road reference channel signal is input in first order filter altogether, and adjusts first order filter coefficient, makes first order filter output signal and main channel signal x 1the power subtracting each other errors signal is minimum;
4th step, containing useful signal phase, namely receives and dispatches between radio station through wailing, shaking hands, the stage after intercommunication link establishment; The signal that now reception antenna receives is useful signal s, with location interference signal and noise, makes the N road signal that now over-sampling also extracts be x 1+ s 1, x 2+ s 2..., x n+ s n, choose any road in this N road signal as main channel signal and x 1+ s 1, other N-1 road signals are then as reference channel signal and x 2+ s 2, x 3+ s 3..., x n+ s n;
5th step, by x 2+ s 2, x 3+ s 3..., x n+ s nn-1 road reference channel signal is input in first order filter altogether, and keeps first order filter coefficient constant, by the output signal of first order filter and main channel signal x 1+ s 1error signal after subtracting each other is as the input of second level filter;
6th step, adjustment second level filter coefficient, makes output signal and the main channel signal x of second level filter 1+ s 1the power subtracting each other errors signal is minimum, and now the output signal of second level filter is the useful signal recovered.
In the above-mentioned methods, the signal of reception extracts as N road signal after over-sampling, and the value of N is larger, and the performance of algorithm is better, but required sampling rate is higher, and hard-wired difficulty is larger, considers the value of desirable N between 2 ~ 8.
Described first order filter and second level filter are sef-adapting filter.
A kind of self adaptation that can realize said method, with location Interference Cancellation device, forms primarily of withdrawal device, first order filter and second level filter; Wherein the input of withdrawal device and reception antenna are coupled; 1 main channel output access first order filter in N number of output of withdrawal device and the control end of second level filter, N-1 reference channel output is connected with the input of first order filter; The input of the output access second level filter of first order filter, the output of second level filter is coupled to the input of receiver.
The output number N of described withdrawal device is between 2 ~ 8.
Described first order filter and second level filter are sef-adapting filter.
With traditional with compared with the interference cancellation algorithm of location, the present invention has following advantage:
(1) without the need to signal coupling harvester.Traditional self adaptation needs to draw interference signal from potato masher antenna coupling respectively with location interference cancellation method and carries out adaptive interference cancelling as coherent signal, and this method obtains coherent signal by mode Received signal strength being taken into N road signal.
(2) interference of multi-section equipment can effectively be suppressed.When interference signal quantity is too much, traditional self-adaption interference cancellation method offsets interference signal one by one by adaptive interference cancelling mode after needing to draw interference, and the impact of the interference-free quantity of Interference Cancellation process of this method.
(3) more narrow operational environment is applicable to.This method only need be coupled out from receiving terminal the process that signal carries out adaptive interference cancelling, utilizes the difference of useful signal and other interference signal frequencies to offset interference signal, recovers useful signal.
Accompanying drawing explanation
Fig. 1 is same location Interference Cancellation application of installation theory diagram.
Fig. 2 is dual stage filter noise cancellation algorithm principle figure.
Fig. 3 (a) error rate is with N change curve.
Fig. 3 (b) error rate is with f eschange curve.
Fig. 4 be in multi-jamming sources situation many reference inputs with location interference cancellation algorithm and tradition with the comparison of location interference cancellation algorithm power spectrum chart.
Fig. 5 be in multi-jamming sources situation many reference inputs with location interference cancellation algorithm and tradition with the comparison of the error rate under this multipath channel of interference cancellation algorithm Lay of location.
Embodiment
The present invention propose a kind of many reference inputs newly with location Interference Cancellation device application principle as shown in Figure 1, a kind of self adaptation shown in figure, with location Interference Cancellation device, forms primarily of withdrawal device, first order filter and second level filter.Wherein the input of withdrawal device and reception antenna are coupled.1 main channel output access first order filter in N number of output of withdrawal device and the control end of second level filter, N-1 reference channel output is connected with the input of first order filter.The input of the output access second level filter of first order filter, the output of second level filter is coupled to the input of receiver.In the present invention, the value of the output number N of withdrawal device is larger, and the performance of algorithm is better, but required sampling rate is higher, and hard-wired difficulty is larger.Through considering, in a preferred embodiment of the invention, the output number N of withdrawal device is between 2 ~ 8.Wherein first order filter and second level filter are sef-adapting filter.
Transmitter 1 is that n is individual with the communication equipment of receiver s at same working space to transmitter n, receiver s receives the signal that another working space transmitter sends, because n transmitter distance of receiver s and same working space is very near, the signal easily received machine s front end receiver that transmitter 1 sends to transmitter n, useful signal is received to receiver s and causes interference, therefore the signal that receiver front end receives is the mixed signal of multiple interference signal and useful signal, and mixed signal Y is Y=I 1+ I 2+ ...+I n+ R s, I in formula 1, I 2..., I nfor interference signal, R sfor useful Received signal strength.
Multiple reference-input signal is obtained by being taken into multiple signals after the mixed signal over-sampling received, and the dual stage filter noise cancellation algorithm principle figure according to Fig. 2 is divided into two stages to carry out adaptive-filtering process to signal filtering, based on frequency different of useful signal and other interference signals, the weight coefficient of filter tracks useful signal is different with the weight coefficient of tracking interference signal, thus offset interference, recover useful signal.
A kind of self adaptation that said apparatus realizes, with location interference cancellation method, comprises the steps:
The first step, is taken into N road signal after the signal received by the antenna of receiving terminal carries out over-sampling, wherein over-sampling speed is f s, the equivalent sampling speed extracting Hou Mei road is f es, have f s=Nf es, and f esand sampling theorem should be met between Received signal strength and require f es>=2f max, f maxfor the highest frequency of Received signal strength;
Second step, in the pure interference stage, before namely radio station receives catchword, the stage that communication link is not set up; Now reception antenna receives signal and only comprises same location interference signal and noise, makes now over-sampling the N road signal extracted is x 1, x 2..., x n, choose any road in this N road signal as main channel signal and x 1, other N-1 road signals are then as reference channel signal and x 2, x 3..., x n;
3rd step, by x 2, x 3..., x nn-1 road reference channel signal is input in first order filter altogether, and adjusts first order filter coefficient, makes first order filter output signal and main channel signal x 1the power subtracting each other errors signal is minimum;
4th step, containing useful signal phase, namely receives and dispatches between radio station through wailing, shaking hands, the stage after intercommunication link establishment; The signal that now reception antenna receives is useful signal s, with location interference signal and noise, makes the N road signal that now over-sampling also extracts be x 1+ s 1, x 2+ s 2..., x n+ s n, choose any road in this N road signal as main channel signal and x 1+ s 1, other N-1 road signals are then as reference channel signal and x 2+ s 2, x 3+ s 3..., x n+ s n;
5th step, by x 2+ s 2, x 3+ s 3..., x n+ s nn-1 road reference channel signal is input in first order filter altogether, and keeps first order filter coefficient constant, by the output signal of first order filter and main channel signal x 1+ s 1error signal after subtracting each other is as the input of second level filter;
6th step, adjustment second level filter coefficient, makes output signal and the main channel signal x of second level filter 1+ s 1the power subtracting each other errors signal is minimum, and now the output signal of second level filter is the useful signal recovered.
No matter that it is 2 ~ 8 road signals that the signal of reception extracts after over-sampling in the pure interference stage or containing useful signal phase.First order filter and second level filter are sef-adapting filter.Namely the noise cancellation algorithm of dual stage filter uses two-stage adaptive filtering system to carry out filtering, whole filtering comprises two stages: (1) pure interference signal stage (mixed signal that receiver collects, not containing useful signal, only contains multiple interference signal).(2) containing useful signal phase (mixed signal that receiver collects is simultaneously containing useful signal and multiple interference signal).
The mixed signal Y received is taken into N road signal by withdrawal device, first in the pure interference signal stage, D 1the pure interference signal x in road 1be set to main channel signal, D 2d 3... D nthe pure interference signal x in road 2x 3... x nbe set to reference channel signal, the object in this stage is with reference channel signal cancellation main channel signal x 1.See Fig. 2.
Be described for the adaptive noise canceling of two-way (namely system only has a road reference channel signal except main channel signal) below, the mixed signal now collected by receiver is by the extraction of odd even formula, and one-channel signal becomes two paths of signals x 1x 2, x 2x is offset as with reference to channel signal input first order filter 1, adjustment first order filter coefficient, the mean-square value of the difference that first order filter is exported between main channel signal reaches minimum, has
e ( n ) = x 1 ( n ) - w 2 x 2 ‾ ( n )
x 2 ‾ ( n ) = [ x 2 ( n ) , x 2 ( n - 1 ) , . . . , x 2 ( n - L + 1 ) ] T
w 2=[w 21,w 22,...w 2L]
Wherein, L is filter order, w 2for filter coefficient, e is signal x 2offset x 1predicated error, the size of predicated error is directly connected to the cancellation level of interference, if x 2with x 1correlation larger, the neutralization effect of interference is better, so can use multichannel reference channel signal x 2x 3... x noffset x 1, have
e ( n ) = x 1 ( n ) - w x ‾ ( n )
x ‾ ( n ) = [ x ‾ 2 ( n ) , x ‾ 3 ( n ) , . . . , x ‾ N ( n ) ] T x ‾ i ( n ) = [ x i ( n ) , x i ( n - 1 ) , . . . , x i ( n - L + 1 ) ]
w=[w 2,w 3,...,w N]
w i=[w i1,w i2,...w iL]
Then, containing useful signal phase, N road mixed signal is obtained in the same way by withdrawal device, due to substantially constant in the signal transmission environment short time, and in actual working environment, different operating frequencies will be distributed according to frequency allocation plan usually in radio station in the same space, namely be different with the frequency of location interference signal and useful signal frequency, therefore based on frequency different of useful signal and other interference signals, the weight coefficient of filter tracks useful signal is different with the weight coefficient of tracking interference signal, can using first order filter as fixed filters, keep first order filter coefficient constant, reach the object offsetting interference signal, now main channel signal is x 1+ s 1, reference channel signal is x 2+ s 2, x 3+ s 3..., x n+ s nso, have
y 1 ( n ) = w * · ( s ‾ ( n ) + x ‾ ( n ) ) s ‾ ( n ) = [ s ‾ 2 ( n ) , s ‾ 3 ( n ) , . . . , s ‾ N ( n ) ] T
s ‾ i ( n ) = [ s i ( n ) , s i ( n - 1 ) , . . . , s i ( n - 1 ) ]
e 1 ( n ) = x 1 ( n ) + s 1 ( n ) - y 1 ( n )
= x 1 ( n ) s 1 ( n ) - w * s ‾ ( n ) - w * x ‾ ( n ) = s 1 ( n ) - w * s ‾ ( n ) + e
Wherein, w *for optimal filter coefficients, e is the optimum prediction error obtained in the pure interference signal stage.Now e 1s 1distorted signal, with s 1relevant, by e 1as the input of second level filter, adjust the coefficient of the whole filter in the second level, make the mean-square value of the output of second level filter and the difference of main channel signal reach minimum, the useful signal after the output signal of this second level filter and de-noising.Because,
e 2(n)=x 1(n)+s 1(n)-y 2(n)
y 2 ( n ) = e ‾ 1 ( n ) · ww
e 1 ‾ ( n ) [ e 1 ( n ) , e 1 ( n - 1 ) , . . . , e 1 ( n - L 1 + 1 ) ] T
ww=[ww 1,ww 2,...ww L1]
E [ e 2 2 ( n ) ] = E { [ x 1 ( n ) + s 1 ( n ) - y 2 ( n ) ] 2 }
= E { [ x 1 ( n ) ] 2 } + E { [ s 1 ( n ) - y 2 ( n ) ] 2 }
+ E { 2 x 1 ( n ) [ s 1 ( n ) - y 1 ( n ) ] }
Wherein, ww is the coefficient of filter B, L 1for the exponent number of filter B.As can be seen from formula, minimum in order to reach mean square error, might as well suppose that interference signal is uncorrelated with useful signal, so there is E{2x 1(n) [s 1(n)-y 1(n)] }=0, namely make E [(s 1-y 2) 2] minimum, i.e. y 2≈ s 1, namely second level filter exports and is the useful signal recovered.
The present invention is based on the same location interference cancellation systems model of Direct-Spread, arrange three interference signals and useful signal is direct sequence signal, information code bit rate is 58kbps, and spreading code is the gold code of length 15, adopts BPSK modulation.Useful signal frequency is 5MHz, and three interference signal frequencies are respectively 8MHz, 10MHz, 12MHz.With this multipath channel of Lay that location interference channel is three footpaths, signal to noise ratio is 25dB, 26dB, 28dB, interference signal amplitude is respectively 8,9,10 times of useful signal amplitude, and first order filter order is 6, and second level filter order is 2, traditional many reference inputs are 4, f with the filter order of location interference cancellation method esin units of the multiple receiving the bandwidth of useful signal.
In Fig. 3 (a), two curves of BER Simulation, are followed successively by f from top to bottom es=40 and f esber curve when=30, when the way extracted is identical, f esless, namely the sampling number of each shunting sign is fewer, and the error rate is higher; Work as f esone timing, i.e. sampling number one timing of each shunting sign, the way of signal extraction is more, and the error rate is lower.In Fig. 3 (b), two curves of BER Simulation, are followed successively by ber curve during N=3 and N=4 from top to bottom, and emulation finds, when Received signal strength is taken into three tunnels, and f esduring >140, the error rate is less than 10 -3, can communicating requirement be met; When Received signal strength is taken into four tunnels, f esduring >120, the error rate is less than 10 -3, can communicating requirement be met.
In Fig. 4, the display of first power spectral density be the power distribution of the mixed signal received, can find out that main channel signal is the mixed signal containing four frequency contents, be respectively useful signal and the 8MHz of 5MHz, 10MHz, the interference signal of 12MHz, and interfering signal power is stronger than useful signal 100 times, the power distribution of to be frequency the be 5MHz useful signal of second power spectral density display, two power spectral densities next are followed successively by and adopt single reference input to suppress the power disturbing the useful signal recovered to distribute with location interference cancellation algorithm (N=2) and many reference inputs with location interference cancellation algorithm (N=3), can find out in the same location interference cancellation algorithm power spectrum chart of many reference inputs, its Energy distribution situation is basic consistent with useful signal, and frequency is 8MHz, 10MHz, the interference signal also basic filtering of 12MHz, and single reference input is with finding in the power spectrum chart of location interference cancellation algorithm, still there is a small amount of interference signal frequency content not to be cancelled completely.
Two curves in Fig. 5, are followed successively by single reference input from top to bottom with location interference cancellation algorithm (N=2) and the many reference inputs BER Simulation with location interference cancellation algorithm (N=3).Simulation result shows, the same location interference cancellation algorithm of many reference inputs obviously obtains better bit error rate performance than the same location interference cancellation algorithm of single reference input, and many reference inputs still can reach 10 with location Interference Cancellation error rate when signal interference ratio is-20dB -3, meet communicating requirement.
The present invention is directed to actual same location interference cancellation systems, by the filtering in two stages, only adopt a road Received signal strength to be taken into multiple signals to obtain coherent signal and carry out adaptive interference cancelling, when same location interference signal quantity is too much, still the signal processing module of good Interference Cancellation effect and simplification can be had, essence improves sample rate to simplify for cost exchanges in structure, compares traditional self adaptation and more can be applicable to space-constrained multi-section equipment co-operation with location interference cancellation algorithm.In addition, when same location interference environment changes, will worsen with location interference cancellation algorithm performance, cause interrupted communication link.Now, transceiver communication both sides need again to be shaken hands by catchword to set up link, many reference inputs self adaptation will repeat two above stages with location interference cancellation algorithm, and this and adaptive algorithm are after environmental condition changes, and needing certain hour again to restrain is identical in essence.

Claims (6)

1. self adaptation is with a location interference cancellation method, it is characterized in that comprising the steps:
The first step, is taken into N road signal after the signal received by the antenna of receiving terminal carries out over-sampling, wherein over-sampling speed is f s, the equivalent sampling speed extracting Hou Mei road is f es, have f s=Nf es, and f esand sampling theorem should be met between Received signal strength and require f es>=2f max, f maxfor the highest frequency of Received signal strength;
Second step, in the pure interference stage, namely receive and dispatch radio station receive catchword before, the communication link unfounded stage; Now reception antenna receives signal and only comprises same location interference signal and noise, makes now over-sampling the N road signal extracted is x 1, x 2..., x n, choose any road in this N road signal as main channel signal and x 1, other N-1 road signals are then as reference channel signal and x 2, x 3..., x n;
3rd step, by x 2, x 3..., x nn-1 road reference channel signal is input in first order filter altogether, and adjusts first order filter coefficient, makes first order filter output signal and main channel signal x 1the power subtracting each other errors signal is minimum;
4th step, containing useful signal phase, namely receive and dispatch between radio station through wail and shake hands, stage after intercommunication link establishment; The signal that now reception antenna receives is useful signal s, with location interference signal and noise, makes the N road signal that now over-sampling also extracts be x 1+ s 1, x 2+ s 2..., x n+ s n, choose any road in this N road signal as main channel signal and x 1+ s 1, other N-1 road signals are then as reference channel signal and x 2+ s 2, x 3+ s 3..., x n+ s n;
5th step, by x 2+ s 2, x 3+ s 3..., x n+ s nn-1 road reference channel signal is input in first order filter altogether, and keeps first order filter coefficient constant, by the output signal of first order filter and main channel signal x 1+ s 1error signal after subtracting each other is as the input of second level filter;
6th step, adjustment second level filter coefficient, makes output signal and the main channel signal x of second level filter 1+ s 1the power subtracting each other errors signal is minimum, and now the output signal of second level filter is the useful signal recovered.
2. a kind of self adaptation according to claim 1 is with location interference cancellation method, it is characterized in that, it is 2 ~ 8 road signals that the signal of reception extracts after over-sampling, and namely the value of N is between 2 ~ 8.
3. a kind of self adaptation according to claim 1 is with location interference cancellation method, it is characterized in that, first order filter and second level filter are sef-adapting filter.
4. based on a kind of self adaptation according to claim 1 with a kind of self adaptation designed by the interference cancellation method of location with location Interference Cancellation device, it is characterized in that, form primarily of withdrawal device, first order filter and second level filter; Wherein the input of withdrawal device and reception antenna are coupled; 1 main channel output access first order filter in N number of output of withdrawal device and the control end of second level filter, N-1 reference channel output is connected with the input of first order filter; The input of the output access second level filter of first order filter, the output of second level filter is coupled out the input to receiver.
5. a kind of self adaptation according to claim 4 is with location Interference Cancellation device, it is characterized in that, the output number N of withdrawal device is between 2 ~ 8.
6. a kind of self adaptation according to claim 4 is with location Interference Cancellation device, it is characterized in that, described first order filter and second level filter are sef-adapting filter.
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