CN114640362A - Double-receiving-unit joint anti-interference method based on propagation delay difference - Google Patents
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- H—ELECTRICITY
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
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Abstract
The invention discloses a double-receiving unit joint anti-interference method based on propagation delay difference. The method comprises the following steps: (1) the receiving unit 1 and the receiving unit 2 simultaneously receive a useful signal and an interference signal; (2) down-converting the A path signal and the B path signal to a frequency band suitable for sampling; (3) sampling the signals of the A path and the B path after down conversion, (4) comparing the time delay between the sampling signals of the A path and the B path, and estimating a time delay adjustment value N1 of the A path and a time delay adjustment value N2 of the B path; (5) delaying the A path of sampling signals for N1 × T seconds, and delaying the B path of sampling signals for N2 × T seconds; (6) performing combined processing on the delayed A path sampling signal and the B path sampling signal to obtain a mixed signal of useful signals in the delayed step 3B path sampling signal; (7) processing the mixed signal in the step (6) to obtain a useful signal; (8) and (4) demodulating the useful signal in the step (7). The invention obtains useful signals based on the time delay among signals received by 2 receiving units.
Description
Technical Field
The invention relates to an anti-interference method of a communication system, in particular to a double-receiving unit joint anti-interference method of radio signal time delay difference caused by different propagation distances, belonging to the technical field of communication.
Background
Radio is an electromagnetic wave that propagates in free space. Radio communication is a communication method for transmitting information in space by using radio electromagnetic waves. The radio communication does not need to establish a communication line, has long communication distance, good maneuverability and quick establishment and is widely applied to the fields of military and civil communication. However, wireless communication is susceptible to natural factors and interference signals, and communication quality is unstable. Anti-interference is always a hot point of research in the field of wireless communication. Especially, under the condition that the power of the interference signal is much larger than the power of the useful signal, how to cancel the interference signal and realize the correct reception of the useful signal is always the key point and the difficulty of the research of the wireless communication anti-interference technology.
At present, under the condition that the interference signal power is far greater than the useful signal power, a common method for keeping smooth communication is to deploy an antenna array at a receiving end, and suppress the interference signal by utilizing the sidelobe characteristics of antenna array elements and the correlation between the array elements. In the method, a useful signal is assumed to be S (t), and an interference signal is assumed to be K (t); array element A1The main lobe of (A) points to S (t), which is the direct array element of S (t); array element A2The main lobe of (A) points to K (t), which is the direct array element of K (t); array element A1The received signal is A1(t) ═ s (t) + ξ k (t) + n (t), array element a2The received signal is A2(t) ═ ζ S (t) + K (t) + n (t), where ξ, ζ are side lobe attenuation factors, ξ, ζ are side lobe attenuation factors<<1, the distance between the array elements is small, so that the time delay of the transmission signal reaching different array elements is negligible. Xi A can be deduced by using the formula2(t)＝ξζS(t)+ξK(t)+n(t)，A1(t)-ξA2(t) ═ s (t) - ξ s (t) + n (t). Since ξ S (t) can be regarded as an infinitesimal quantity, it can be composed ofThe two array elements are weighted and differenced to obtain a transmission signal S (t), and the antenna array with N array elements can solve the transmission signal under the condition of N-1 interference sources at most.
However, the above-mentioned scheme is only applicable to a scenario where the interfering signal source, the useful signal source, and the receiving antenna array are not in the same straight line, when the interfering signal source, the useful signal source, and the antenna array are in the same straight line, the direct-radiation array elements of the interfering signal source and the useful signal source are the same array element, and the receiving system cannot cancel the influence of the interfering signal by using the side lobe characteristics of the antenna array element, and the method is ineffective.
The invention provides a double-receiving-unit joint anti-interference method based on propagation delay difference, aiming at the scenes that an interference signal source and a useful signal source are positioned in approximate directions relative to a receiving antenna, the influence of the interference signal cannot be counteracted by utilizing the side lobe characteristic of an antenna array element, and the power of an interference signal K (t) is far greater than that of a useful signal S (t). Propagation delay refers to the time it takes for an electromagnetic wave to travel a certain distance in a channel. The propagation delay is equal to the channel length divided by the propagation rate. The rate of propagation of electromagnetic waves in free space is the speed of light, i.e. 3 x 108km/s. The method utilizes two receiving units positioned at different spatial positions to eliminate the influence of interference signals and realize the acquisition of useful signals due to the difference of signal propagation delay caused by the difference of the distances between the two receiving units and a signal source and an interference source.
Disclosure of Invention
In order to overcome the above-mentioned drawbacks, the present invention provides a method for jointly resisting interference by using two receiving units based on propagation delay differences, which utilizes the difference of propagation delays of received signals between two receiving units located at different spatial positions to eliminate the influence of interference signals with power much greater than that of useful signals, thereby achieving the acquisition of useful signals.
In order to achieve the above object, the present invention provides a dual receiving unit joint anti-interference method based on propagation delay difference, which comprises the following steps:
(1) the antennas of the receiving unit 1 and the receiving unit 2 receive useful signals and interference signals from a free space at the same time, and the signals received by the receiving unit 1 are A-path signals, and the signals received by the receiving unit 2 are B-path signals;
(2) down-converting the A path signal and the B path signal in the step (1) to a frequency band suitable for sampling;
(3) sampling the signals of the path A and the path B after down-conversion in the step (2) by using the same clock, wherein the sampling interval is T seconds;
(4) comparing the time delay between the A path sampling signal and the B path sampling signal, and estimating an A path time delay adjusting value N1 and a B path time delay adjusting value N2;
(5) delaying the A path of sampling signals for N1 × T seconds, and delaying the B path of sampling signals for N2 × T seconds;
(6) performing combined processing on the A path of sampling signals and the B path of sampling signals delayed in the step (5), eliminating interference signals, and obtaining a mixed signal of useful signals in the step 3A path of sampling signals delayed for N1T seconds and useful signals in the step 3B path of sampling signals delayed for N2T seconds;
(7) processing the mixed signal in the step (6) to obtain a useful signal;
(8) and (4) demodulating the useful signal in the step (7) to obtain data.
In the above method, the receiving unit 1 and the receiving unit 2 are located at different spatial positions.
In the above method, the positions of the useful signal source and the interfering signal source do not overlap.
In the above method, the signals received by the receiving unit 1 and the receiving unit 2 in step 1 are mixed signals of the useful signal and the interference signal.
In the above method, the interference signal power received by the receiving unit 1 and the receiving unit 2 is much larger than the useful signal power.
In the above method, the step 4A sampled signal is a down-converted and sampled signal of the mixed signal received by the receiving unit 1 in step 1
In the method, the step 4B path sampling signal is the down-converted and sampled signal of the mixed signal received by the receiving unit 2 in the step 1
In the method, the difference between the propagation delays of the interference signal received by the path a and the interference signal received by the path B can be estimated approximately based on the delay between the path a sampling signal and the path B sampling signal in step 4.
In the above method, the values of N1 and N2 in step 4 are the number of sampling points.
In the method, the propagation delay difference of the interference signals in the path a signal and the path B signal delayed in step 5 is approximately 0.
In the above method, the mixed signal of step 5 includes 2 useful signals with different propagation delays.
In the above method, the antennas of the receiving unit 1 and the receiving unit 2 are installed at positions that ensure that the interference signals can be cancelled and the useful signals cannot be cancelled.
The double-receiving-unit joint anti-interference method based on propagation delay difference has the following advantages:
1. the invention is especially suitable for the condition of strong interference that the interference signal power is far larger than the useful signal power.
2. The invention utilizes the difference of the propagation time delay of the useful signal and the interference signal received by the antennas of 2 receiving units positioned at different spatial positions to counteract the interference signal and obtain the useful signal.
3. The invention can use directional antenna and non-directional antenna.
4. The receiving end of the invention does not need to know the specific positions of the signal source and the interference source.
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FIG. 1 is a flow chart of a dual receiving unit joint anti-interference method based on propagation delay difference
Detailed Description
The invention will be further described with reference to the accompanying drawings.
The flow of the dual receiving unit joint anti-interference method based on propagation delay difference is shown in fig. 1. In fig. 1, 2 receiving units are disposed at a receiving end, and receive signals transmitted by a useful signal source and an interference signal source. The interference signal power radiated by the interference signal source is far larger than the useful signal power radiated by the useful signal source. P is the position of the useful signal source, Q is the position of the interference signal source, G is the position of the antenna of the receiving unit 1, and H is the position of the antenna of the receiving unit 2. The distance between G and H is such that the interfering signal is cancelled, but the desired signal is not cancelled.
The 2 receiving units in fig. 1 are composed of respective antennas, down converters, sampling modules, and delay modules. The performance indexes of the antenna and the down converter of the 2 receiving units are completely the same, the sampling modules use the same clock, and the sampling intervals are all T seconds. After down-conversion and sampling, signals received by the antenna 1 and the antenna 2 respectively enter respective delay modules on one hand, and simultaneously enter a delay estimation module on the other hand. The delay estimation module estimates the delay among the signals received by the 2 antennas in real time and provides a receiving unit 1 interference signal delay adjustment value N1 and a receiving unit 2 interference signal delay adjustment value N2. The delay module 1 delays the sampling signal of the antenna 1 by N1 × T seconds, and the delay module 2 delays the sampling signal of the antenna 2 by N2 × T seconds. And the delayed mixed signal enters an interference cancellation module to be processed, so that the interference signal is eliminated, and the mixed signal consisting of useful signals with different time delays is obtained. The useful signal extraction module separates the mixed signals of the useful signals with different propagation time delays, which are received by the 2 receiving units, so as to obtain the useful signals, and the useful signals are demodulated.
Assuming that the performance indexes of the antennas and the down converters of the receiving unit 1 and the receiving unit 2 are completely the same, and ignoring the difference of signal amplitude attenuation caused by different propagation distances, only the difference of propagation delay exists between the useful signal and the interference signal received by the receiving unit 1 and the receiving unit 2. Let the analog mixed signal received by the receiving unit 1 be A1(t) the analog mixed signal received by the receiving unit 2 is A2(t), then:
A1(t)＝S(t)+K(t-△t1)+n1(t) (1)
A2(t)＝S(t-△t2)+K(t-△t3)+n2(t) (2)
in the formula (1), s (t) is a useful signal received by the receiving unit 1, K (t- Δ t)1) For the interference signal received by the receiving unit 1, n1(t) is the noise of the receiving unit 1, S (t- Δ t) in equation (2)2) For the useful signal received by the receiving unit 2, K (t- Δ t)3) For interference received by the receiving unit 2Signal, n2(t) is noise of the receiving unit 2.Δ t in formula (1)1Is the difference between the propagation delays of path QG and path PG,. DELTA.t2Is the difference between the propagation delays of path PH and path PG,. DELTA.t3Is the difference between the propagation delays of path QH and path PG. For clarity of presentation, the noise n is omitted in the subsequent formula derivation1(t) and n2(t)。
After receiving unit 1 and receiving unit 2 sample the received analog mixed signal, the obtained digital signal is represented as follows:
A1(k)＝S(k)+K(k-△k1) (3)
A2(k)＝S(k-△k2)+K(k-△k3) (4)
to A1(k)，A2(k) Performing correlation processing to obtain A1(k) And A2(k) The time delay between the two signals is greater than the power of the useful signal, so the time delay can be determined by A1(k) And A2(k) The difference Deltak between the propagation delays of the interference signals received by the receiving unit 1 and the receiving unit 2 is estimated approximately, i.e. the delay between
△k＝△k3-△k1 (5)
A is to be1(k) Delay Δ k, and A2(k) By subtraction, A can be cancelled1(k) The noise signal in (b) is only a mixed signal composed of useful signals with different time delays, and the formula is as follows:
the pair of formula (6) is composed of S (k-Deltak) and S (k-Deltak)2) The composed mixed signal is processed to obtain a useful signal S (k). And demodulating S (k) to obtain the data sent by the signal source.
Claims (10)
1. A double receiving unit joint anti-interference method based on propagation delay difference is characterized in that the method comprises the following steps:
(1) the antennas of the receiving unit 1 and the receiving unit 2 receive useful signals and interference signals from a free space at the same time, and the signals received by the receiving unit 1 are A-path signals, and the signals received by the receiving unit 2 are B-path signals;
(2) down-converting the A path signal and the B path signal in the step (1) to a frequency band suitable for sampling;
(3) sampling the signals of the path A and the path B after the down-conversion in the step (2) by using the same clock, wherein the sampling interval is T seconds;
(4) comparing the time delay between the A path sampling signal and the B path sampling signal, and estimating an A path time delay adjusting value N1 and a B path time delay adjusting value N2;
(5) delaying the A path of sampling signals for N1 × T seconds, and delaying the B path of sampling signals for N2 × T seconds;
(6) performing combined processing on the A path of sampling signals and the B path of sampling signals delayed in the step (5), eliminating interference signals, and obtaining a mixed signal of useful signals in the step 3A path of sampling signals delayed for N1T seconds and useful signals in the step 3B path of sampling signals delayed for N2T seconds;
(7) processing the mixed signal in the step (6) to obtain a useful signal;
(8) and (4) demodulating the useful signal in the step (7) to obtain data.
2. The method for joint interference rejection of dual receiving units based on propagation delay differences as claimed in claim 1, wherein receiving unit 1 and receiving unit 2 are located at different spatial positions.
3. The dual-receiver unit joint interference rejection method based on propagation delay differences as claimed in claim 1, wherein the positions of the desired signal source and the interfering signal source do not overlap.
4. The joint interference avoidance method of dual receiving units based on propagation delay differences as claimed in claim 1, wherein the path a sampled signal in step (4) is a down-converted and sampled signal of the mixed signal received by the receiving unit 1 in step 1.
5. The joint interference rejection method for dual receiving units based on propagation delay differences as claimed in claim 1, wherein the B-path sampled signal in step (4) is a down-converted and sampled signal of the mixed signal received by the receiving unit 2 in step 1.
6. The joint interference avoidance method of dual receiving units based on propagation delay differences as claimed in claim 1, wherein the difference between the propagation delays of the interference signal received by the a-path and the interference signal received by the B-path is estimated approximately based on the delay between the sampling signal of the a-path and the sampling signal of the B-path in step (4).
7. The method for joint interference rejection of dual receiving units based on propagation delay differences as claimed in claim 1, wherein the values of N1 and N2 in step (4) are the number of samples.
8. The joint interference avoidance method of dual receiving units based on propagation delay differences as claimed in claim 1, wherein the propagation delay differences of the interference signals in the a-path signal and the B-path signal delayed in step (5) are approximately 0.
9. The joint interference rejection method for dual receiving units based on propagation delay differences as claimed in claim 1, wherein the mixed signal of step (5) contains 2 useful signals with different propagation delays.
10. The method of claim 1, wherein the antennas of the receiving unit 1 and the receiving unit 2 are installed at positions that ensure that the interference signals can be cancelled and the useful signals cannot be cancelled.
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