Anti-interference signal transceiving method

Abstract

The invention relates to an anti-interference signal transmitting and receiving method, belongs to the technical field of communication, and solves the problem of poor quality of received signals when the signals are transmitted and received at the same time and the same frequency in the prior art. The signal transmitting and receiving method comprises the following steps: acquiring a signal to be transmitted, transmitting the signal to be transmitted to the air through a first transmitting and receiving unit, and meanwhile, coupling an observation signal from the signal to be transmitted by the first transmitting and receiving unit; obtaining the observation signal from the first transceiver unit, and filtering the observation signal according to a preset first FIR filter to obtain a filtered observation signal; and obtaining an antenna signal from the second transceiver unit, and performing first interference cancellation on the antenna signal by using the observation signal after filtering processing to obtain a signal of interest. And high-quality receiving and transmitting of signals at the same time and at the same frequency are realized.

Description

Technical Field

[0001] The present invention relates to the field of communication technology, and in particular to an interference-resistant signal receiving and sending method. Background Art

[0002] With the advancement of electronic technology and the increase in demand, the traditional single-channel electromagnetic wave transceiver system has gradually developed towards multi-channel and array-based. At present, the types of mission systems configured on various electromagnetic transceiver platforms are gradually increasing, and the functions of electronic systems are becoming more and more, and the performance requirements are becoming higher and higher. Large-scale multiple-input multiple-output technology is one of the key technologies of the next generation of mobile communication systems, with advantages such as high energy efficiency, high spectrum efficiency and stable performance.

[0003] The signal transmission and reception methods in the prior art generally use resource management and scheduling methods to realize the integrated multifunctional array system in which each function is occupied in time, and transmission and reception need to work in time or frequency. When transmission and reception work at the same frequency at the same time, the transmission signal and its noise and nonlinear distortion interference will be coupled to the receiving channel through space, causing strong interference to the signal of interest that the receiving channel needs to receive, seriously affecting the signal quality obtained by the receiving channel.

[0004] And when the transmitting channel and the receiving channel are close, high-power interference will saturate the receiving channel. The saturation of the receiving path components will cause the receiving channel to fail to work normally or even be damaged, seriously affecting the signal quality obtained by the receiving channel.

[0005] Therefore, there is an urgent need for a technical solution for signal transmission and reception that is able to resist interference. Summary of the invention

[0006] In view of the above analysis, an embodiment of the present invention aims to provide an interference-resistant signal receiving and transmitting method to solve the problem of poor quality of received signals when signals are transmitted and received simultaneously and at the same frequency in the prior art.

[0007] An embodiment of the invention provides an anti-interference signal transceiving method, the signal transceiving method comprising:

[0008] Acquire a signal to be transmitted, and transmit the signal to be transmitted into the air through a first transceiver unit, and at the same time, the first transceiver unit couples an observation signal from the signal to be transmitted;

[0009] Acquire an observation signal from the first transceiver unit, and filter the observation signal according to a first FIR filter set in advance to obtain a filtered observation signal;

[0010] The antenna signal is obtained from the second transceiver unit, and the first interference cancellation is performed on the antenna signal using the observation signal after filtering to obtain a signal of interest.

[0011] Based on the further improvement of the above signal transceiving method, before using the filtered observation signal to perform the first interference cancellation on the antenna signal, the signal transceiving method further includes:

[0012] Acquire the signal to be transmitted, and filter the signal to be transmitted according to the second FIR filter set in advance to obtain a cancellation signal;

[0013] The cancellation signal is transmitted to the second transceiver unit; the antenna signal received in the second transceiver unit is subjected to second interference cancellation with the cancellation signal to obtain an antenna signal after second interference cancellation; wherein the antenna signal obtained from the second transceiver unit is the antenna signal after second interference cancellation.

[0014] Based on the further improvement of the above signal receiving and transmitting method, the first FIR filter coefficient is set by the following steps:

[0015] Transmitting the first training signal into the air through the first transceiver unit, and at the same time, the first transceiver unit couples a first observation training signal from the first training signal;

[0016] Acquire a first training signal received from the air in the second transceiver unit, and determine a channel response of a first FIR filter based on the first training signal, the first observed training signal, and the first training signal received from the air;

[0017] The first FIR filter coefficients are determined according to the channel response of the first FIR filter, the maximum number of taps, the baseband sampling rate and the frequency point value vector corresponding to the training comb spectrum signal.

[0018] Based on the further improvement of the above signal receiving and transmitting method, the second FIR filter coefficient is set by the following steps:

[0019] Transmitting the second training signal into the air through the first transceiver unit; and at the same time, acquiring the second training signal received from the air by the second transceiver unit as the second observed training signal;

[0020] The third training signal is transmitted to the second transceiver unit; meanwhile, the second transceiver unit couples a third observation training signal from the third training signal;

[0021] determining a channel response of a second FIR filter based on the second training signal, the third training signal, the second observed training signal, and the third observed training signal;

[0022] The coefficients of the second FIR filter are determined according to the channel response of the second FIR filter, the maximum number of taps, the baseband sampling rate and the frequency point value vector corresponding to the training comb spectrum signal.

[0023] Based on the further improvement of the above signal receiving and transmitting method, the first FIR filter coefficient or the second FIR filter coefficient is determined by the following formula:

[0024]

[0025] M=exp(-2πi·b T u / f s );

[0026] u=[-L / 2,-L / 2+1,...,L / 2-1];

[0027] Among them, L represents the maximum number of taps of the filter, u represents the tap vector, b represents the frequency point value vector corresponding to the training comb spectrum signal, and f s represents the baseband sampling rate, M represents the linear training matrix, H represents the channel response, V represents the filter coefficient, represents the second-order norm.

[0028] Based on the further improvement of the above signal receiving and transmitting method, after the first interference cancellation is performed on the antenna signal by using the filtered observation signal, the method further includes:

[0029] Acquire a signal to be transmitted, determine a third filter based on a least mean square method, and use the third filter to filter the signal to be transmitted to obtain an adaptive cancellation signal;

[0030] The antenna signal after the two interference cancellations is subjected to a third interference cancellation using an adaptive cancellation signal to obtain a signal of interest.

[0031] Based on the further improvement of the above signal transceiver method, the first transceiver unit and the second transceiver unit have the same structure, both including a first channel, a second channel, a switch network, a coupler and an antenna, the switch network, the coupler and the antenna are connected in sequence, and the first channel and the second channel are both connected to the switch network; the first channel is used to transmit signals to the switch network, and the second channel is used to receive signals from the switch network;

[0032] The first transceiver unit is a pre-set transceiver unit for transmitting signals into the air;

[0033] The second transceiver unit is a pre-set transceiver unit for receiving signals from the air.

[0034] Based on the further improvement of the above signal transceiver method, in the first transceiver unit, the first channel transmits the signal to be transmitted to the switch network, and the switch network transmits the signal to be transmitted to the coupler;

[0035] The coupler transmits the signal to be transmitted to the antenna, which then transmits it into the air;

[0036] At the same time, the coupler transmits the coupled signal of the signal to be transmitted as an observation signal to the switch network, and the switch network transmits the observation signal to the second channel.

[0037] Based on the further improvement of the above signal transceiver method, in the second transceiver unit, the signal to be transmitted of the first transceiver unit is filtered to output a cancellation signal, and the cancellation signal is transmitted to the switch network through the first channel, and the switch network transmits the cancellation signal to the coupler;

[0038] The antenna transmits the received antenna signal to the coupler; after the antenna signal and the cancellation signal are subjected to second interference cancellation in the coupler, the coupler outputs the antenna signal after the second interference cancellation to the switch network;

[0039] The switch network transmits the antenna signal after the second interference is cancelled to the second channel.

[0040] Based on the further improvement of the above signal transceiver method, the first channel includes a digital up-converter, a digital-to-analog converter, an adjustable amplifier and a transmission filter connected in sequence;

[0041] The digital up-converter is used to receive the signal to be transmitted or the cancellation signal; the signal to be transmitted or the cancellation signal passes through the digital-to-analog converter, the adjustable amplifier and the transmission filter in sequence; the transmission filter is connected to the switch network to output the signal to be transmitted or the cancellation signal to the switch network.

[0042] The second channel includes an adjustable gain and attenuator, a receiving filter, an analog-to-digital converter and a digital down-converter connected in sequence;

[0043] The adjustable gain and attenuator are connected to a switch network for receiving an observation signal or an antenna signal after interference cancellation from the switch network; the observation signal or the antenna signal after interference cancellation passes through a receiving filter, an analog-to-digital converter and a digital down converter in sequence; the digital down converter is used to transmit the observation signal or the antenna signal after interference cancellation.

[0044] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0045] 1. The observation signal is coupled out by the signal to be transmitted, and the observation signal is filtered by the first FIR filter set in advance. The filtered observation signal cancels the interference of the received antenna signal, thereby reducing the interference of the signal to be transmitted transmitted into the air on the received signal and improving the quality of the received signal of interest;

[0046] 2. The transmission signal is filtered by a second FIR filter set in advance to obtain a cancellation signal, and the cancellation signal is transmitted to the second transceiver unit. In the second transceiver unit, the cancellation signal and the received antenna signal are interfered with and cancelled, and then the observation signal after filtering is used to cancel the interference of the antenna signal received from the second transceiver unit. By performing two interference cancellations on the antenna signal received from the air, the interference caused by the signal to be transmitted into the air to the received signal is further reduced, and the quality of the finally received signal of interest is improved;

[0047] 3. After the antenna signal received from the air is subjected to two interference cancellations, an adaptive cancellation signal is obtained through a third filter determined based on the least mean square method. The adaptive cancellation signal is used to perform a third interference cancellation on the antenna signal after the two interference cancellations, thereby further improving the quality of the received signal of interest;

[0048] 4. The first transceiver unit and the second transceiver unit transmit and receive training signals to realize the setting of the first FIR filter and the second FIR filter, accurately reduce the interference of the received signal, and improve the quality of the received signal of interest.

[0049] In the present invention, the above-mentioned technical solutions can also be combined with each other to achieve more preferred combination solutions. Other features and advantages of the present invention will be described in the subsequent description, and some advantages can become obvious from the description, or can be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained through the contents particularly pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] The drawings are only for the purpose of illustrating particular embodiments and are not to be considered limiting of the present invention. Like reference symbols denote like components throughout the drawings.

[0051] Figure 1 A schematic diagram of a flow chart of an anti-interference signal receiving and sending method provided by an embodiment of the present invention;

[0052] Figure 2 A schematic diagram of the structure of an array transceiver system provided by an embodiment of the present invention;

[0053] Figure 3 A schematic structural diagram of a first transceiver unit and a second transceiver unit provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0054] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0055] A specific embodiment of the present invention discloses an anti-interference signal receiving and transmitting method, such as Figure 1 As shown, the signal receiving and sending method includes:

[0056] Step S1: obtaining a signal to be transmitted, transmitting the signal to be transmitted into the air through a first transceiver unit, and at the same time, the first transceiver unit couples an observation signal from the signal to be transmitted;

[0057] Step S2: acquiring an observation signal from the first transceiver unit, and filtering the observation signal according to a first FIR filter set in advance to obtain a filtered observation signal;

[0058] Step S3: Acquire the antenna signal from the second transceiver unit, and use the filtered observation signal to perform a first interference cancellation on the antenna signal to obtain a signal of interest.

[0059] Specifically, an anti-interference signal transceiver method provided by an embodiment of the present invention is executed by a control end, such as a digital processing unit. The digital processing unit is connected to a first transceiver unit and a second transceiver unit respectively, the first transceiver unit is a transceiver unit pre-set to transmit a signal to be transmitted in the digital processing unit into the air, and the second transceiver unit is a transceiver unit pre-set to receive a signal of interest from the air to the digital processing unit.

[0060] like Figure 1 As shown, in step S1, the signal to be transmitted is a signal that currently needs to be transmitted into the air. The signal to be transmitted is acquired and transmitted into the air through the first transceiver unit. The signal to be transmitted in the air will interfere with the signal received by the second transceiver unit, so that the quality of the signal of interest received by the second transceiver unit is not high.

[0061] Specifically, in step S1, while the first transceiver unit transmits the signal to be transmitted into the air, the coupler in the transceiver unit may couple the signal to be transmitted to obtain a coupled signal of the signal to be transmitted as an observation signal.

[0062] Specifically, Figure 1 As shown, in step S2, the digital processing unit obtains the observation signal from the first transceiver unit, that is, obtains the coupling signal of the signal to be transmitted, and filters the observation signal according to the first FIR filter set in advance to obtain the filtered observation signal.

[0063] Specifically, in step S3, the second transceiver unit receives the antenna signal from the air, the digital processing unit obtains the antenna signal received by the second transceiver unit, and uses the filtered observation signal obtained in step S2 to perform a first interference cancellation on the antenna signal. The first interference cancellation is a single interference cancellation. At this time, the antenna signal after the first interference cancellation is the signal of interest that the digital processing unit needs to receive through the second transceiver unit.

[0064] Specifically, an interference-resistant signal receiving and transmitting method provided by an embodiment of the present invention utilizes a signal to be transmitted to couple out an observation signal, and uses a first FIR filter set in advance to filter the observation signal. The filtered observation signal cancels out interference with a received antenna signal, thereby reducing the interference of the signal to be transmitted transmitted into the air on the received signal, and improving the quality of the received signal of interest.

[0065] It is worth noting that the first transceiver unit can not only transmit the signal to be transmitted in the digital processing unit into the air, but also transmit the observation signal in the first transceiver unit to the digital processing unit.

[0066] Preferably, the first FIR filter coefficients are set by the following steps:

[0067] Transmitting the first training signal into the air through the first transceiver unit, and at the same time, the first transceiver unit couples a first observation training signal from the first training signal;

[0068] Acquire a first training signal received from the air in the second transceiver unit, and determine a channel response of a first FIR filter based on the first training signal, the first observed training signal, and the first training signal received from the air;

[0069] The first FIR filter coefficients are determined according to the channel response of the first FIR filter, the maximum number of taps, the baseband sampling rate and the frequency point value vector corresponding to the training comb spectrum signal.

[0070] Specifically, when setting the first FIR filter coefficient, a first training signal is generated by the digital processing unit, and the first training signal is transmitted into the air by the first transceiver unit. At the same time, the first transceiver unit transmits the coupled signal of the first training signal, that is, the first observed training signal, to the digital processing unit.

[0071] Specifically, the first training signal in the air is received by the second transceiver unit, and the first training signal in the air is transmitted to the digital processing unit through the second transceiver unit. At this time, the first training signal obtained by the digital processing unit passes through the first transceiver unit, the air channel and the second transceiver unit in sequence and returns to the digital processing unit. It can be understood that when the same frequency signal is received while transmitting the signal, the signal transmitted into the air will interfere with the received signal, making the received signal quality poor.

[0072] Specifically, at this time, the digital processing unit determines the channel response of the first FIR filter based on the first training signal, the first observed training signal, and the first training signal received from the air.

[0073] Specifically, the signal response of the first FIR filter=the first training signal / the first observed training signal.

[0074] Preferably, the first FIR filter coefficient is determined by the following formula:

[0075]

[0076] M=exp(-2πi·b T u / f s );

[0077] u=[-L / 2,-L / 2+1,...,L / 2-1];

[0078] Where L represents the maximum number of taps of the first FIR filter, u represents the tap vector of the first FIR filter, b represents the frequency point value vector corresponding to the training comb spectrum signal of the first FIR filter, and f s represents the baseband sampling rate of the first FIR filter, M represents the linear training matrix of the first FIR filter, H represents the channel response of the first FIR filter, V represents the first FIR filter coefficient, represents the second-order norm.

[0079] Specifically, for the first FIR filter, its cancellation principle and coefficient calculation process are as follows:

[0080] When the signal to be transmitted transmitted by the digital processing unit passes through the first transceiver unit, an interference signal is generated. In addition to the linear distortion signal of the baseband, the interference signal also contains the nonlinear distortion signal generated by the transmitting device in the first transceiver unit. The generated linear distortion signal and nonlinear distortion signal are divided into two paths:

[0081] ① It enters the antenna all the way, is coupled to the second transceiver unit in the receiving working mode through the spatial channel, is received by the second transceiver unit, enters the digital processing unit, and is offset by the output end of the first FIR filter;

[0082] ② The other path enters the first transceiver unit as an observation signal and enters the input end of the first FIR filter in the digital processing unit.

[0083] 1. Through the training process, we can calculate the channel response required by the first FIR filter. The specific steps are: send the first training signal t from the first transceiver unit Tx , respectively receive training signals from the second transceiver unit and the first transceiver unit, and the first training signal received from the air is denoted as t Rx The first observed training signal is coupled out from the first training signal and is denoted as t Ob Then the channel response of the first FIR filter is H1 = t Rx / t Ob ;

[0084] 2. Calculate the filter coefficients corresponding to the first FIR filter: define L as the maximum number of taps of the filter. Construct vector u = [-L / 2, -L / 2+1, ..., L / 2-1], linear training matrix M = exp(-2πi·b T u / f s ), where f s is the baseband sampling rate, b is the frequency value vector corresponding to the training comb spectrum signal;

[0085] 3. Calculate the filter coefficient v1 by solving the following optimization problem, where ||x||2 represents the second-order norm of x:

[0086] 4. When the filter coefficient corresponding to the first FIR filter is set to the calculated value, when the signal passes through the first transceiver unit, the two signals separated by the coupling of the first transceiver unit can be offset at the digital processing unit of the second transceiver unit.

[0087] Preferably, before performing the first interference cancellation on the antenna signal using the filtered observation signal, the signal transceiving method further includes:

[0088] Acquire the signal to be transmitted, and filter the signal to be transmitted according to the second FIR filter set in advance to obtain a cancellation signal;

[0089] The cancellation signal is transmitted to the second transceiver unit; the antenna signal received in the second transceiver unit is subjected to a second interference cancellation with the cancellation signal to obtain an antenna signal after the second interference cancellation; wherein the antenna signal obtained from the second transceiver unit is the antenna signal after the second interference cancellation

[0090] Specifically, before using the filtered observation signal to perform the first interference cancellation on the antenna signal, the digital processing unit has obtained the filtered observation signal. At the same time, the digital processing unit also needs to obtain the cancellation signal according to the signal to be transmitted.

[0091] Specifically, in the digital processing unit, the signal to be transmitted is filtered by using the second FIR filter set in advance to obtain the signal to be transmitted after filtering as the cancellation signal, and the cancellation signal is transmitted to the second transceiver unit.

[0092] Specifically, the second transceiver unit receives the antenna signal from the air, and uses the cancellation signal to perform a second interference cancellation on the received antenna signal. For example, a coupler is set in the second transceiver unit, and the received antenna signal is cancelled by the coupling signal of the cancellation signal, and the antenna signal after the second interference cancellation is transmitted to the digital processing unit.

[0093] Specifically, the second transceiver unit transmits the antenna signal after the second interference cancellation to the digital processing unit, and the digital processing unit uses the filtered observation signal obtained in step S2 to perform the first interference cancellation on the antenna signal after the second interference cancellation to obtain the signal of interest.

[0094] It is worth noting that, in the antenna signal after the first interference cancellation and the second interference cancellation, the interference of the to-be-transmitted signal in the air on the reception of the signal of interest is further reduced, thereby improving the quality of the received signal.

[0095] Specifically, an interference-resistant signal receiving and transmitting method provided by an embodiment of the present invention filters a signal to be transmitted through a second FIR filter set in advance to obtain a cancellation signal, transmits the cancellation signal to a second transceiver unit, and cancels interference between the cancellation signal and the received antenna signal in the second transceiver unit, and then uses the filtered observation signal to cancel interference with the antenna signal received from the second transceiver unit. By performing two interference cancellations on the antenna signal received from the air, the interference caused by the signal to be transmitted transmitted into the air to the received signal is further reduced, thereby improving the quality of the finally received signal of interest.

[0096] Preferably, the second FIR filter coefficients are set by the following steps:

[0097] Transmitting the second training signal into the air through the first transceiver unit; and at the same time, acquiring the second training signal received from the air by the second transceiver unit as the second observed training signal;

[0098] The third training signal is transmitted to the second transceiver unit; meanwhile, the second transceiver unit couples a third observation training signal from the third training signal;

[0099] determining a channel response of a second FIR filter based on the second training signal, the third training signal, the second observed training signal, and the third observed training signal;

[0100] The coefficients of the second FIR filter are determined according to the channel response of the second FIR filter, the maximum number of taps, the baseband sampling rate and the frequency point value vector corresponding to the training comb spectrum signal.

[0101] Specifically, when setting the second FIR filter, the digital processing unit generates a second training signal, the second training signal is transmitted into the air through the first transceiver unit, received by the second transceiver unit through the air, and then transmitted to the digital processing unit.

[0102] Specifically, the digital processing unit generates a third training signal, passes the third training signal through the second transceiver unit, couples the third training signal in the second transceiver unit to obtain a third observation training signal, and the third observation training signal is transmitted back to the digital processing unit by the second transceiver unit.

[0103] Specifically, in the digital processing unit, the channel response of the second FIR filter is determined using the second training signal, the third training signal, the second observed training signal, and the third observed training signal.

[0104] Specifically, the channel response of the second FIR filter=(second observed training signal / second training signal) / (third observed training signal / third training signal).

[0105] Preferably, the second FIR filter coefficient is determined by the following formula:

[0106]

[0107] M=exp(-2πi·b T u / f s );

[0108] u=[-L / 2,-L / 2+1,...,L / 2-1];

[0109] Where L represents the maximum number of taps of the second FIR filter, u represents the tap vector of the second FIR filter, b represents the frequency point value vector corresponding to the training comb spectrum signal of the second FIR filter, and f s represents the baseband sampling rate of the second FIR filter, M represents the linear training matrix of the second FIR filter, H represents the channel response of the second FIR filter, V represents the coefficient of the second FIR filter, represents the second-order norm.

[0110] Specifically, for the second FIR filter, its cancellation principle and coefficient calculation process are as follows:

[0111] When the signal to be transmitted transmitted by the digital processing unit passes through the first transceiver unit, an interference signal is generated, enters the transmitting antenna, is coupled to the second transceiver unit through the spatial channel, and is received by the second transceiver unit.

[0112] Since the first transceiver unit and the second transceiver unit are close to each other and have high transmission power, the power of the interference signal received by the second transceiver unit may exceed the threshold, affecting the normal operation of the second transceiver unit. Therefore, the signal to be transmitted is introduced as a reference in the digital processing unit, and after passing through the second FIR filter, it is introduced by the second transceiver unit, and in the second transceiver unit, it cancels out the interference signal after spatial coupling.

[0113] 1. Through the training process, we can calculate the channel response required by the second FIR filter. The specific steps are: send the second training signal t from the first transceiver unit Tx , a third training signal t is transmitted from the second transceiver unit Dx , respectively receive the transmitted training signal from the second transceiver unit, and the second training signal received from the air in the second transceiver unit is denoted as t Rx1 The second transceiver unit couples the third observation training signal from the third training signal and records it as t Rx2 Then the channel response of the second FIR filter is H2 = (t Rx1 / t Tx ) / (t Rx2 / t Dx );

[0114] 2. Calculate the filter coefficients corresponding to the second FIR filter: define L as the maximum number of taps of the filter. Construct vector u = [-L / 2, -L / 2+1, ..., L / 2-1], linear training matrix M = exp(-2πi·b T u / f s ), where f s is the baseband sampling rate, b is the frequency value vector corresponding to the training comb spectrum signal;

[0115] 3. Calculate the filter coefficient v2 by solving the following optimization problem, where ||x||2 represents the second-order norm of x:

[0116] 4. When the filter coefficient corresponding to the second FIR filter is set to the calculated value, when the actual signal is transmitted through the first transceiver unit, the signal to be transmitted by the first transceiver unit can be offset in the coupler of the second transceiver unit, thereby avoiding the interference caused by the signal to be transmitted by the first transceiver unit to the signal received by the second transceiver unit.

[0117] Preferably, after performing a first interference cancellation on the antenna signal using the filtered observation signal, the method further comprises:

[0118] Acquire a signal to be transmitted, determine a third filter based on a least mean square method, and use the third filter to filter the signal to be transmitted to obtain an adaptive cancellation signal;

[0119] The antenna signal after the two interference cancellations is subjected to a third interference cancellation using an adaptive cancellation signal to obtain a signal of interest.

[0120] Specifically, in the second transceiver unit, a cancellation signal is used to perform a second interference cancellation on the antenna signal received from the air, and in the digital processing unit, a filtered observation signal is used to perform a first interference cancellation on the antenna signal after the second interference cancellation. At this time, the antenna signal received from the air undergoes two interference cancellations.

[0121] Specifically, the antenna signal that has undergone two interference cancellations is subjected to a third interference cancellation in a digital processing unit to obtain a signal of interest.

[0122] Specifically, in the digital processing unit, the third filter coefficient is determined based on the least mean square method using the signal to be transmitted, and the signal to be transmitted is filtered to obtain an adaptive cancellation signal; based on the adaptive cancellation signal, the antenna signal after two interference cancellations is subjected to a third interference cancellation to obtain a signal of interest.

[0123] It can be understood that the main principle of the third filter determined based on the least mean square method is to minimize the error between the output signal of the filter and the expected signal by adjusting the coefficients of the filter, so as to better cancel out the residual interference signal in the antenna signal after two cancellations and better extract the signal of interest.

[0124] It is worth mentioning that the first interference cancellation is mainly to eliminate the nonlinear, stray and other distorted interference signals introduced by nonlinear devices during the transmission period in the first transceiver unit; the second interference cancellation is mainly to reduce the power and amplitude of the signal to be transmitted in the air received by the second transceiver unit to prevent the second transceiver unit from being saturated or damaged due to excessive interference signals; the third interference cancellation is mainly to further eliminate the interference signals of the signal to be transmitted remaining after the first two interference cancellations, so that the signal of interest contains the least interference and obtains an accurate signal of interest.

[0125] Preferably, the first transceiver unit and the second transceiver unit have the same structure, and both include a first channel, a second channel, a switch network, a coupler and an antenna, the switch network, the coupler and the antenna are connected in sequence, and the first channel and the second channel are both connected to the switch network; the first channel is used to transmit signals to the switch network, and the second channel is used to receive signals from the switch network;

[0126] The first transceiver unit is a pre-set transceiver unit for transmitting signals into the air;

[0127] The second transceiver unit is a pre-set transceiver unit for receiving signals from the air.

[0128] Specifically, the anti-interference signal receiving and transmitting method is applicable to Figure 2 The array transceiver system shown in the figure may include multiple array modules, and the multiple array modules exchange data through their respective digital processing units. The distribution arrangement between the multiple array modules can be reasonably set according to actual conditions, such as Figure 2 The array transceiver system is composed of four array modules: array module 1, array module 2, array module 3 and array module 4.

[0129] Specifically, Figure 2 As shown, each array module includes a digital processing unit and multiple transceiver units with the same structure, and each transceiver unit includes a first channel, a second channel, a switch network, a coupler and an antenna. The first channel is used to upload the signal of the digital processing unit to the switch network, and then transmit it to the coupler through the switch network, and the signal in the coupler is transmitted to the digital processing unit through the switch network and the second channel.

[0130] Specifically, the digital processing unit is used to perform various signal transmission and reception processing on the signal, and is used to execute an anti-interference signal transmission and reception method provided by an embodiment of the present invention.

[0131] Specifically, the first transceiver unit is a transceiver unit pre-set for transmitting signals into the air; the second transceiver unit is a transceiver unit pre-set for receiving signals from the air.

[0132] Specifically, the transceiver unit has two working modes, namely, a transmitting working mode and a receiving working mode, that is, the transceiver unit can be set to a transmitting working mode or a receiving working mode. It is worth noting that each transceiver unit is set to either a transmitting working mode or a receiving working mode when working.

[0133] Specifically, when the transceiver unit is set to the receiving working mode through the switching network, it represents the first transceiver unit, and the transceiver unit will transmit the signal to be transmitted into the air through the antenna. The signal to be transmitted represents the signal that the digital processing unit needs to transmit into the air; when the transceiver unit is set to the receiving working mode through the switching network, it represents the second transceiver unit, and the transceiver unit receives the antenna signal in the air through the antenna and transmits it to the digital processing unit.

[0134] Specifically, Figure 3As shown, different transceiver units in a single array module can be set to a receiving working mode and a transmitting working mode respectively.

[0135] Preferably, in the first transceiver unit, the first channel transmits the signal to be transmitted to the switch network, and the switch network transmits the signal to be transmitted to the coupler;

[0136] The coupler transmits the signal to be transmitted to the antenna, which then transmits it into the air;

[0137] At the same time, the coupler transmits the coupled signal of the signal to be transmitted as an observation signal to the switch network, and the switch network transmits the observation signal to the second channel.

[0138] Specifically, when the first transceiver unit is working, the first channel receives the signal to be transmitted from the digital processing unit and transmits the signal to be transmitted to the switch network, and the switch network transmits the signal to be transmitted to the coupler;

[0139] The coupler transmits the signal to be transmitted to the antenna, and then transmits it;

[0140] At the same time, the coupler transmits the coupled signal of the signal to be transmitted as an observation signal to the switch network, the switch network transmits the observation signal to the second channel, and the second channel transmits the observation signal to the digital processing unit.

[0141] Specifically, Figure 3 As shown, when the working mode of the transceiver unit is set to the transmitting working mode, the first channel receives the signal to be transmitted from the digital processing unit, and transmits the signal to be transmitted to the switch network, and transmits the signal to be transmitted to the coupler through the setting of the switch network, and then transmits it. At the same time, in the coupler, the coupled signal of the signal to be transmitted is transmitted to the switch network as an observation signal through coupling, and the switch network transmits the observation signal to the second channel, and then transmits it to the digital processing unit.

[0142] Preferably, in the second transceiver unit, the signal to be transmitted of the first transceiver unit is filtered to output a cancellation signal, and the cancellation signal is transmitted to the switch network through the first channel, and the switch network transmits the cancellation signal to the coupler;

[0143] The antenna transmits the received antenna signal to the coupler; after the antenna signal and the cancellation signal are subjected to second interference cancellation in the coupler, the coupler outputs the antenna signal after the second interference cancellation to the switch network;

[0144] The switch network transmits the antenna signal after the second interference is cancelled to the second channel.

[0145] When the second transceiver unit is working, the digital processing unit filters the signals to be transmitted of other transceiver units to output a cancellation signal, and transmits the cancellation signal to the switch network through the first channel, and the switch network transmits the cancellation signal to the coupler;

[0146] The antenna transmits the received antenna signal to the coupler; after the antenna signal and the cancellation signal are interfered with each other in the coupler, the coupler outputs the interference-cancelled antenna signal to the switch network;

[0147] The switch network transmits the antenna signal after the interference cancellation to the second channel, and the second channel transmits the antenna signal after the interference cancellation to the digital processing unit;

[0148] The digital processing unit is used to filter the observation signal, and use the filtered observation signal to perform interference cancellation on the antenna signal after interference cancellation again to obtain the signal of interest.

[0149] Specifically, Figure 3 As shown, when the working mode of the transceiver unit is set to the receiving working mode, the digital processing unit filters the signals to be transmitted of other transceiver units, and transmits the filtered signals to be transmitted as cancellation signals to the switch network through the first channel, and the switch network transmits the cancellation signal to the coupler; in the coupler, the antenna signal received from the antenna is interfered with and canceled by the cancellation signal, which can reduce the nonlinear interference of the signals to be transmitted that have been transmitted into the air by other transceiver units to the received signal, and the coupler transmits the antenna signal after interference cancellation to the switch network, and the switch network transmits the canceled antenna signal to the digital processing unit through the second channel.

[0150] Specifically, when a certain transceiver unit in the array module is set to the receiving working mode, it is necessary to receive the signal of interest in the air. When receiving through the antenna, since the distance between the two transceiver units in the array module is relatively close, the transceiver unit in the transmitting working mode generates high-power interference to the transceiver unit in the receiving working mode, so that the second channel receiving device in the receiving working mode is saturated, which may cause the receiving device of the second channel to fail to work normally or even be damaged. In the present invention, the signal to be transmitted transmitted by the transceiver unit in the transmitting working mode is filtered, and the obtained cancellation signal is transmitted to the coupler through the first channel. The antenna signal received by the antenna is canceled through the coupling of the coupler, thereby avoiding the second channel of the receiving device of the transceiver unit in the receiving working mode from failing to work normally, resulting in poor signal reception or reception failure.

[0151] In the digital processing unit, the antenna signal after cancellation received by the transceiver unit in the receiving working mode needs to be cancelled again. It is worth noting that the coupled signal of the signal to be transmitted of other transceiver units is stored in the digital processing unit as an observation signal, and the interference cancellation is performed for other transceiver units in the receiving working mode. The digital processing unit filters the observation signal, and uses the observation signal after filtering to cancel the interference of the antenna signal after cancellation, so as to obtain the signal of interest.

[0152] It is worth noting that for the transceiver unit in the transmitting working mode, the signal to be transmitted will introduce additional noise and distortion signals through the first channel. When passing through the coupler, the coupled signal of the signal to be transmitted is introduced into the digital processing unit through the second channel as an observation signal. The observation signal is filtered in the digital processing unit, and the filtered observation signal is used to perform interference cancellation on the canceled antenna signal received by the transceiver unit in the receiving working mode, thereby obtaining the signal of interest.

[0153] It is worth noting that for the transceiver unit in the receiving working mode, it is necessary to perform interference cancellation on the received antenna signal twice. The first time, the received antenna signal is interfered with by the cancellation signal in the coupler, and the second time, the interference cancellation is performed on the antenna signal after the interference cancellation by using the observation signal after filtering in the digital processing unit, so as to obtain the signal of interest. By setting the first channel and the second channel in each transceiver unit, the first channel transmits the signal of the digital processing unit to the coupler, and the second channel transmits the signal of the coupler to the digital processing unit, it is achieved that in the array transceiver system, multiple transceiver units of each array module can work at the same frequency at the same time, thereby improving the efficiency of the array transceiver system when transmitting and receiving at the same time and the quality of the received signal.

[0154] Preferably, if Figure 3 As shown, the first channel includes a digital up-converter, a digital-to-analog converter, an adjustable amplifier and a transmit filter connected in sequence;

[0155] The digital up-converter is connected to the first transmission shaper or the second transmission shaper and is used to receive the signal to be transmitted or the cancellation signal;

[0156] The signal to be transmitted or the cancellation signal passes through the digital-to-analog converter, the adjustable amplifier and the transmission filter in sequence;

[0157] The transmitting filter is connected to the switch network and outputs the signal to be transmitted or the offset signal to the switch network.

[0158] Preferably, if Figure 3 As shown, the second channel includes an adjustable gain and attenuator, a receiving filter, an analog-to-digital converter and a digital down-converter connected in sequence;

[0159] The adjustable gain and attenuator are connected to the switch network and are used to receive the observation signal or the antenna signal after interference cancellation from the switch network;

[0160] The observation signal or the antenna signal after interference cancellation passes through the receiving filter, analog-to-digital converter and digital down converter in sequence;

[0161] The digital down converter is connected to the first receiving shaper and the second receiving shaper, and transmits the observation signal or the antenna signal after interference cancellation to the first receiving shaper and the second receiving shaper respectively.

[0162] Specifically, Figure 3 As shown, when the first transceiver unit is working, in the first channel, the digital up converter (Digital Up Converter, DUC) receives the signal to be transmitted from the first transmitting shaper, and the signal to be transmitted passes through the digital to analog converter (Digital to Analog Converter, DAC), the adjustable amplifier and the transmitting filter in sequence, and the transmitting filter transmits the signal to be transmitted to the switching network, and the switching network transmits the signal to be transmitted to the coupler. In the coupler, on the one hand, the signal to be transmitted is transmitted to the antenna for transmission. On the other hand, the coupled signal of the signal to be transmitted is transmitted to the second channel as an observation signal. In the second channel, the observation signal is received by using an adjustable gain and attenuator, and the observation signal passes through the receiving filter, the analog to digital converter (Analog to Digital Converter, ADC) and the digital down converter (Digital Down Converter, DDC) in sequence, and then transmitted to the first receiving shaper.

[0163] Specifically, Figure 3 When the second transceiver unit is working, the first channel uses DUC to receive the cancellation signal of the second transmit shaper. The cancellation signal passes through DAC, adjustable amplifier and transmit filter in sequence. The transmit filter transmits the cancellation signal to the coupler through the switch network. In the coupler, the cancellation signal is used to cancel the interference of the antenna signal connected to the coupler. The antenna signal after interference cancellation reaches the second channel through the switch network. In the second channel, it passes through the adjustable gain and attenuator, the receiving filter, ADC and DUC in sequence, and then connects to the second receiving shaper.

[0164] Preferably, if Figure 3 As shown, the coupler includes a first input and output port, a second input and output port, and a coupling port;

[0165] The first input / output port is connected to the antenna, the second input / output port is connected to the switch network, and the coupling port is connected to the switch network;

[0166] In the transmission working mode, the second input / output port receives the signal to be transmitted from the switch network, the signal to be transmitted is transmitted from the first input / output port to the antenna, and the observation signal is output from the coupling port to the switch network.

[0167] Specifically, Figure 3 As shown, the first input / output port is used to connect to the antenna, and is used to receive the antenna signal received by the antenna or send the signal to be transmitted to the antenna. The second input / output port and the coupling port are used to connect to the switch network. When the working mode of the transceiver unit is the transmitting working mode, the second input / output port is connected to the first channel, and the coupling port is connected to the second channel; when the working mode of the transceiver unit is the receiving working mode, the second input / output port is connected to the second channel, and the coupling port is connected to the first channel.

[0168] Preferably, in the receiving working mode, the coupling port receives the cancellation signal from the switch network, the first input-output port receives the antenna signal from the antenna, and the second input-output port outputs the antenna signal after interference cancellation to the switch network.

[0169] Preferably, in the transmitting working mode, the switch network connects the first channel to the second input-output port and simultaneously connects the second channel to the coupling port;

[0170] In the receiving operation mode, the switch network connects the first channel to the coupling port and connects the second channel to the second input-output port.

[0171] Specifically, when the transceiver unit is in the transmitting working mode, the second input and output port receives the signal to be transmitted from the first channel, and transmits the signal to be transmitted from the first input and output port to the antenna. At the same time, the coupled signal of the signal to be transmitted, that is, the observation signal, is transmitted to the second channel through the coupling port of the coupler, and the second channel transmits the observation signal to the digital processing unit, so that the digital processing unit can cancel the interference of the received signal when the transceiver unit is in the receiving working mode.

[0172] Specifically, when the transceiver unit is in the receiving working mode, the coupling port receives the cancellation signal from the first channel, and the cancellation signal in the coupler cancels the interference of the antenna signal received in the coupler. The antenna signal after interference cancellation is output from the second input and output port to the second channel. The second channel transmits the antenna signal after interference cancellation to the second receiving shaper and enters the digital processing unit. In the digital processing unit, the observation signal is used to cancel the interference of the antenna signal after interference cancellation again, so as to obtain the signal of interest.

[0173] Compared with the prior art, an interference-resistant signal receiving and transmitting method provided by an embodiment of the present invention utilizes a signal to be transmitted to couple out an observation signal, and uses a first FIR filter set in advance to filter the observation signal. The observation signal after filtering cancels the interference of the received antenna signal, thereby reducing the interference of the signal to be transmitted transmitted into the air on the received signal and improving the quality of the received signal of interest; and, the transmission signal is filtered by a second FIR filter set in advance to obtain a cancellation signal, and the cancellation signal is transmitted to a second transceiver unit, where the cancellation signal and the received antenna signal are interfered with and canceled, and then the observation signal after filtering is used to cancel the interference of the antenna signal received from the second transceiver unit. The antenna signal received from the air is subjected to two interference cancellations, which further reduces the interference of the to-be-transmitted signal transmitted into the air on the received signal, and improves the quality of the finally received signal of interest. At the same time, after the antenna signal received from the air is subjected to two interference cancellations, an adaptive cancellation signal is obtained by a third filter determined based on a least mean square method, and the adaptive cancellation signal is used to perform a third interference cancellation on the antenna signal after the two interference cancellations, which further improves the quality of the received signal of interest. The first transceiver unit and the second transceiver unit transmit and receive training signals to realize the setting of the first FIR filter and the second FIR filter, which accurately reduces the interference of the received signal and improves the quality of the received signal of interest.

[0174] Those skilled in the art will appreciate that all or part of the processes of the above-mentioned embodiments can be implemented by instructing related hardware through a computer program, and the program can be stored in a computer-readable storage medium, wherein the computer-readable storage medium is a disk, an optical disk, a read-only storage memory, or a random access memory, etc.

[0175] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A signal transceiver method for resisting interference, characterized in that: The signal transceiving method comprises: Acquire a signal to be transmitted, and transmit the signal to be transmitted into the air through a first transceiver unit, and at the same time, the first transceiver unit couples an observation signal from the signal to be transmitted; Acquire an observation signal from the first transceiver unit, and filter the observation signal according to a first FIR filter set in advance to obtain a filtered observation signal; The antenna signal is obtained from the second transceiver unit, and the first interference cancellation is performed on the antenna signal using the observation signal after filtering to obtain a signal of interest.

2. The signal transceiving method according to claim 1, characterized in that: Before performing a first interference cancellation on the antenna signal using the filtered observation signal, the signal transceiving method further includes: Acquire the signal to be transmitted, and filter the signal to be transmitted according to the second FIR filter set in advance to obtain a cancellation signal; The cancellation signal is transmitted to the second transceiver unit; the antenna signal received in the second transceiver unit is subjected to second interference cancellation with the cancellation signal to obtain an antenna signal after second interference cancellation; wherein the antenna signal obtained from the second transceiver unit is the antenna signal after second interference cancellation.

3. The signal transceiving method according to claim 1, characterized in that: Set the first FIR filter coefficients by following these steps: Transmitting the first training signal into the air through the first transceiver unit, and at the same time, the first transceiver unit couples a first observation training signal from the first training signal; Acquire a first training signal received from the air in the second transceiver unit, and determine a channel response of a first FIR filter based on the first training signal, the first observed training signal, and the first training signal received from the air; The first FIR filter coefficients are determined according to the channel response of the first FIR filter, the maximum number of taps, the baseband sampling rate and the frequency point value vector corresponding to the training comb spectrum signal.

4. The signal transceiving method according to claim 2, characterized in that: Set the second FIR filter coefficients by following these steps: Transmitting the second training signal into the air through the first transceiver unit; and at the same time, acquiring the second training signal received from the air by the second transceiver unit as the second observed training signal; The third training signal is transmitted to the second transceiver unit; meanwhile, the second transceiver unit couples a third observation training signal from the third training signal; determining a channel response of a second FIR filter based on the second training signal, the third training signal, the second observed training signal, and the third observed training signal; The coefficients of the second FIR filter are determined according to the channel response of the second FIR filter, the maximum number of taps, the baseband sampling rate and the frequency point value vector corresponding to the training comb spectrum signal.

5. The signal transceiving method according to claim 3 or 4, characterized in that: The first FIR filter coefficient or the second FIR filter coefficient is determined by the following formula: M=exp(-2πi·b T u / f s ); u=[-L / 2,-L / 2+1,…,L / 2-1]; Among them, L represents the maximum number of taps of the filter, u represents the tap vector, b represents the frequency point value vector corresponding to the training comb spectrum signal, and f S represents the baseband sampling rate, M represents the linear training matrix, H represents the channel response, V represents the filter coefficient, represents the second-order norm.

6. The signal transceiving method according to claim 2, characterized in that: After performing first interference cancellation on the antenna signal using the filtered observation signal, the method further includes: Acquire a signal to be transmitted, determine a third filter based on a least mean square method, and use the third filter to filter the signal to be transmitted to obtain an adaptive cancellation signal; The antenna signal after the two interference cancellations is subjected to a third interference cancellation using an adaptive cancellation signal to obtain a signal of interest.

7. The signal transceiving method according to claim 2, characterized in that: The first transceiver unit and the second transceiver unit have the same structure, and both include a first channel, a second channel, a switch network, a coupler, and an antenna. The switch network, the coupler, and the antenna are connected in sequence, and the first channel and the second channel are both connected to the switch network; the first channel is used to transmit signals to the switch network, and the second channel is used to receive signals from the switch network; The first transceiver unit is a pre-set transceiver unit for transmitting signals into the air; The second transceiver unit is a pre-set transceiver unit for receiving signals from the air.

8. The signal transceiving method according to claim 7, characterized in that: In the first transceiver unit, the first channel transmits the signal to be transmitted to the switch network, and the switch network transmits the signal to be transmitted to the coupler; The coupler transmits the signal to be transmitted to the antenna, which then transmits it into the air; At the same time, the coupler transmits the coupled signal of the signal to be transmitted as an observation signal to the switch network, and the switch network transmits the observation signal to the second channel.

9. The signal transceiving method according to claim 8, characterized in that: In the second transceiver unit, the signal to be transmitted of the first transceiver unit is filtered to output a cancellation signal, and the cancellation signal is transmitted to the switch network through the first channel, and the switch network transmits the cancellation signal to the coupler; The antenna transmits the received antenna signal to the coupler; after the antenna signal and the cancellation signal are subjected to second interference cancellation in the coupler, the coupler outputs the antenna signal after the second interference cancellation to the switch network; The switch network transmits the antenna signal after the second interference is cancelled to the second channel.

10. The signal transceiving method according to claim 9, characterized in that: The first channel includes a digital up-converter, a digital-to-analog converter, an adjustable amplifier and a transmit filter connected in sequence; The digital up-converter is used to receive the signal to be transmitted or the cancellation signal; the signal to be transmitted or the cancellation signal passes through the digital-to-analog converter, the adjustable amplifier and the transmission filter in sequence; the transmission filter is connected to the switch network to output the signal to be transmitted or the cancellation signal to the switch network. The second channel includes an adjustable gain and attenuator, a receiving filter, an analog-to-digital converter and a digital down-converter connected in sequence; The adjustable gain and attenuator are connected to a switch network for receiving an observation signal or an antenna signal after interference cancellation from the switch network; the observation signal or the antenna signal after interference cancellation passes through a receiving filter, an analog-to-digital converter and a digital down converter in sequence; the digital down converter is used to transmit the observation signal or the antenna signal after interference cancellation.

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