CN115473543A - Same-frequency self-interference elimination device and method suitable for independent transmit-receive antenna architecture - Google Patents
Same-frequency self-interference elimination device and method suitable for independent transmit-receive antenna architecture Download PDFInfo
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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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- H04B1/52—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa
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Abstract
The invention relates to a same-frequency self-interference elimination device and method suitable for an independent transceiving antenna framework, which comprises a self-interference signal reconstruction unit and a self-interference elimination unit, wherein a radio-frequency signal output by a transmitter is divided into two paths, one path is sent to a communication transmitting antenna for external transmission, and the other path is sent to the self-interference signal reconstruction unit; the self-interference signal reconstruction unit adopts a group of self-interference reconstruction transceiving antennas to generate a same-frequency interference signal sample and transmits the same-frequency interference signal sample to the self-interference elimination unit; the self-interference elimination unit generates a cancellation signal with the same amplitude and opposite phase with the self-interference signal by using the received same-frequency interference signal sample, so as to realize the interference elimination of the self-interference signal; according to the invention, the self-interference signal sample contains both the linear self-interference component and the passive intermodulation self-interference component caused by the antenna, so that the two self-interference signals can be simultaneously offset by using the inverted offset signal generated by the sample signal, and the cancellation performance is improved.
Description
Technical Field
The invention relates to a same-frequency self-interference elimination device and method suitable for an independent transmitting and receiving antenna framework, and belongs to the technical field of wireless communication.
Background
Currently, a common wireless duplex communication mode sometimes includes time division duplex and frequency division duplex, where the time division duplex is to transmit uplink data and downlink data at different time intervals, and the frequency division duplex is to transmit uplink data and downlink data by using different wireless frequency bands. Obviously, if a simultaneous co-frequency mode is used for full duplex transmission, the frequency spectrum utilization rate can be multiplied theoretically, and the simultaneous co-frequency full duplex technology has a very good application prospect because the current wireless communication frequency spectrum resources are increasingly tensed. The difficulty in realizing the co-frequency full duplex technology is that strong co-frequency interference is caused to a receiving end of the co-frequency full duplex technology when a signal is transmitted, so that a remote co-frequency useful signal is submerged and cannot be effectively received. Therefore, the premise of simultaneous same-frequency full duplex implementation is also that the core difficulty is the elimination of same-frequency self-interference.
For an independent transceiving antenna architecture, if co-frequency interference cancellation is to be achieved, an existing method is to divide a signal before entering a transmitting antenna into two paths, one path is sent to the transmitting antenna for transmission, the other path is subjected to amplitude phase adjustment through a specific circuit to generate a cancellation signal which has the same amplitude and opposite phase with a co-frequency self-interference signal coupled to a receiving antenna, and the cancellation signal and the co-frequency self-interference signal received by the antenna are added to achieve the co-frequency self-interference cancellation. In the method, a part of signals sent to a transmitting antenna is coupled out to be used as sample signals, and the following problems exist: the actual antenna is not an ideal linear device due to factors such as the manufacturing process, and in a high-power system, the nonlinear factor of the antenna can cause the generation of higher harmonics, namely, passive intermodulation components. Which in turn causes the self-interference signal to which the own receive antenna is coupled to also contain these passive intermodulation products. In the traditional scheme, a sample signal for constructing the anti-phase cancellation signal is obtained before a transmitting antenna and does not contain the passive intermodulation components, so that the method cannot effectively deal with the non-linear self-interference components caused by the passive intermodulation of the antenna.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a same-frequency self-interference elimination device and method suitable for an independent transceiving antenna framework.
The above purpose of the invention is mainly realized by the following technical scheme:
a same-frequency self-interference elimination device suitable for an independent transceiving antenna framework comprises a receiver, a transmitter, a communication transmitting antenna and a communication receiving antenna, and comprises a self-interference signal reconstruction unit and a self-interference elimination unit;
the radio frequency signal output by the transmitter is divided into two paths, one path is sent to a communication transmitting antenna for external transmission, and the other path is sent to a self-interference signal reconstruction unit;
the self-interference signal reconstruction unit receives the radio frequency signal, generates a same-frequency interference signal sample by adopting a group of self-interference reconstruction transceiving antennas and transmits the same-frequency interference signal sample to the self-interference elimination unit;
and the self-interference elimination unit receives the radio-frequency signal transmitted by the communication transmitting antenna through the communication receiving antenna, generates a cancellation signal with the same amplitude and opposite phase with the self-interference signal by using the received same-frequency interference signal sample as the self-interference signal, realizes the interference elimination of the self-interference signal, and sends the useful signal after the interference elimination to the receiver.
In the above apparatus for eliminating co-channel self-interference applicable to an independent transmit-receive antenna architecture, the set of self-interference reconstruction transmit-receive antennas included in the self-interference signal reconstruction unit are a self-interference reconstruction transmit antenna and a self-interference reconstruction receive antenna, another path of radio frequency signal output by the transmitter is transmitted to the self-interference reconstruction transmit antenna, and the radio frequency signal transmitted by the self-interference reconstruction transmit antenna is coupled to the self-interference reconstruction receive antenna in an environment without electromagnetic interference and is transmitted to the self-interference elimination unit as a sample of co-channel interference signal.
In the above-mentioned same-frequency self-interference cancellation device suitable for the independent transceiving antenna architecture, the self-interference signal reconstruction unit further includes a microwave dark box, the self-interference reconstruction transmitting antenna and the self-interference reconstruction receiving antenna are installed in the microwave dark box, the microwave dark box shields external electromagnetic waves, and does not reflect electromagnetic waves inside.
In the above apparatus for eliminating same-frequency self-interference applicable to an independent transceiving antenna architecture, the self-interference signal reconstructing unit further includes a power divider, and the radio frequency signal output by the transmitter is respectively transmitted to the communication transmitting antenna and the self-interference reconstructing transmitting antenna through two output ends of the power divider.
In the same-frequency self-interference elimination apparatus suitable for the independent transceiving antenna architecture, the radio frequency signal output by the transmitter is divided into two paths of same signals, one path of same signals is sent to the communication transmitting antenna for external transmission, and the other path of same signals is sent to the self-interference signal reconstruction unit.
In the same-frequency self-interference elimination apparatus suitable for the independent transceiving antenna architecture, the performance parameters of the self-interference reconstruction transmitting antenna and the communication transmitting antenna are consistent, and the performance parameters of the self-interference reconstruction receiving antenna and the communication receiving antenna are consistent.
In the same-frequency self-interference elimination apparatus suitable for the independent transceiving antenna architecture, the self-interference elimination unit includes an amplitude phase adjustment unit, a combiner, a coupler and a feedback control unit; wherein:
the amplitude and phase adjusting unit is used for receiving the amplitude adjusting parameter and the phase adjusting parameter sent by the feedback control unit, carrying out amplitude and phase adjustment on the co-frequency interference signal sample received from the self-interference signal reconstructing unit according to the amplitude adjusting parameter and the phase adjusting parameter, generating a cancellation signal which has the same amplitude and opposite phase with the self-interference signal received by the communication receiving antenna, and sending the cancellation signal to the synthesizer;
The synthesizer adds a self-interference signal received from the communication receiving antenna and a cancellation signal received from the amplitude phase adjusting unit, and the same-frequency interference signal is cancelled in an inverted mode to obtain a useful signal after interference elimination and send the useful signal to the coupler;
a coupler for outputting the useful signals received from the synthesizer to the receiver and the feedback control unit, respectively;
and the feedback control unit receives the useful signal from the coupler, generates an amplitude adjusting parameter and a phase adjusting parameter and sends the amplitude adjusting parameter and the phase adjusting parameter to the amplitude phase adjusting unit.
A method for eliminating same-frequency self-interference suitable for an independent transceiving antenna architecture comprises the following steps:
the radio frequency signal output by the transmitter is divided into two paths, one path is sent to a communication transmitting antenna for external transmission, and the other path is sent to a self-interference signal reconstruction unit;
the self-interference signal reconstruction unit receives the radio frequency signal, and a group of self-interference reconstruction transceiving antennas are adopted to generate co-frequency interference signal samples which are transmitted to the self-interference elimination unit;
the communication receiving antenna receives radio frequency signals transmitted by the communication transmitting antenna to the outside and sends the radio frequency signals to the self-interference elimination unit;
the self-interference elimination unit takes the radio-frequency signal received by the communication receiving antenna as a self-interference signal, utilizes the same-frequency interference signal sample received from the self-interference signal reconstruction unit to generate a cancellation signal with the same amplitude and opposite phase with the self-interference signal, realizes the interference elimination of the self-interference signal, and sends the useful signal after the interference elimination to the receiver.
In the method for eliminating same-frequency self-interference applicable to the independent transceiving antenna architecture, the self-interference signal reconstruction unit comprises a self-interference reconstruction transmitting antenna, a self-interference reconstruction receiving antenna, a power divider and a microwave dark box, and the self-interference reconstruction transmitting antenna and the self-interference reconstruction receiving antenna are installed in the microwave dark box;
the radio frequency signal output by the transmitter is respectively transmitted to the communication transmitting antenna and the self-interference reconstruction transmitting antenna through two output ends of the power divider, the radio frequency signal transmitted by the self-interference reconstruction transmitting antenna is coupled to the self-interference reconstruction receiving antenna in an environment without electromagnetic interference in a microwave dark box, and the radio frequency signal is used as a same-frequency interference signal sample and is transmitted to the self-interference elimination unit by the self-interference reconstruction receiving antenna.
In the same-frequency self-interference elimination method applicable to the independent transceiving antenna architecture, the self-interference elimination unit comprises an amplitude phase adjustment unit, a combiner, a coupler and a feedback control unit; wherein:
the amplitude phase adjustment unit receives the amplitude adjustment parameter and the phase adjustment parameter sent by the feedback control unit, performs amplitude and phase adjustment on the co-frequency interference signal sample received from the self-interference signal reconstruction unit according to the amplitude adjustment parameter and the phase adjustment parameter, generates a cancellation signal which has the same amplitude and opposite phase with the self-interference signal received by the communication receiving antenna, and sends the cancellation signal to the synthesizer;
The synthesizer adds a self-interference signal received from the communication receiving antenna and a cancellation signal received from the amplitude phase adjusting unit, the same-frequency interference signal is cancelled in an inverted mode, and a useful signal after interference elimination is obtained and sent to the coupler;
the coupler respectively outputs the useful signals received from the synthesizer to the receiver and the feedback control unit;
the feedback control unit receives the useful signal from the coupler and sends the generated amplitude adjustment parameter and phase adjustment parameter to the amplitude phase adjustment unit.
An independent receiving and transmitting antenna system comprises a receiver, a transmitter, a communication transmitting antenna, a communication receiving antenna and the same-frequency self-interference elimination device.
Compared with the prior art, the invention at least comprises the following beneficial effects:
(1) The same-frequency self-interference elimination device is suitable for the independent transceiving antenna framework, a group of independent self-interference reconstruction transceiving antennas are adopted to generate same-frequency interference signal samples, the parameters of the self-interference reconstruction transceiving antennas are consistent with the performance parameters of the communication transceiving antennas, the self-interference signal samples contain self-interference signals which are coupled with the communication receiving antennas and have the same frequency components, linear self-interference components are contained, and passive intermodulation self-interference components caused by the antennas are also contained, so that reverse phase offset signals generated by the sample signals can be used for offsetting the two self-interference signals at the same time, and the elimination performance is improved.
(2) The preferred self-interference elimination unit of the invention comprises a closed loop formed by an amplitude phase adjustment unit, a combiner, a coupler and a feedback control unit, and the best interference elimination effect can be realized by continuously adjusting the amplitude and the phase of a signal.
Drawings
FIG. 1 is a schematic structural diagram of a same-frequency self-interference cancellation apparatus suitable for an independent transceiving antenna architecture according to the present invention;
wherein: 100-self-interference signal reconstruction unit, 101-power divider, 102-microwave dark box, 103-self-interference reconstruction transmitting antenna, 104-self-interference reconstruction receiving antenna, 200-self-interference elimination unit, 201-amplitude phase adjustment unit, 202-combiner, 203-coupler, 204-feedback control unit, 301-communication transmitting antenna, 302-communication receiving antenna;
fig. 2 is a schematic diagram of simulation results of a same-frequency self-interference cancellation apparatus suitable for an independent transmit-receive antenna architecture according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the following figures and specific examples:
fig. 1 is a schematic structural diagram of a same-frequency self-interference cancellation apparatus suitable for an independent transceiving antenna architecture according to the present invention; the invention realizes the elimination of same frequency interference on the basis of an independent transceiving antenna architecture.
As shown in fig. 1, the single antenna transceiving architecture based on the circulator includes: a transmitter, a communication transmitting antenna 301, a communication receiving antenna 302, and a receiver; the invention is suitable for the same frequency self-interference eliminating device of the independent receiving and dispatching antenna framework, comprising: a self-interference signal reconstruction unit 100 and a self-interference cancellation unit 200;
the self-interference signal reconstruction unit 100 includes: the system comprises a power divider 101, a microwave dark box 102, a self-interference reconstruction transmitting antenna 103 and a self-interference reconstruction receiving antenna 104; the self-interference reconstruction transmitting antenna 103 and the self-interference reconstruction receiving antenna 104 are installed in the microwave dark box 102, the microwave dark box 102 shields the outside electromagnetic wave, and the inside does not reflect the electromagnetic wave.
The self-interference signal reconstruction unit 100 receives a radio frequency signal, generates co-channel interference signal samples by using a set of self-interference reconstruction transmit-receive antennas, and transmits the co-channel interference signal samples to the self-interference cancellation unit 200. The self-interference reconstruction receiving antenna 104 is connected to an input terminal of the amplitude and phase adjustment unit 201 in the self-interference cancellation unit 200. The radio frequency signal transmitted by the self-interference reconstruction transmitting antenna 103 is coupled to the self-interference reconstruction receiving antenna 104 in an environment where there is no electromagnetic wave interference, and is transmitted to the self-interference cancellation unit as a co-channel interference signal sample. The rf signal output by the transmitter is respectively transmitted to the communication transmitting antenna 301 and the self-interference reconstruction transmitting antenna 103 through two output terminals of the power divider 101.
The transmitter is connected to the input end of the power divider 101, and two output ends of the power divider 101 are respectively connected to the communication transmitting antenna 301 and the self-interference reconstruction transmitting antenna 103. The radio frequency signal output by the transmitter is divided into two paths of same signals, one path of same signals is sent to the communication transmitting antenna 301 for external transmission, and the other path of same signals is sent to the self-interference signal reconstruction unit 100.
The self-interference reconstruction transmitting antenna 103 and the communication transmitting antenna 301 have the same performance parameters, and the self-interference reconstruction receiving antenna 104 and the communication receiving antenna 302 have the same performance parameters.
As shown in fig. 1, the self-interference cancellation unit 200 includes: amplitude phase adjustment section 201, combiner 202, coupler 203, and feedback control section 204.
The amplitude phase adjustment unit 201 is configured to adjust an amplitude phase of the self-interference sample signal, and generate a cancellation signal with an equal amplitude and an opposite phase to the self-interference signal coupled to the communication receiving antenna 302;
the combiner 202 has two inputs and one output. Two input ends are respectively connected with the output end of the amplitude phase adjusting unit 201 and the communication receiving antenna 302, and the output end is connected with the coupler 203.
The combiner 202 adds the mixed signal containing the far-end useful signal and the co-channel self-interference signal from the communication receiving antenna 302 to the anti-phase cancellation signal from the amplitude and phase adjusting unit 201, and the co-channel interference signal is anti-phase cancelled, so as to obtain the useful signal output after the interference cancellation.
The output end of the feedback control unit 204 in the self-interference cancellation unit 200 is connected to the control input end of the self-interference cancellation unit 200, and the feedback control unit 204 performs feedback control on the amplitude and phase adjustment unit 201 by detecting the signal power output by the coupler 203, so as to adjust the amplitude and phase of the cancellation signal in real time, thereby achieving the best cancellation performance.
Specifically, the functions of each unit in the self-interference cancellation unit 200 are as follows:
the amplitude and phase adjustment unit 201 receives the amplitude adjustment parameter and the phase adjustment parameter sent by the feedback control unit 204, performs amplitude and phase adjustment on the co-frequency interference signal sample received from the self-interference signal reconstruction unit 100 according to the amplitude adjustment parameter and the phase adjustment parameter, generates a cancellation signal with the same amplitude and opposite phase as the self-interference signal received by the communication receiving antenna 302, and sends the cancellation signal to the synthesizer 202.
The coupler 203 outputs the desired signals received from the synthesizer 202 to the receiver and feedback control unit 204, respectively.
The feedback control unit 204 generates an amplitude adjustment parameter and a phase adjustment parameter from the useful signal received by the coupler 203, and sends the amplitude adjustment parameter and the phase adjustment parameter to the amplitude and phase adjustment unit 201.
The feedback control unit 204 receives the signal y (t), and detects the voltage value of y (t) by the detector circuit. The initial values of the amplitude adjustment parameter and the phase adjustment parameter are set values, the feedback control unit 204 adjusts the amplitude adjustment parameter and the phase adjustment parameter according to the set step values and then sends the adjusted values to the amplitude and phase adjustment unit 201, and in the data cycle sending process, if the useful signal y (t) received by the feedback control unit 204 from the coupler 203 again is smaller than the useful signal y (t) received last time, the step adjustment strategy is correct, and the amplitude adjustment parameter and the phase adjustment parameter are continuously adjusted according to the step value last time. Otherwise, if the useful signal y (t) received again by the feedback control unit 204 from the coupler 203 is greater than or equal to the useful signal y (t) received last time, the step adjustment strategy is changed, and a reverse direction change (for example, an original increase and a current decrease) is performed according to the set step value, and the final goal is to find the minimum y (t).
As shown in fig. 1, a transmission signal X (t) output from a transmitter is divided into two identical signals X (t) and X ' (t) by a power divider 101, where X (t) = X ' (t), X (t) is input to a communication transmitting antenna 301 for transmission, and X ' (t) is input to an interference self-interference signal reconstruction unit 100 for generating a co-channel interference sample signal;
the output signal r (t) of the communication receiving antenna 302 is represented by equation (1):
r(t)＝a 0 x(t-Δt 0 )+b 0 w(t)+u(t) (1)
wherein, a 0 x(t-Δt 0 ) The same-frequency self-interference signal from the communication transmitting antenna 301 coupled to the communication receiving antenna 302 belongs to the same groupLinear components of the frequency self-interference signal only have different amplitudes and phases; w (t) is a passive intermodulation component generated after a transmitting signal passes through a communication transmitting antenna, and belongs to a nonlinear component of a same-frequency self-interference signal; u (t) is a useful signal received by the communication receiving antenna 302 from other wireless devices;
the parameters of the self-interference reconstruction transmitting antenna 103 are consistent with the performance parameters of the communication transmitting antenna 301, the parameters of the self-interference reconstruction receiving antenna 104 are consistent with the performance parameters of the communication receiving antenna 302, and the self-interference reconstruction transmitting antenna 103 and the self-interference reconstruction receiving antenna 104 are both installed in the microwave dark box 102, and do not receive external electromagnetic signals, and there is no electromagnetic reflection inside the microwave dark box, so that the signal r' (t) output from the self-interference reconstruction receiving antenna 104 of the self-interference signal reconstruction unit 100 only contains the same-frequency self-interference signal components, including linear components and non-linear components, as shown in formula (2):
r'(t)＝a 1 x'(t-Δt 1 )+b 1 w(t) (2)
R' (t) is used as a reference signal, and is input into the self-interference cancellation unit 200, and amplitude phase adjustment is performed by an amplitude phase adjustment unit 201 of the self-interference cancellation unit 200, so as to obtain a cancellation signal c (t) with the same amplitude and opposite phase as the same-frequency self-interference signal, where c (t) is as shown in formula (3):
c(t)＝-[a 0 x(t-Δt 0 )+b 0 w(t)] (3)
through the addition and cancellation of the combiner 202, a signal y (t) with the co-channel interference signal eliminated is finally obtained, as shown in formula (4):
y(t)＝r(t)+c(t)＝u(t) (4)
the feedback control unit 204 detects the power value of the y (t) signal through the coupler 203, and adjusts the amplitude phase adjustment unit 201 of the self-interference cancellation unit 200 in real time to achieve the best cancellation effect.
The invention is suitable for the same frequency self-interference elimination method of the independent receiving and transmitting antenna framework, comprising the following steps:
1. the radio frequency signal output by the transmitter is divided into two paths, one path is sent to the communication transmitting antenna 301 for external transmission, and the other path is sent to the self-interference signal reconstruction unit;
2. the self-interference signal reconstruction unit 100 receives the radio frequency signal, generates a co-frequency interference signal sample by adopting a group of self-interference reconstruction transceiving antennas, and transmits the co-frequency interference signal sample to the self-interference elimination unit 200;
3. the communication receiving antenna 302 receives the radio frequency signal transmitted by the communication transmitting antenna 301 to the outside, and sends the radio frequency signal to the self-interference cancellation unit 200;
4. The self-interference cancellation unit 200 uses the radio frequency signal received through the communication receiving antenna 302 as a self-interference signal, generates a cancellation signal with the same amplitude and opposite phase as the self-interference signal by using the co-channel interference signal sample received from the self-interference signal reconstruction unit 100, cancels the interference of the self-interference signal, and sends the useful signal with the interference cancelled to the receiver.
The invention provides an independent transceiving antenna system, which comprises a receiver, a transmitter, a communication transmitting antenna 301, a communication receiving antenna 302 and the same-frequency self-interference elimination device.
The invention provides a same-frequency self-interference elimination device suitable for an independent transmitting and receiving antenna framework. There are two self-interference reconstruction antennas, which are named as: self-interference reconstruction transmitting antenna and self-interference reconstruction receiving antenna. The external transmitting and receiving antenna for communication is named as: communication transmitting antenna, communication receiving antenna. And the parameters of the self-interference reconstruction transceiving antenna are completely consistent with the performance parameters of the communication transceiving antenna. The self-interference reconstruction antenna is arranged in the microwave dark box, does not receive electromagnetic waves in an external space, does not reflect in the microwave dark box, and signals transmitted by the self-interference reconstruction transmitting antenna are transmitted and coupled to the self-interference reconstruction receiving antenna through the space in the microwave dark box. The radio frequency signal output by the transmitter is divided into two paths by the power divider, one path is sent to the communication transmitting antenna for external transmission, and the other path is sent to the self-interference reconstruction transmitting antenna of the self-interference signal reconstruction unit. Because the self-interference reconstruction antenna is consistent with the performance parameters of the external communication transceiving antenna, a sample signal containing the same passive intermodulation component as that output by the external communication transmitting antenna is generated. After the sample signal passes through the self-interference cancellation unit, a cancellation signal with the same amplitude and opposite phase with the self-interference signal coupled to the communication receiving antenna is generated, and the self-interference signal is cancelled in opposite phase after combining and adding.
Example 1
A simulation model is built under an ADS radio frequency simulation environment, the frequency point of a transmitting signal X (t) of a transmitter is 1.5G, a 16QAM modulation mode is adopted, and simulation is carried out, the frequency spectrum of a co-frequency interference signal is shown in figure 2 before and after the co-frequency self-interference elimination device suitable for an independent transceiving antenna framework is accessed, when the co-frequency self-interference elimination device suitable for the independent transceiving antenna framework is not accessed, the power of the co-frequency interference signal received by a receiver is about 7.2dBm, and after the co-frequency self-interference elimination device suitable for the independent transceiving antenna framework is accessed, the power of the co-frequency interference signal received by the receiver is reduced to-71.879 dBm, and the co-frequency self-interference elimination capability of about 79dB is realized.
The above description is only for the best mode of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Those skilled in the art will appreciate that the invention may be practiced without these specific details.
Claims (11)
1. A co-channel self-interference cancellation device adapted to an independent transceiving antenna architecture, the independent transceiving antenna architecture comprising a receiver, a transmitter, a communication transmit antenna (301) and a communication receive antenna (302), characterised in that the co-channel self-interference cancellation device comprises a self-interference signal reconstruction unit (100) and a self-interference cancellation unit (200);
The radio frequency signal output by the transmitter is divided into two paths, one path is sent to a communication transmitting antenna (301) for external transmission, and the other path is sent to a self-interference signal reconstruction unit (100);
the self-interference signal reconstruction unit (100) receives the radio frequency signal, generates co-channel interference signal samples by adopting a group of self-interference reconstruction transmitting and receiving antennas and transmits the co-channel interference signal samples to the self-interference elimination unit (200);
and the self-interference elimination unit (200) receives the radio frequency signal transmitted by the communication transmitting antenna (301) through the communication receiving antenna (302) to serve as a self-interference signal, generates a cancellation signal with the same amplitude and opposite phase with the self-interference signal by using the received co-frequency interference signal sample, realizes the interference elimination of the self-interference signal, and sends the useful signal after the interference elimination to a receiver.
2. The apparatus for eliminating co-channel self-interference applicable to independent transceiving antenna architecture according to claim 1, wherein the self-interference signal reconstruction unit (100) comprises a set of self-interference reconstruction transceiving antennas, which are a self-interference reconstruction transmitting antenna (103) and a self-interference reconstruction receiving antenna (104), and the other path of radio frequency signal output by the transmitter is transmitted to the self-interference reconstruction transmitting antenna (103), and the radio frequency signal transmitted by the self-interference reconstruction transmitting antenna (103) is coupled to the self-interference reconstruction receiving antenna (104) in an environment without electromagnetic wave interference, and is transmitted to the self-interference cancellation unit as a co-channel interference signal sample.
3. The same-frequency self-interference cancellation device suitable for independent transceiving antenna architecture according to claim 2, wherein the self-interference signal reconstruction unit (100) further comprises a microwave dark box (102), the self-interference reconstruction transmitting antenna (103) and the self-interference reconstruction receiving antenna (104) are installed in the microwave dark box (102), the microwave dark box (102) shields external electromagnetic waves, and the inside does not reflect electromagnetic waves.
4. The apparatus for eliminating same-frequency self-interference applicable to independent transceiving antenna architecture according to claim 2, wherein the self-interference signal reconstructing unit (100) further comprises a power divider (101), and the radio frequency signal output by the transmitter is respectively transmitted to the communication transmitting antenna (301) and the self-interference reconstructing transmitting antenna (103) through two output ends of the power divider.
5. The apparatus for eliminating same-frequency self-interference applicable to independent transceiving antenna architecture according to claim 2, wherein the radio frequency signal output by the transmitter is divided into two identical signals, one of which is sent to the communication transmitting antenna (301) for external transmission, and the other is sent to the self-interference signal reconstructing unit.
6. The same-frequency self-interference cancellation apparatus for independent transceiving antenna architecture according to claim 2, wherein the self-interference reconstruction transmit antenna (103) is consistent with performance parameters of a communication transmit antenna (301), and the self-interference reconstruction receive antenna (104) is consistent with performance parameters of a communication receive antenna (302).
7. The on-channel self-interference cancellation apparatus for an independent transceiving antenna architecture according to claim 1, wherein the self-interference cancellation unit (200) comprises an amplitude and phase adjustment unit (201), a combiner (202), a coupler (203) and a feedback control unit (204); wherein:
the amplitude and phase adjusting unit (201) receives the amplitude adjusting parameter and the phase adjusting parameter sent by the feedback control unit (204), performs amplitude and phase adjustment on the co-channel interference signal sample received from the self-interference signal reconstructing unit (100) according to the amplitude adjusting parameter and the phase adjusting parameter, generates a cancellation signal which has the same amplitude and opposite phase with the self-interference signal received by the communication receiving antenna (302), and sends the cancellation signal to the synthesizer (202);
a synthesizer (202) which adds a self-interference signal received from a communication receiving antenna (302) and a cancellation signal received from an amplitude phase adjusting unit (201), and the same-frequency interference signal is subjected to reverse phase cancellation to obtain a useful signal subjected to interference cancellation and then the useful signal is sent to a coupler (203);
a coupler (203) for outputting the useful signals received from the synthesizer (202) to the receiver and the feedback control unit (204), respectively;
and the feedback control unit (204) receives the useful signal from the coupler (203), generates an amplitude adjustment parameter and a phase adjustment parameter and sends the amplitude adjustment parameter and the phase adjustment parameter to the amplitude phase adjustment unit (201).
8. A method for eliminating same-frequency self-interference suitable for an independent transceiving antenna architecture is characterized by comprising the following steps:
the radio frequency signal output by the transmitter is divided into two paths, one path is sent to a communication transmitting antenna (301) for external transmission, and the other path is sent to a self-interference signal reconstruction unit;
the self-interference signal reconstruction unit (100) receives the radio frequency signal, and a group of self-interference reconstruction transmitting and receiving antennas are adopted to generate co-channel interference signal samples which are transmitted to the self-interference elimination unit (200);
the communication receiving antenna (302) receives radio frequency signals transmitted by the communication transmitting antenna (301) to the outside and sends the radio frequency signals to the self-interference elimination unit (200);
the self-interference elimination unit (200) takes the radio frequency signal received by the communication receiving antenna (302) as a self-interference signal, generates a cancellation signal with the same amplitude and opposite phase with the self-interference signal by using the same-frequency interference signal sample received from the self-interference signal reconstruction unit (100), realizes the interference elimination of the self-interference signal, and sends the useful signal after the interference elimination to a receiver.
9. The method for same-frequency self-interference cancellation for independent transceiving antenna architecture according to claim 8, wherein the self-interference signal reconstructing unit (100) comprises a self-interference reconstructing transmitting antenna (103), a self-interference reconstructing receiving antenna (104), a power splitter (101) and a microwave dark box (102), wherein the self-interference reconstructing transmitting antenna (103) and the self-interference reconstructing receiving antenna (104) are installed in the microwave dark box (102);
The radio frequency signal output by the transmitter is respectively transmitted to a communication transmitting antenna (301) and a self-interference reconstruction transmitting antenna (103) through two output ends of a power divider, the radio frequency signal transmitted by the self-interference reconstruction transmitting antenna (103) is coupled to a self-interference reconstruction receiving antenna (104) in an environment without electromagnetic wave interference in a microwave dark box (102), and the radio frequency signal is sent to a self-interference elimination unit (200) as a same-frequency interference signal sample from the self-interference reconstruction receiving antenna (104).
10. The on-channel self-interference cancellation method for independent transceiving antenna architecture according to claim 8, wherein the self-interference cancellation unit (200) comprises an amplitude and phase adjustment unit (201), a combiner (202), a coupler (203) and a feedback control unit (204); wherein:
an amplitude phase adjustment unit (201) receives an amplitude adjustment parameter and a phase adjustment parameter sent by a feedback control unit (204), performs amplitude and phase adjustment on a co-channel interference signal sample received from a self-interference signal reconstruction unit (100) according to the amplitude adjustment parameter and the phase adjustment parameter, generates a cancellation signal which has the same amplitude and opposite phase with a self-interference signal received by a communication receiving antenna (302), and sends the cancellation signal to a synthesizer (202);
A synthesizer (202) adds a self-interference signal received from a communication receiving antenna (302) and a cancellation signal received from an amplitude phase adjusting unit (201), and a same-frequency interference signal is subjected to reverse phase cancellation to obtain a useful signal subjected to interference cancellation and send the useful signal to a coupler (203);
the coupler (203) outputs the useful signals received from the synthesizer (202) to the receiver and the feedback control unit (204) respectively;
the feedback control unit (204) receives the useful signal from the coupler (203) and sends the generated amplitude adjustment parameter and phase adjustment parameter to the amplitude phase adjustment unit (201).
11. An independent transmit-receive antenna system, characterized by comprising a receiver, a transmitter, a communication transmit antenna (301), a communication receive antenna (302) and the same-frequency self-interference cancellation arrangement of any one of claims 1 to 7.
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