CN115473543B - Same-frequency self-interference elimination device and method suitable for independent receiving and transmitting antenna architecture - Google Patents
Same-frequency self-interference elimination device and method suitable for independent receiving and transmitting antenna architecture Download PDFInfo
- Publication number
- CN115473543B CN115473543B CN202211071825.3A CN202211071825A CN115473543B CN 115473543 B CN115473543 B CN 115473543B CN 202211071825 A CN202211071825 A CN 202211071825A CN 115473543 B CN115473543 B CN 115473543B
- Authority
- CN
- China
- Prior art keywords
- self
- interference
- signal
- reconstruction
- unit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- 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
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/50—Circuits using different frequencies for the two directions of communication
- 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
- H04B1/525—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 with means for reducing leakage of transmitter signal into the receiver
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/14—Two-way operation using the same type of signal, i.e. duplex
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Transceivers (AREA)
- Noise Elimination (AREA)
Abstract
The invention relates to a same-frequency self-interference elimination device and method suitable for an independent receiving and transmitting antenna framework, wherein the same-frequency self-interference elimination device comprises a self-interference signal reconstruction unit and a self-interference elimination unit, a radio frequency signal output by a transmitter is divided into two paths, one path is transmitted to a communication transmitting antenna for external transmission, and the other path is transmitted to the self-interference signal reconstruction unit; the self-interference signal reconstruction unit adopts a group of self-interference reconstruction transceiver 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 to the self-interference signal by utilizing the received same-frequency interference signal sample, so as to realize the interference elimination of the self-interference signal; the self-interference signal sample not only contains linear self-interference components, but also contains passive intermodulation self-interference components caused by an antenna, so that the two self-interference signals can be offset simultaneously by utilizing the opposite phase offset signal generated by the sample signal, and the elimination performance is improved.
Description
Technical Field
The invention relates to a common-frequency self-interference elimination device and a elimination method suitable for an independent receiving and transmitting antenna framework, and belongs to the technical field of wireless communication.
Background
At present, a common wireless duplex communication mode sometimes includes time division duplex and frequency division duplex, the time division duplex is to transmit uplink data and downlink data respectively at different time intervals, and the frequency division duplex is to transmit uplink data and downlink data respectively by adopting different wireless frequency bands. Obviously, if the mode of simultaneous same-frequency is used for full duplex transmission, the spectrum utilization rate can be doubled theoretically, and the simultaneous same-frequency full duplex technology has a very good application prospect due to the fact that the current wireless communication spectrum resources are more and more intense. Meanwhile, the difficulty in realizing the common-frequency full duplex technology is that strong common-frequency interference can be caused to a receiving end of the device when signals are transmitted, so that the far-end common-frequency useful signals are submerged, and the signals cannot be effectively received. Therefore, the premise of realizing the same-frequency full duplex is also that the core difficulty is the same-frequency self-interference elimination.
For the independent receiving and transmitting antenna architecture, if the same-frequency interference elimination is to be realized, the existing method is to divide the signal before entering the transmitting antenna into two paths, one path is sent to the transmitting antenna for transmitting, 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 the same-frequency self-interference signal coupled to the receiving antenna, and the cancellation signal is added with the same-frequency self-interference signal received by the antenna, so that the same-frequency self-interference elimination is realized. The method is to couple out a part of the signal sent to the transmitting antenna as a sample signal, and has the following problems: the actual antenna is not an ideal linear device due to factors such as manufacturing process, and in a high-power system, the nonlinear factor of the antenna can cause generation of higher harmonics, namely passive intermodulation products. Which in turn causes the self-interfering signal to which the self-receiving antenna is coupled to also contain these passive intermodulation products. In conventional schemes, the sample signal used to construct the inverted cancellation signal is taken from before the transmit antenna and does not contain these passive intermodulation products, so this approach cannot effectively cope with nonlinear self-interference components caused by passive intermodulation of the antenna.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a common-frequency self-interference elimination device and an elimination method suitable for an independent receiving and transmitting antenna framework, and the self-interference signal reconstruction unit and the self-interference elimination unit are constructed to realize the interference elimination of self-interference signals and obtain useful signals without interference.
The above object of the present invention is mainly achieved by the following technical solutions:
the common-frequency self-interference elimination device suitable for the independent transceiver 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 transmitted to the communication transmitting antenna for external transmission, and the other path is transmitted to the self-interference signal reconstruction unit;
the self-interference signal reconstruction unit is used for receiving the radio frequency signals, generating co-frequency interference signal samples by adopting a group of self-interference reconstruction transceiver antennas and transmitting the co-frequency interference signal samples to the self-interference elimination unit;
the self-interference elimination unit receives the radio frequency signal transmitted by the communication transmitting antenna through the communication receiving antenna as a self-interference signal, generates a cancellation signal with the same amplitude and opposite phase to the self-interference signal by utilizing the received same-frequency interference signal sample, realizes the interference elimination of the self-interference signal, and transmits the useful signal after the interference elimination to the receiver.
In the same-frequency self-interference cancellation device applicable to the independent transceiver antenna architecture, the self-interference signal reconstruction unit includes a set of self-interference reconstruction transceiver antennas including a self-interference reconstruction transmitting antenna and a self-interference reconstruction receiving antenna, another path of radio frequency signal output by the transmitter is transmitted to the self-interference reconstruction transmitting antenna, 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 wave interference, and is transmitted to the self-interference cancellation unit as a same-frequency interference signal sample.
In the same-frequency self-interference elimination device suitable for the independent receiving and transmitting antenna framework, the self-interference signal reconstruction unit further comprises a microwave camera bellows, the self-interference reconstruction transmitting antenna and the self-interference reconstruction receiving antenna are arranged in the microwave camera bellows, the microwave camera bellows shields external electromagnetic waves, and the internal part does not reflect the electromagnetic waves.
In the same-frequency self-interference cancellation device applicable to the independent receiving and transmitting antenna architecture, the self-interference signal reconstruction unit further comprises a power divider, and radio frequency signals output by the transmitter are respectively transmitted to the communication transmitting antenna and the self-interference reconstruction transmitting antenna through two output ends of the power divider.
In the same-frequency self-interference cancellation device applicable to the independent receiving and transmitting antenna architecture, the radio frequency signal output by the transmitter is divided into two paths of identical signals, one path of the same signal is sent to the communication transmitting antenna for external transmission, and the other path of the same signal is sent to the self-interference signal reconstruction unit.
In the same-frequency self-interference elimination device applicable to the independent receiving and transmitting antenna framework, 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 cancellation device applicable to the independent receiving and transmitting antenna architecture, the self-interference cancellation unit comprises an amplitude phase adjustment unit, a combiner, a coupler and a feedback control unit; wherein:
the amplitude phase adjusting unit is used for receiving the amplitude adjusting parameter and the phase adjusting parameter sent by the feedback control unit, adjusting the amplitude and the phase of the same-frequency interference signal sample received from the self-interference signal reconstruction unit according to the amplitude adjusting parameter and the phase adjusting parameter, generating a cancellation signal with the same amplitude and opposite phase as the self-interference signal received by the communication receiving antenna, and sending the cancellation signal to the synthesizer;
a synthesizer for adding the self-interference signal received from the communication receiving antenna and the offset signal received from the amplitude phase adjusting unit, and the same-frequency interference signal is offset in opposite phase, so as 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 adjustment parameter and a phase adjustment parameter and sends the amplitude adjustment parameter and the phase adjustment parameter to the amplitude phase adjustment unit.
The common-frequency self-interference elimination method suitable for the independent receiving and transmitting antenna architecture comprises the following steps:
the radio frequency signal output by the transmitter is divided into two paths, one path is transmitted to the communication transmitting antenna for external transmission, and the other path is transmitted to the self-interference signal reconstruction unit;
the self-interference signal reconstruction unit receives the radio frequency signals, and a group of self-interference reconstruction transceiver antennas are adopted to generate common-frequency interference signal samples and transmit the common-frequency interference signal samples to the self-interference elimination unit;
the communication receiving antenna receives radio frequency signals externally transmitted by the communication transmitting antenna 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, generates a cancellation signal with the same amplitude and opposite phase to the self-interference signal by utilizing the same-frequency interference signal sample received by the self-interference signal reconstruction unit, realizes the interference elimination of the self-interference signal, and sends the useful signal after the interference elimination to the receiver.
In the same-frequency self-interference elimination method applicable to the independent receiving and transmitting antenna framework, 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 camera bellows, wherein the self-interference reconstruction transmitting antenna and the self-interference reconstruction receiving antenna are arranged in the microwave camera bellows;
the radio frequency signals output by the transmitter are 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 signals transmitted by the self-interference reconstruction transmitting antenna are coupled to the self-interference reconstruction receiving antenna in an environment without electromagnetic wave interference in the microwave camera bellows, and the radio frequency signals are used as co-channel interference signal samples and transmitted to the self-interference elimination unit through the self-interference reconstruction receiving antenna.
In the method for eliminating the same frequency self-interference applicable to the independent receiving and transmitting antenna framework, the self-interference elimination unit comprises an amplitude phase adjustment unit, a combiner, a coupler and a feedback control unit; wherein:
the amplitude phase adjusting unit receives the amplitude adjusting parameter and the phase adjusting parameter sent by the feedback control unit, adjusts the amplitude and the phase of the same-frequency interference signal sample received from the self-interference signal reconstruction unit according to the amplitude adjusting parameter and the phase adjusting parameter, generates a cancellation signal with the same amplitude and opposite phase as the self-interference signal received by the communication receiving antenna, and sends the cancellation signal to the synthesizer;
the synthesizer adds the self-interference signal received from the communication receiving antenna and the offset signal received from the amplitude phase adjusting unit, the same-frequency interference signal is offset in opposite phase, and the obtained useful signal after interference elimination is sent to the coupler;
the coupler outputs useful signals received from the synthesizer to the receiver and the feedback control unit respectively;
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 invention is suitable for the same-frequency self-interference elimination device of an independent receiving and transmitting antenna framework, adopts a group of independent self-interference reconstruction receiving and transmitting antennas to generate the same-frequency interference signal sample, the parameters of the self-interference reconstruction receiving and transmitting antennas are consistent with the performance parameters of the communication receiving and transmitting antennas, and the self-interference signal sample contains self-interference signals of the same frequency components coupled with the communication receiving antennas, and not only contains linear self-interference components, but also contains passive intermodulation self-interference components caused by the antennas, so that the two self-interference signals can be offset simultaneously by utilizing the opposite phase offset signals generated by the sample signals, and the elimination performance is improved.
(2) The self-interference eliminating unit preferably comprises a closed loop formed by an amplitude phase adjusting unit, a combiner, a coupler and a feedback control unit, and can realize the optimal interference eliminating effect by continuously adjusting the amplitude and the phase of the signal.
Drawings
Fig. 1 is a schematic structural diagram of a co-frequency self-interference cancellation device applicable to an independent transceiver antenna architecture according to the present invention;
wherein: 100-self-interference signal reconstruction unit, 101-power divider, 102-microwave camera bellows, 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 and 302-communication receiving antenna;
fig. 2 is a schematic diagram of simulation results of a co-frequency self-interference cancellation device applicable to an independent transceiver antenna architecture in an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the attached drawings and specific examples:
fig. 1 is a schematic structural diagram of a co-frequency self-interference cancellation device applicable to an independent transceiver antenna architecture according to the present invention; the invention realizes the elimination of the same-frequency interference on the basis of the independent receiving and transmitting antenna architecture.
As shown in fig. 1, the single antenna transceiver 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 elimination device of the independent receiving and transmitting antenna framework, comprising: self-interference signal reconstruction unit 100 and self-interference cancellation unit 200;
the self-interference signal reconstruction unit 100 includes: the power divider 101, the microwave camera bellows 102, the self-interference reconstruction transmitting antenna 103 and the 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 oven 102, the microwave oven 102 shields external electromagnetic waves, and electromagnetic waves are not reflected inside.
The self-interference signal reconstruction unit 100 receives the radio frequency signal, and generates an co-channel interference signal sample by using a set of self-interference reconstruction transceiver antennas, and sends the co-channel interference signal sample to the self-interference cancellation unit 200. The self-interference reconstruction receiving antenna 104 is connected to the input of the amplitude phase adjustment unit 201 in the self-interference cancellation unit 200. The radio frequency signal transmitted via the self-interference reconstruction transmitting antenna 103 is coupled to the self-interference reconstruction receiving antenna 104 in an environment where electromagnetic wave interference does not exist, and is delivered to the self-interference cancellation unit as a co-channel interference signal sample. The radio frequency signal output by the transmitter is respectively delivered to the communication transmitting antenna 301 and the self-interference reconstruction transmitting antenna 103 through two output ends of the power divider 101.
The transmitter is connected with the input end of the power divider 101, and the two output ends of the power divider 101 are respectively connected with 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 identical signals, 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 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: an amplitude phase adjusting unit 201, a combiner 202, a coupler 203, and a feedback control unit 204.
The amplitude phase adjusting unit 201 is configured to adjust an amplitude phase of the self-interference sample signal, and generate a cancellation signal having a constant amplitude and an opposite phase to the self-interference signal coupled to the communication receiving antenna 302;
the combiner 202 has two inputs and an output. The two input terminals are respectively connected with the output terminal of the amplitude phase adjusting unit 201 and the communication receiving antenna 302, and the output terminal is connected with the coupler 203.
The combiner 202 adds the mixed signal containing the far-end useful signal and the co-channel interference signal from the communication receiving antenna 302 to the inverted cancellation signal from the amplitude phase adjustment unit 201, and the co-channel interference signal is inverted cancelled, thereby obtaining the useful signal output after interference cancellation.
Coupler 203 has one input and two outputs. The input end is connected to the combiner 202, and the output end is connected to the receiver and the feedback control unit 204 in the self-interference cancellation unit 200, respectively.
The output end of the feedback control unit 204 in the self-interference cancellation unit 200 is connected with the control input end in the self-interference cancellation unit 200, and the feedback control unit 204 performs feedback control on the amplitude phase adjustment unit 201 by detecting the signal power output by the coupler 203, so as to adjust the amplitude and the phase of the cancellation signal in real time, thereby achieving the optimal cancellation performance.
Specifically, the functions of each unit in the self-interference cancellation unit 200 are as follows:
amplitude phase adjustment section 201 receives the amplitude adjustment parameter and the phase adjustment parameter transmitted from feedback control section 204, adjusts the amplitude and the phase of the co-channel interference signal sample received from self-interference signal reconstruction section 100 based on the amplitude adjustment parameter and the phase adjustment parameter, generates a cancellation signal having the same amplitude and the opposite phase as the self-interference signal received by communication receiving antenna 302, and transmits the cancellation signal to synthesizer 202.
The synthesizer 202 adds the self-interference signal received from the communication receiving antenna 302 to the cancellation signal received from the amplitude phase adjustment unit 201, and the same-frequency interference signal is cancelled in an inverted phase, and the obtained interference-cancelled useful signal is transmitted to the coupler 203.
The coupler 203 outputs the useful signals received from the synthesizer 202 to the receiver and feedback control unit 204, respectively.
The feedback control unit 204 generates the amplitude adjustment parameter and the phase adjustment parameter from the useful signal received from the coupler 203, and sends the amplitude adjustment parameter and the phase adjustment parameter to the amplitude phase adjustment unit 201.
The feedback control unit 204 receives the signal y (t), and detects the voltage value of y (t) through the detection circuit. The initial values of the amplitude adjustment parameter and the phase adjustment parameter are set, the feedback control unit 204 adjusts the amplitude adjustment parameter and the phase adjustment parameter according to the set step value, and then sends the amplitude adjustment parameter and the phase adjustment parameter to the amplitude phase adjustment unit 201, and 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 in the data cycle sending process, the step adjustment strategy is correct, and the amplitude adjustment parameter and the phase adjustment parameter are continuously adjusted according to the last step value. Otherwise, if the useful signal y (t) received by the feedback control unit 204 from the coupler 203 again is greater than or equal to the useful signal y (t) received last time, the step adjustment strategy is changed, and the reverse direction change (for example, the original increase and the current decrease) is performed according to the set step value, and the final objective 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 paths of identical signals X (t) and X ' (t) by a power divider 101, X (t) =x ' (t), X (t) is input to a communication transmission antenna 301 for transmission, and X ' (t) is input to an interference signal reconstruction unit 100 for generating an interference sample signal of the same frequency;
the output signal r (t) of the communication receiving antenna 302 is as shown in equation (1):
r(t)＝a 0 x(t-Δt 0 )+b 0 w(t)+u(t) (1)
wherein a is 0 x(t-Δt 0 ) For the co-frequency self-interference signal from the communication transmitting antenna 301 to which the communication receiving antenna 302 is coupled, the co-frequency self-interference signal belongs to the linear component of the co-frequency self-interference signal, and only the amplitude and the phase are different; 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 the same-frequency self-interference signal; u (t) is a useful signal received by the communication receiving antenna 302 from another wireless device;
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, the self-interference reconstruction transmitting antenna 103 and the self-interference reconstruction receiving antenna 104 are both arranged in the microwave camera bellows 102 and do not receive external electromagnetic signals, and no electromagnetic reflection exists in the microwave camera bellows, so that the signal r' (t) output from the self-interference reconstruction receiving antenna 104 of the self-interference signal reconstruction unit 100 only comprises the same-frequency self-interference signal component, including a linear component and a nonlinear component, as shown in the formula (2):
r'(t)＝a 1 x'(t-Δt 1 )+b 1 w(t) (2)
taking r' (t) as a reference signal, the signal is input to the self-interference cancellation unit 200, and the amplitude phase adjustment unit 201 of the self-interference cancellation unit 200 performs amplitude phase adjustment to obtain a cancellation signal c (t) having the same amplitude and opposite phase to 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)
after the addition and cancellation of the combiner 202, a signal y (t) after the co-channel interference signal is eliminated is finally obtained, as shown in the formula (4):
y(t)＝r(t)+c(t)＝u(t) (4)
the feedback control unit 204 detects the y (t) signal power value through the coupler 203, and adjusts the amplitude phase adjusting unit 201 of the self-interference cancellation unit 200 in real time, so as to achieve the optimal 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, and a set of self-interference reconstruction transceiver antennas are adopted to generate a same-frequency interference signal sample and transmit the same-frequency interference signal sample to the self-interference cancellation unit 200;
3. the communication receiving antenna 302 receives the radio frequency signal externally transmitted by the communication transmitting antenna 301 and sends 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 having the same amplitude as and opposite to the self-interference signal by using the same-frequency interference signal sample received from the self-interference signal reconstruction unit 100, performs interference cancellation on the self-interference signal, and transmits the useful signal after interference cancellation to the receiver.
The invention provides an independent receiving and transmitting 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 receiving and transmitting antenna framework, which is characterized in that an independent self-interference signal reconstruction unit is designed aiming at the independent receiving and transmitting antenna framework, and the unit consists of a set of self-interference reconstruction antennas and a microwave camera. The number of self-interference reconstruction antennas is two, and for convenience of distinction, the two antennas are respectively named as: self-interference reconstructed transmitting antenna, self-interference reconstructed receiving antenna. The transceiver antenna for communication from outside is named: a communication transmitting antenna and a communication receiving antenna. The parameters of the self-interference reconstruction transceiver antenna are completely consistent with the performance parameters of the communication transceiver antenna. The self-interference reconstruction antenna is arranged in the microwave camera bellows, does not receive electromagnetic waves in the external space, does not have reflection in the microwave camera bellows, and signals transmitted by the self-interference reconstruction transmitting antenna are coupled to the self-interference reconstruction receiving antenna through space transmission in the microwave camera bellows. 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. Since the self-interference reconstruction antenna is consistent with the transceiver antenna performance parameters of the external communication, a sample signal containing the same passive intermodulation components is generated as output by the external communication transmitting antenna. After passing through the self-interference cancellation unit, the sample signal generates cancellation signals with the same amplitude and the opposite phase as the self-interference signals coupled to the communication receiving antenna, and the self-interference signals are cancelled in the opposite phase after combined and added.
Example 1
The simulation model is built under the 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, through simulation, the spectrum of the same-frequency interference signal is shown in figure 2 before and after the same-frequency self-interference elimination device suitable for an independent receiving and transmitting antenna framework is accessed, the power of the same-frequency interference signal received by a receiver is about 7.2dBm when the same-frequency self-interference elimination device suitable for the independent receiving and transmitting antenna framework is not accessed, and the power of the same-frequency interference signal received by the receiver is reduced to-71.879 dBm after the same-frequency self-interference elimination device suitable for the independent receiving and transmitting antenna framework is accessed, so that the same-frequency self-interference elimination capability of about 79dB is realized.
The foregoing is merely illustrative of the best embodiments of the present invention, and the present invention is not limited thereto, but any changes or substitutions easily contemplated by those skilled in the art within the scope of the present invention should be construed as falling within the scope of the present invention.
What is not described in detail in the present specification belongs to the known technology of those skilled in the art.
Claims (11)
1. The co-frequency self-interference cancellation device suitable for an independent transceiver antenna architecture, wherein the independent transceiver antenna architecture comprises a receiver, a transmitter, a communication transmitting antenna (301) and a communication receiving antenna (302), and the co-frequency self-interference cancellation device is characterized by comprising 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 transmitted to a communication transmitting antenna (301) for external transmission, and the other path is transmitted to a self-interference signal reconstruction unit (100);
the self-interference signal reconstruction unit (100) is used for receiving the radio frequency signals, generating co-frequency interference signal samples by adopting a group of self-interference reconstruction transceiver antennas and transmitting the co-frequency interference signal samples to the self-interference elimination unit (200);
the self-interference elimination unit (200) receives the radio frequency signal transmitted by the communication transmitting antenna (301) through the communication receiving antenna (302) as a self-interference signal, generates a cancellation signal with the same amplitude and opposite phase to the self-interference signal by utilizing the received same-frequency interference signal sample, realizes the interference elimination of the self-interference signal, and transmits the useful signal after the interference elimination to the receiver.
2. The co-channel self-interference cancellation device according to claim 1, wherein the self-interference signal reconstruction unit (100) comprises a set of self-interference reconstruction transmit antennas (103) and a set of self-interference reconstruction receive antennas (104), the other radio frequency signal output by the transmitter is transmitted to the self-interference reconstruction transmit antennas (103), the radio frequency signal transmitted by the self-interference reconstruction transmit antennas (103) is coupled to the self-interference reconstruction receive antennas (104) in an environment without electromagnetic interference, and the radio frequency signal is transmitted to the self-interference cancellation unit as a co-channel interference signal sample.
3. The co-channel self-interference cancellation device applicable to the independent transceiving antenna architecture according to claim 2, wherein the self-interference signal reconstruction unit (100) further comprises a microwave camera bellows (102), the self-interference reconstruction transmitting antenna (103) and the self-interference reconstruction receiving antenna (104) are installed in the microwave camera bellows (102), and the microwave camera bellows (102) shields external electromagnetic waves and does not reflect electromagnetic waves.
4. The co-channel self-interference cancellation device applicable to an independent transceiver antenna architecture according to claim 2, wherein the self-interference signal reconstruction 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 reconstruction transmitting antenna (103) through two output ends of the power divider.
5. The co-frequency self-interference cancellation device applicable to an independent transceiver antenna architecture according to claim 2, wherein the radio frequency signal output by the transmitter is split into two identical signals, one is sent to the communication transmitting antenna (301) for external transmission, and the other is sent to the self-interference signal reconstruction unit.
6. The co-channel self-interference cancellation device adapted for independent transceiving antenna architecture according to claim 2, characterized in that said self-interference reconstruction transmitting antenna (103) is consistent with performance parameters of a communication transmitting antenna (301), and said self-interference reconstruction receiving antenna (104) is consistent with performance parameters of a communication receiving antenna line (302).
7. The co-frequency self-interference cancellation device applicable to an independent transceiving antenna architecture according to claim 1, characterized in that said self-interference cancellation unit (200) comprises an amplitude phase adjustment unit (201), a combiner (202), a coupler (203) and a feedback control unit (204); wherein:
an amplitude phase adjustment unit (201) for receiving the amplitude adjustment parameter and the phase adjustment parameter transmitted by the feedback control unit (204), performing amplitude and phase adjustment on the same-frequency interference signal sample received from the self-interference signal reconstruction unit (100) according to the amplitude adjustment parameter and the phase adjustment parameter, generating a cancellation signal with the same amplitude and opposite phase as the self-interference signal received by the communication receiving antenna (302), and transmitting the cancellation signal to the synthesizer (202);
a synthesizer (202) for adding the self-interference signal received from the communication receiving antenna (302) to the cancellation signal received from the amplitude phase adjustment unit (201), and for canceling the same-frequency interference signal in opposite phase, thereby obtaining an interference-canceled useful signal and transmitting the useful signal to the coupler (203);
a coupler (203) for outputting the useful signals received from the synthesizer (202) to a receiver and a feedback control unit (204), respectively;
a 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. The common-frequency self-interference elimination method suitable for the independent receiving and transmitting 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 transmitted to a communication transmitting antenna (301) for external transmission, and the other path is transmitted to a self-interference signal reconstruction unit;
the self-interference signal reconstruction unit (100) receives the radio frequency signals, and a group of self-interference reconstruction receiving and transmitting antennas are adopted to generate co-frequency interference signal samples and transmit the co-frequency interference signal samples to the self-interference elimination unit (200);
a communication receiving antenna (302) receives a radio frequency signal externally transmitted by a communication transmitting antenna (301) and transmits the radio frequency signal to a self-interference eliminating unit (200);
the self-interference cancellation unit (200) uses 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 to the self-interference signal by using the same-frequency interference signal sample received by the self-interference signal reconstruction unit (100), realizes interference cancellation of the self-interference signal, and transmits the useful signal after interference cancellation to a receiver.
9. The method for co-channel self-interference cancellation applicable to independent transceiver antenna architecture according to claim 8, wherein the self-interference signal reconstruction unit (100) comprises a self-interference reconstruction transmitting antenna (103), a self-interference reconstruction receiving antenna (104), a power divider (101) and a microwave camera bellows (102), and the self-interference reconstruction transmitting antenna (103) and the self-interference reconstruction receiving antenna (104) are installed in the microwave camera bellows (102);
the radio frequency signals output by the transmitter are respectively transmitted to a communication transmitting antenna (301) and a self-interference reconstruction transmitting antenna (103) through two output ends of the power divider, the radio frequency signals transmitted by the self-interference reconstruction transmitting antenna (103) are coupled to a self-interference reconstruction receiving antenna (104) in an environment without electromagnetic wave interference in a microwave camera bellows (102), and the radio frequency signals are transmitted to a self-interference elimination unit (200) as co-channel interference signal samples by the self-interference reconstruction receiving antenna (104).
10. The method for co-channel self-interference cancellation applicable to an independent transmit-receive antenna architecture according to claim 8, wherein the self-interference cancellation unit (200) comprises an amplitude phase adjustment unit (201), a combiner (202), a coupler (203) and a feedback control unit (204); wherein:
an amplitude phase adjustment unit (201) receives the amplitude adjustment parameter and the phase adjustment parameter sent by the feedback control unit (204), carries out amplitude and phase adjustment on the same-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 synthesizer (202) adds the self-interference signal received from the communication receiving antenna (302) and the offset signal received from the amplitude phase adjusting unit (201), the same-frequency interference signal is offset in opposite phase, and the obtained useful signal after interference elimination is sent to the coupler (203);
the coupler (203) outputs the useful signals received from the synthesizer (202) to the receiver and the feedback control unit (204), respectively;
a feedback control unit (204) receives the useful signal from the coupler (203) and sends the generated amplitude adjustment parameter and phase adjustment parameter to an amplitude phase adjustment unit (201).
11. A separate transceiver antenna system comprising a receiver, a transmitter, a communication transmitting antenna (301), a communication receiving antenna (302) and the co-channel self-interference cancellation device according to any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211071825.3A CN115473543B (en) | 2022-08-31 | 2022-08-31 | Same-frequency self-interference elimination device and method suitable for independent receiving and transmitting antenna architecture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211071825.3A CN115473543B (en) | 2022-08-31 | 2022-08-31 | Same-frequency self-interference elimination device and method suitable for independent receiving and transmitting antenna architecture |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115473543A CN115473543A (en) | 2022-12-13 |
| CN115473543B true CN115473543B (en) | 2023-08-11 |
Family
ID=84369026
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211071825.3A Active CN115473543B (en) | 2022-08-31 | 2022-08-31 | Same-frequency self-interference elimination device and method suitable for independent receiving and transmitting antenna architecture |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115473543B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6998908B1 (en) * | 2003-06-10 | 2006-02-14 | Rockwell Collins, Inc. | Adaptive interference cancellation receiving system using synthesizer phase accumulation |
| CN103427874A (en) * | 2013-09-03 | 2013-12-04 | 电子科技大学 | System and method for canceling high-transmission-power same-time same-frequency self-interference under multi-path environment |
| CN106788579A (en) * | 2016-12-19 | 2017-05-31 | 上海交通大学 | With interior full-duplex wireless communication systems and its Reflection Optical Thin Film system |
| CN110166078A (en) * | 2019-05-13 | 2019-08-23 | 西安电子科技大学 | Co-channel full duplex single antenna relay system while based on fractal microstrip coupler group |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8842584B2 (en) * | 2012-07-13 | 2014-09-23 | At&T Intellectual Property I, L.P. | System and method for full duplex cancellation |
| US9203455B2 (en) * | 2012-08-14 | 2015-12-01 | Broadcom Corporation | Full duplex system with self-interference cancellation |
| CN107231168B (en) * | 2017-08-11 | 2019-10-01 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | A kind of cancellation element and removing method of self-interference signal |
| CN116318240A (en) * | 2019-04-25 | 2023-06-23 | 华为技术有限公司 | Full duplex self-interference elimination method and device |
-
2022
- 2022-08-31 CN CN202211071825.3A patent/CN115473543B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6998908B1 (en) * | 2003-06-10 | 2006-02-14 | Rockwell Collins, Inc. | Adaptive interference cancellation receiving system using synthesizer phase accumulation |
| CN103427874A (en) * | 2013-09-03 | 2013-12-04 | 电子科技大学 | System and method for canceling high-transmission-power same-time same-frequency self-interference under multi-path environment |
| CN106788579A (en) * | 2016-12-19 | 2017-05-31 | 上海交通大学 | With interior full-duplex wireless communication systems and its Reflection Optical Thin Film system |
| CN110166078A (en) * | 2019-05-13 | 2019-08-23 | 西安电子科技大学 | Co-channel full duplex single antenna relay system while based on fractal microstrip coupler group |
Non-Patent Citations (1)
| Title |
|---|
| 接收机带内双频阻塞干扰机理建模与验证;王雅平;魏光辉;李伟;潘晓东;尚在飞;万浩江;;北京理工大学学报(07);53-58 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115473543A (en) | 2022-12-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8036606B2 (en) | Method and apparatus for interference cancellation | |
| CN106301516B (en) | Diversity receiver and terminal | |
| US9325433B2 (en) | High dynamic range transceiver | |
| CN109560833B (en) | Downlink carrier aggregation radio frequency circuit, antenna device and electronic equipment | |
| CN105634540B (en) | Radio frequency system applied to co-channel full duplex system simultaneously | |
| CN112054816B (en) | Full-integrated full-duplex transceiver based on active quasi-circulator and self-interference cancellation | |
| CN111600620B (en) | Cancellation method of analog cancellation device for eliminating interference | |
| CN111917424B (en) | Low-emission broadband noise no-load short-wave radio station and implementation method thereof | |
| CN105763221A (en) | Radio frequency circuit and interference suppression method | |
| CN111130463B (en) | Low-noise-coefficient, broadband and high-isolation active quasi-circulator based on double cancellation | |
| CN110731054B (en) | Method and apparatus for controlling harmonic interference | |
| CN101262300B (en) | Chaos interference system for chaos synchronization | |
| CN115473543B (en) | Same-frequency self-interference elimination device and method suitable for independent receiving and transmitting antenna architecture | |
| Lampu et al. | Cancellation of air-induced passive intermodulation in FDD MIMO systems: Low-complexity cascade model and measurements | |
| CN105429654A (en) | Frequency synthesizer for S-band wave observation radar | |
| CN110149122B (en) | Radio frequency self-interference cancellation device and method for wide frequency coverage | |
| Zhang et al. | Multichannel Adaptive Interference Cancellation for Full-Duplex High Power AM Radios | |
| CN115021766B (en) | Co-channel interference elimination device suitable for single antenna framework of circulator | |
| CN113055120B (en) | Photonic broadband radio frequency interference cancellation method combined with phase pre-chirp | |
| Mohan et al. | Theoretical analysis of antenna cancellation technique in full-duplex communication system | |
| Chu et al. | Digital Domain Self-Interference Cancellation Based on Modified Variable Step-Size LMS Algorithm | |
| RU2767751C1 (en) | Method of suppressing command signals for controlling radio-controlled improvised explosive devices, ultra-wideband radio signal processor device for blocking command signals of radio-controlled explosive devices and a method of operating an ultra-wideband device for suppressing command signals for controlling radio-controlled improvised explosive devices | |
| Jha et al. | Spectral efficiency enhancements utilizing analog RF frontend in-band interference cancellation | |
| WO2023109856A1 (en) | Communication transceiver, signal transceiving method, electronic device and storage medium | |
| Eero et al. | Small size receiver band self-interference cancellation amplifier for 4G transceivers |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |