CN-122001403-A - Self-interference signal elimination method, sub-band full duplex system and electronic equipment

CN122001403ACN 122001403 ACN122001403 ACN 122001403ACN-122001403-A

Abstract

The invention provides a self-interference signal elimination method, which comprises the steps that a linear cancellation module adjusts the attribute of an auxiliary receiving link to improve the signal to noise ratio of the auxiliary receiving link, a linear switch module switches a sub-band full duplex system to a self-interference channel cancellation mode based on the control of an auxiliary receiving link control and signal processing module after the attribute of the auxiliary receiving link is adjusted, a transmitting unit combines an input signal of the transmitting link processed by the auxiliary receiving link after the attribute is adjusted with an output signal of the transmitting link to obtain an auxiliary receiving link signal and sends the auxiliary receiving link signal to the auxiliary receiving link control and signal processing module, and a receiving unit sends a target signal to a digital cancellation module, wherein the auxiliary receiving link control and signal processing module instructs the digital cancellation module to eliminate the self-interference signal in the target signal according to the auxiliary receiving link signal. The present disclosure also provides a sub-band full duplex system and an electronic device.

Inventors

WANG XIYU
ZHANG XINGMIN
WANG SHAN
DUAN YAJUAN
ZHANG QINGQING
BIE YENAN

Assignees

中兴通讯股份有限公司

Dates

Publication Date: 20260508
Application Date: 20241106

Claims (16)

1. A self-interference signal elimination method is applied to a sub-band full-duplex system, the sub-band full-duplex system comprises a digital baseband signal processing unit, a transmitting unit and a receiving unit, the digital baseband signal processing unit comprises an auxiliary receiving link control and signal processing module and a digital cancellation module, the digital cancellation module is connected with the auxiliary receiving link control and signal processing module, the transmitting unit comprises an auxiliary receiving link and a transmitting link, the auxiliary receiving link comprises a linear cancellation module and a linear switch module, the linear cancellation module is connected with the linear switch module, and the linear switch module is connected with the auxiliary receiving link control and signal processing module, the method comprises the following steps: the linear cancellation module adjusts the attribute of the auxiliary receiving link to improve the signal-to-noise ratio of the auxiliary receiving link; After the attribute of the auxiliary receiving link is adjusted, the linear switch module switches the sub-band full duplex system to a self-interference channel offset mode based on the control of the auxiliary receiving link control and signal processing module; The linear switch module combines the input signal of the transmitting link processed by the auxiliary receiving link after attribute adjustment with the output signal of the transmitting link to obtain an auxiliary receiving link signal, and sends the auxiliary receiving link signal to the auxiliary receiving link control and signal processing module; The receiving unit sends a target signal to the digital cancellation module, and the auxiliary receiving link control and signal processing module instructs the digital cancellation module to cancel a self-interference signal in the target signal according to the auxiliary receiving link signal.
2. The method of claim 1, wherein the linear cancellation module is connected to the auxiliary receiving link control and signal processing module, and the linear cancellation module adjusts the attribute of the auxiliary receiving link, including the linear cancellation module receiving an adjustment parameter sent by the auxiliary receiving link control and signal processing module, and adjusting the attribute of the auxiliary receiving link according to the adjustment parameter; the step of determining the adjustment parameter by the auxiliary receiving link control and signal processing module comprises the following steps: The auxiliary receiving link control and signal processing module controls the linear switch module, switches the sub-band full duplex system to an auxiliary receiving link channel test mode, and calculates an auxiliary receiving link channel response; the auxiliary receiving link control and signal processing module controls the linear switch module, switches the sub-band full duplex system to a cancellation channel test mode, and calculates cancellation link channel response; The auxiliary receiving link control and signal processing module determines the adjustment parameters according to the auxiliary receiving link channel response and the counteracted link channel response.
3. The method of claim 2, wherein the secondary receive link control and signal processing module determining the adjustment parameter from the secondary receive link channel response and the cancellation link channel response comprises: The auxiliary receiving link control and signal processing module calculates a channel response difference according to the auxiliary receiving link channel response and the counteracted link channel response; Determining an adjustment parameter according to the channel response difference; and adjusting the adjustment parameters until the attribute of the auxiliary receiving link meets a preset convergence condition, wherein the attribute of the auxiliary receiving link comprises at least one of amplitude, phase and time delay.
4. The method of claim 2, wherein the auxiliary receiving link control and signal processing module comprises a gain compensation sub-module, a data processing sub-module and a control sub-module, the data processing sub-module being respectively connected with the gain compensation sub-module and the control sub-module; The auxiliary receiving link control and signal processing module controls the linear switch module to switch the sub-band full duplex system to an auxiliary receiving link channel test mode and calculate an auxiliary receiving link channel response, and the method comprises the following steps: The control submodule controls the linear switch module to switch the sub-band full duplex system to an auxiliary receiving link channel test mode; The gain compensation submodule receives a first auxiliary receiving link signal sent by the transmitting unit, and performs gain compensation on the first auxiliary receiving link signal to obtain a first processing signal; the data processing sub-module determines an auxiliary receiving link channel response based on the first processing signal and the first baseband signal transmitted by the baseband processing module, and/or, The auxiliary receiving link control and signal processing module controls the linear switch module to switch the sub-band full duplex system to a cancellation channel test mode and calculate a cancellation link channel response, and the method comprises the following steps: the control submodule controls the linear switch module to switch the sub-band full duplex system to the cancellation channel test mode; the gain compensation submodule receives a second auxiliary receiving link signal sent by the transmitting unit, and performs gain compensation on the second auxiliary receiving link signal to obtain a second processing signal; And the data processing sub-module determines to cancel the link channel response according to the second processing signal and the second baseband signal sent by the baseband processing module.
5. The method of claim 1, wherein the auxiliary receiving link control and signal processing module comprises a gain compensation sub-module, a data processing sub-module and a control sub-module, the data processing sub-module being respectively connected with the gain compensation sub-module and the control sub-module; the auxiliary receiving link control and signal processing module instructs the digital cancellation module to cancel the self-interference signal in the target signal according to the auxiliary receiving link signal, including: The gain compensation submodule receives a third auxiliary receiving link signal sent by the transmitting unit in the self-interference channel offset mode, and performs gain compensation on the third auxiliary receiving link signal to obtain a third processing signal; The data processing sub-module performs filtering and frequency shifting operation on the third processing signal to obtain a reference signal; And the digital cancellation module eliminates the self-interference signal in the target signal according to the reference signal to obtain a processed target signal, and sends the processed target signal to the baseband processing module.
6. The method of claim 1, wherein the digital baseband signal processing unit further comprises a baseband processing module, the transmitting unit further comprises a baseband signal processing module and a filtering coupling module, a baseband receiving end of the baseband signal processing module is connected with the baseband processing module, an auxiliary receiving end of the baseband signal processing module is connected with the linear switch module, a radio frequency transmitting end of the baseband signal processing module is connected with the filtering coupling module, and the filtering coupling module is positioned in the transmitting link and is connected with the linear switch module; The step of combining the output signal of the transmitting link with the input signal of the transmitting link processed by the auxiliary receiving link to obtain an auxiliary receiving link signal includes: the filtering coupling module is used for filtering and coupling the first radio frequency signal output by the radio frequency transmitting end of the baseband signal processing module to obtain a second radio frequency signal, wherein the first radio frequency signal is an input signal of the transmitting link, and the second radio frequency signal is an output signal of the transmitting link; the linear cancellation module processes the first radio frequency signal output by the radio frequency transmitting end of the baseband signal processing module to obtain a third radio frequency signal; The linear switch module controls the sub-band full duplex system to be in the self-interference channel offset mode based on the auxiliary receiving link control and signal processing module, combines the third radio frequency signal and the second radio frequency signal to obtain the auxiliary receiving link signal under the self-interference channel offset mode, and sends the auxiliary receiving link signal to an auxiliary receiving end of the baseband signal processing module.
7. The method of claim 6, wherein the linear cancellation module adjusts the attribute of the auxiliary receiving link, comprising the linear cancellation module receiving an adjustment parameter sent by the auxiliary receiving link control and signal processing module, and adjusting the attribute of the auxiliary receiving link according to the adjustment parameter, wherein the linear cancellation module comprises an analysis sub-module and an adjustment sub-module, the analysis sub-module is connected with the auxiliary receiving link control and signal processing module, and the adjustment sub-module is connected with a radio frequency transmitting end of the baseband signal processing module; The linear cancellation module processes the first radio frequency signal output by the radio frequency transmitting end of the baseband signal processing module to obtain a third radio frequency signal, and the method comprises the following steps: The analysis submodule analyzes the adjustment parameters sent by the auxiliary receiving link control and signal processing module to obtain target adjustment parameters, and sends the target adjustment parameters to the adjustment submodule; And the adjustment sub-module adjusts the first radio frequency signal according to the target adjustment parameter to obtain the third radio frequency signal.
8. The method of claim 6, wherein the linear switch module comprises a combining sub-module, a first switch, and a second switch, a first end of the first switch being connected to a second end of the combining sub-module or the second switch, a first end of the second switch being connected to the combining sub-module or a second end of the second switch being connected to a first end of the first switch, and the first switch being connected to the filtering coupling module and the auxiliary receive link control and signal processing module, respectively, and the second switch being connected to an auxiliary receive end of the baseband signal processing module and the auxiliary receive link control and signal processing module, respectively; the linear switch module controls the sub-band full duplex system to be in the self-interference channel offset mode based on the auxiliary receiving link control and signal processing module, and combines the third radio frequency signal and the second radio frequency signal to obtain the auxiliary receiving link signal in the self-interference channel offset mode, and the linear switch module comprises: the first switch and the second switch control the first end of the first switch and the first end of the second switch to be respectively connected with the merging submodule according to the control signal sent by the auxiliary receiving link control and signal processing module, so as to control the sub-band full duplex system to be in the self-interference channel offset mode, and in the self-interference channel offset mode, the third radio frequency signal and the second radio frequency signal are merged to obtain the auxiliary receiving link signal.
9. The method of any of claims 1-8, wherein the linear cancellation module adjusts a property of the auxiliary receive link to improve a signal-to-noise ratio of the auxiliary receive link, comprising: and according to a preset period, the linear cancellation module adjusts the attribute of the auxiliary receiving link so as to improve the signal-to-noise ratio of the auxiliary receiving link.
10. The sub-band full duplex system comprises a digital baseband signal processing unit, a transmitting unit and a receiving unit, wherein the digital baseband signal processing unit comprises an auxiliary receiving link control and signal processing module and a digital counteracting module, and the digital counteracting module is connected with the auxiliary receiving link control and signal processing module; The linear cancellation module is used for adjusting the attribute of the auxiliary receiving link to improve the signal to noise ratio of the auxiliary receiving link, switching the sub-band full duplex system to a self-interference channel cancellation mode based on the control of the auxiliary receiving link control and signal processing module after the attribute of the auxiliary receiving link is adjusted, combining the input signal of the transmitting link processed by the auxiliary receiving link after the attribute is adjusted with the output signal of the transmitting link to obtain an auxiliary receiving link signal, and transmitting the auxiliary receiving link signal to the auxiliary receiving link control and signal processing module; The receiving unit is used for sending a target signal to the digital cancellation module; The auxiliary receiving link control and signal processing module is used for indicating the digital cancellation module to cancel the self-interference signal in the target signal according to the auxiliary receiving link signal in the self-interference channel cancellation mode.
11. The sub-band full duplex system according to claim 10, wherein the auxiliary receiving link control and signal processing module comprises a gain compensation sub-module, a data processing sub-module and a control sub-module, the data processing sub-module is respectively connected with the gain compensation sub-module and the control sub-module; The control submodule is used for controlling the linear switch module to switch the sub-band full duplex system to an auxiliary receiving link channel test mode or a cancellation channel test mode; The gain compensation submodule is used for receiving a first auxiliary receiving link signal sent by the transmitting unit in the auxiliary receiving link channel test mode, carrying out gain compensation on the first auxiliary receiving link signal to obtain a first processing signal, and sending the first processing signal to the data processing submodule, or receiving a second auxiliary receiving link signal sent by the transmitting unit in the cancellation channel test mode, carrying out gain compensation on the second auxiliary receiving link signal to obtain a second processing signal, and sending the second processing signal to the data processing submodule; the data processing submodule is used for determining auxiliary receiving link channel response according to the first processing signal and the first baseband signal sent by the baseband processing module, or determining canceling link channel response according to the second processing signal and the second baseband signal sent by the baseband processing module.
12. The sub-band full duplex system according to claim 11, wherein, The gain compensation sub-module is further configured to receive a third auxiliary receiving link signal sent by the transmitting unit in the self-interference channel cancellation mode, perform gain compensation on the third auxiliary receiving link signal to obtain a third processing signal, and send the third processing signal to the data processing sub-module; The data processing sub-module is further configured to perform filtering and frequency shifting operations on the third processing signal to obtain a reference signal, and send the reference signal to the digital cancellation module; The digital cancellation module is used for eliminating the self-interference signal in the target signal according to the reference signal, obtaining a processed target signal, and sending the processed target signal to the baseband processing module.
13. The sub-band full duplex system according to claim 10, wherein the digital baseband signal processing unit further comprises a baseband processing module, the transmitting unit further comprises a baseband signal processing module and a filtering coupling module, wherein a baseband receiving end of the baseband signal processing module is connected with the baseband processing module, an auxiliary receiving end of the baseband signal processing module is connected with the linear switch module, a radio frequency transmitting end of the baseband signal processing module is connected with the filtering coupling module, and the filtering coupling module is positioned in the transmitting link and is connected with the linear switch module; The filtering coupling module is used for filtering and coupling a first radio frequency signal output by a radio frequency transmitting end of the baseband signal processing module to obtain a second radio frequency signal, wherein the first radio frequency signal is an input signal of the transmitting link, and the second radio frequency signal is an output signal of the transmitting link; The linear cancellation module is used for processing the first radio frequency signal output by the radio frequency transmitting end of the baseband signal processing module to obtain a third radio frequency signal; The linear switch module is configured to control the sub-band full duplex system to be in the self-interference channel cancellation mode based on the auxiliary receiving link control and signal processing module, combine the third radio frequency signal with the second radio frequency signal in the self-interference channel cancellation mode to obtain the auxiliary receiving link signal, and send the auxiliary receiving link signal to an auxiliary receiving end of the baseband signal processing module.
14. The sub-band full duplex system according to claim 13, wherein the linear cancellation module is configured to receive an adjustment parameter sent by the auxiliary receiving link control and signal processing module, and adjust an attribute of the auxiliary receiving link according to the adjustment parameter; The linear cancellation module comprises an analysis sub-module and an adjustment sub-module, wherein the analysis sub-module is connected with the auxiliary receiving link control and signal processing module, and the adjustment sub-module is connected with a radio frequency transmitting end of the baseband signal processing module; The analysis submodule is used for analyzing the adjustment parameters sent by the auxiliary receiving link control and signal processing module to obtain target adjustment parameters and sending the target adjustment parameters to the adjustment submodule; The adjusting submodule is used for adjusting the first radio frequency signal according to the target adjusting parameter to obtain the third radio frequency signal.
15. The sub-band full duplex system according to claim 13, wherein the linear switch module 24 comprises a combining sub-module, a first switch and a second switch, the combining sub-module is connected to the adjusting sub-module, a first end of the first switch is connected to a second end of the combining sub-module or the second switch, a first end of the second switch is connected to the combining sub-module or a second end of the second switch is connected to a first end of the first switch, and the first switch is connected to the filtering coupling module and the auxiliary receiving link control and signal processing module, respectively, and the second switch is connected to an auxiliary receiving end of the baseband signal processing module and the auxiliary receiving link control and signal processing module, respectively; The first switch and the second switch are used for controlling the first end of the first switch and the first end of the second switch to be respectively connected with the combining submodule according to the control signal sent by the auxiliary receiving link control and signal processing module, so as to control the sub-band full duplex system to be in the self-interference channel offset mode, and combining the third radio frequency signal with the second radio frequency signal in the self-interference channel offset mode to obtain the auxiliary receiving link signal.
16. An electronic device comprising the sub-band full duplex system of any of claims 10 to 15.

Description

Self-interference signal elimination method, sub-band full duplex system and electronic equipment Technical Field The disclosure relates to the technical field of communication, and in particular relates to a self-interference signal elimination method, a sub-band full duplex system and electronic equipment. Background The explosion of wireless communication traffic has grown in recent years, such that the problem of spectrum bandwidth resource shortage has become more and more serious. Therefore, various communication providers and researchers are seeking schemes for enhancing spectral efficiency, and have solved the problems of insufficient utilization of spectrum resources and high delay of conventional FDD (Frequency Division Duplexing, frequency division duplex) and TDD (Time Division Duplexing, time division duplex). The full duplex technology of sub-bands adjacent to the transceiving frequency band at the same time is the current focus technology, so that the frequency spectrum efficiency is effectively solved, and the throughput is improved. Subband duplexing techniques are techniques in which a different DL (downlink) and UL (uplink) subbands are partitioned in a frequency band, with DL and UL being processed simultaneously. In the TDD mode, one frequency band is divided into 2 subbands, and the frame structure is DFFFU. At the F time slot, the transmit nonlinearity and noise floor of the transmit subband may affect the reception of the receive subband, and thus the transmit self-interference signal of the transmit subband needs to be cancelled on the receive subband link. A related art technique to cancel the self-interference signal is by reducing the transmit power, but this solution reduces the coverage area of the base station, resulting in a significant reduction in its commercial value. Another related technology is realized by adding a subband filter, but the present subband filter scheme has the defect that the subband filter has larger volume, and the volume of the whole machine is increased to seriously influence the competitive index of the whole machine. Meanwhile, although the industry is also using a tunable filter, the tunable filter has the disadvantage that the tunable filter is mechanically tunable, the tuning speed is very slow, the mechanical tunable filter is tuned in the second(s) level, and the service switching speed is in the millisecond (ms) level, so the mechanical tunable filter cannot meet the requirement of future service switching. Both related art schemes severely restrict the development and commercial progress of sub-band duplexing techniques. Disclosure of Invention The disclosure provides a self-interference signal elimination method, a sub-band full duplex system and electronic equipment. In a first aspect, an embodiment of the present disclosure provides a self-interference signal cancellation method, where the method is applied to a sub-band full duplex system, the sub-band full duplex system includes a digital baseband signal processing unit, a transmitting unit, and a receiving unit, the digital baseband signal processing unit includes an auxiliary receiving link control and signal processing module and a digital cancellation module, the digital cancellation module is connected with the auxiliary receiving link control and signal processing module, the transmitting unit includes an auxiliary receiving link and a transmitting link, the auxiliary receiving link includes a linear cancellation module and a linear switch module, the linear cancellation module is connected with the linear switch module, and the linear switch module is connected with the auxiliary receiving link control and signal processing module, and the method includes: the linear cancellation module adjusts the attribute of the auxiliary receiving link to improve the signal-to-noise ratio of the auxiliary receiving link; After the attribute of the auxiliary receiving link is adjusted, the linear switch module switches the sub-band full duplex system to a self-interference channel offset mode based on the control of the auxiliary receiving link control and signal processing module; The linear switch module combines the input signal of the transmitting link processed by the auxiliary receiving link after attribute adjustment with the output signal of the transmitting link to obtain an auxiliary receiving link signal, and sends the auxiliary receiving link signal to the auxiliary receiving link control and signal processing module; The receiving unit sends a target signal to the digital cancellation module, and the auxiliary receiving link control and signal processing module instructs the digital cancellation module to cancel a self-interference signal in the target signal according to the auxiliary receiving link signal. In a second aspect, an embodiment of the disclosure provides a sub-band full duplex system, which comprises a digital baseband signal processing unit, a transmitting unit and