Interference cancellation apparatus and method

• US 9,973,233 B2
• Filed: 09/07/2016
• Issued: 05/15/2018
• Est. Priority Date: 03/07/2014
• Status: Active Grant

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: Liu, Sheng
• Primary Examiner(s): Fan, Chieh M
• Assistant Examiner(s): Tadese, Berhanu
• Application Number:
  US15/258,869
• Publication Number:
  US 20160380669A1
• Time in Patent Office: 615 Days
• CPC Class Codes: H04B 1/525 with means for reducing leakage of transmitter signal into the receiver
• CPC Class Codes: H04B 7/04 using two or more spaced independent antennas
• CPC Class Codes: H04B 7/0404 the mobile station comprising multiple antennas, e.g. to provide uplink diversity
• CPC Class Codes: H04L 27/34 Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
• CPC Class Codes: H04L 5/14 Two-way operation using the same type of signal, i.e. duplex

Abstract

Embodiments of the present invention provide an interference cancellation apparatus. The apparatus includes: a splitter, configured to send an acquired reference signal to a first and second main-path interference canceller; a main receive antenna, configured to send an acquired first receive signal to the first main-path interference canceller; the first main-path interference canceller, configured to perform first main-path interference cancellation processing on the first receive signal according to the reference signal, to generate a first processing signal; a reference receive antenna, configured to acquire and send a second receive signal to the second main-path interference canceller; the second main-path interference canceller, configured to perform second main-path interference cancellation processing on the second receive signal according to the reference signal, to generate a second processing signal; and a near-field interference canceller, configured to perform near-field interference cancellation processing on the first processing signal according to the second processing signal.

Claims

1. An interference cancellation apparatus, wherein the apparatus comprises:

a splitter configured to;

acquire a reference signal according to a transmit signal, and

send the reference signal to a first main-path interference canceller and a second main-path interference canceller;

a main receive antenna configured to;

receive a first receive signal, and

send the first receive signal to the first main-path interference canceller;

the first main-path interference canceller configured to;

perform amplitude adjustment processing and phase adjustment processing on the reference signal based on the first receive signal, so that amplitude of the reference signal is contrary to or approximately contrary to amplitude of a main-path interference signal in the first receive signal, and a phase of the reference signal is the same as or approximately the same as a phase of the main-path interference signal in the first receive signal,

combine the first receive signal and a reference signal that is obtained after the amplitude adjustment processing and the phase adjustment processing,

generate a first processing signal, and

send the first processing signal to a near-field interference canceller;

a reference receive antenna configured to;

receive a second receive signal, and

send the second receive signal to the second main-path interference canceller;

the second main-path interference canceller configured to;

perform second main-path interference cancellation processing on the second receive signal according to the reference signal,

generate a second processing signal, and

send the second processing signal to the near-field interference canceller; and

the near-field interference canceller configured to;

perform near-field interference cancellation processing on the first processing signal according to the second processing signal.

2. The apparatus according to claim 1, wherein the main receive antenna and the reference receive antenna are configured in parallel.

3. The apparatus according to claim 2, wherein a distance between the main receive antenna and the reference receive antenna is less than or equal to a first preset value, and the first preset value is determined according to a wavelength of the transmit signal.

4. The apparatus according to claim 1, wherein the second main-path interference canceller is configured to:

perform amplitude adjustment processing and phase adjustment processing on the reference signal based on the second receive signal, so that the amplitude of the reference signal is contrary to or approximately contrary to amplitude of a main-path interference signal in the second receive signal, and the phase of the reference signal is the same as or approximately the same as a phase of the main-path interference signal in the second receive signal, or

perform amplitude adjustment processing and phase adjustment processing on the reference signal based on the second receive signal, so that the amplitude of the reference signal is the same as or approximately the same as amplitude of a main-path interference signal in the second receive signal, and a difference between the phase of the reference signal and a phase of the main-path interference signal in the second receive signal is 180°

or approximately 180°

; and

combine the second receive signal and a reference signal that is obtained after the amplitude adjustment processing and the phase adjustment processing.

5. The apparatus according to claim 1, wherein the near-field interference canceller comprises:

a first amplitude adjuster, configured to adjust amplitude of the second processing signal based on the first processing signal;

a first phase adjuster, configured to adjust a phase of the second processing signal based on the first processing signal; and

a combiner, configured to combine the first processing signal and a second processing signal that has been processed by the first amplitude adjuster and the first phase adjuster.

6. The apparatus according to claim 5, wherein:

the first amplitude adjuster is configured to;

adjust the amplitude of the second processing signal based on the first processing signal, so that the amplitude of the second processing signal is contrary to or approximately contrary to amplitude of a first near-field interference signal in the first processing signal, and

the first phase adjuster is configured to;

adjust the phase of the second processing signal based on the first processing signal, so that the phase of the second processing signal is the same as or approximately the same as a phase of the first near-field interference signal in the first processing signal;

or

the first amplitude adjuster is configured to;

adjust the amplitude of the second processing signal based on the first processing signal, so that the amplitude of the second processing signal is the same as or approximately the same as amplitude of a first near-field interference signal in the first processing signal, and

the first phase adjuster is configured to;

adjust the phase of the second processing signal based on the first processing signal, so that a difference between the phase of the second processing signal and a phase of the first near-field interference signal in the first processing signal is 180°

or approximately 180°

.

7. The apparatus according to claim 5, wherein the near-field interference canceller further comprises:

a delayer group, comprising at least one delayer, wherein the at least one delayer is connected in series, and the delayer group is configured to acquire the second processing signal, and sequentially perform delay processing on the second processing signal by using each delayer,

an amplitude adjuster group, comprising at least one second amplitude adjuster, wherein the at least one second amplitude adjuster is in a one-to-one correspondence with the at least one delayer, and the second amplitude adjuster is configured to adjust, based on the first processing signal, amplitude of a second processing signal that is obtained after delay processing and that is output from a corresponding delayer; and

a phase adjuster group, comprising at least one second phase adjuster, wherein the at least one second phase adjuster is in a one-to-one correspondence with the at least one delayer, and the second phase adjuster is configured to adjust, based on the first processing signal, a phase of the second processing signal that is obtained after delay processing and that is output from the corresponding delayer;

wherein the combiner is configured to combine the first processing signal and a processing signal that is obtained after the second processing signal that has been processed by the first amplitude adjuster and the first phase adjuster and a second processing signal that has been processed by the amplitude adjuster group and the phase adjuster group are combined.

8. The apparatus according to claim 7, wherein:

the second amplitude adjuster is configured to;

adjust, based on the first processing signal, the amplitude of the second processing signal that is obtained after delay processing and that is output from the corresponding delayer, so that the amplitude of the second processing signal is contrary to or approximately contrary to amplitude of a second near-field interference signal in the first processing signal; and

the second phase adjuster is configured to;

adjust, based on the first processing signal, the phase of the second processing signal that is obtained after delay processing and that is output from the corresponding delayer, so that the phase of the second processing signal is the same as or approximately the same as a phase of the second near-field interference signal in the first processing signal.

9. The apparatus according to claim 7, wherein:

the second amplitude adjuster is configured to;

adjust, based on the first processing signal, the amplitude of the second processing signal that is obtained after delay processing and that is output from the corresponding delayer, so that the amplitude of the second processing signal is the same as or approximately the same as amplitude of a second near-field interference signal in the first processing signal; and

the second phase adjuster is configured to;

adjust, based on the first processing signal, the phase of the second processing signal that is obtained after delay processing and that is output from the corresponding delayer, so that a difference between the phase of the second processing signal and a phase of the second near-field interference signal in the first processing signal is 180°

or approximately 180°

.

10. An interference cancellation method, wherein the method is performed in a device comprising a main receive antenna and at least one reference receive antenna, the method comprising:

acquiring a reference signal according to a transmit signal;

acquiring a first receive signal using the main receive antenna;

performing amplitude adjustment processing and phase adjustment processing on the reference signal based on the first receive signal, so that amplitude of the reference signal is contrary to or approximately contrary to amplitude of a main-path interference signal in the first receive signal, and a phase of the reference signal is the same as or approximately the same as a phase of the main-path interference signal in the first receive signal;

generating a first processing signal;

acquiring a second receive signal using the reference receive antenna;

performing second main-path interference cancellation processing on the second receive signal, according to the reference signal, to generate a second processing signal; and

performing near-field interference cancellation processing on the first processing signal according to the second processing signal.

11. The method according to claim 10, wherein the main receive antenna and the reference receive antenna are configured in parallel.

12. The method according to claim 11, wherein a distance between the main receive antenna and the reference receive antenna is less than or equal to a first preset value, and the first preset value is determined according to a wavelength of the transmit signal.

13. The method according to claim 10, wherein performing the second main-path interference cancellation processing on the second receive signal according to the reference signal comprises:

performing amplitude adjustment processing and phase adjustment processing on the reference signal based on the second receive signal, so that the amplitude of the reference signal is contrary to or approximately contrary to amplitude of a main-path interference signal in the second receive signal, and the phase of the reference signal is the same as or approximately the same as a phase of the main-path interference signal in the second receive signal, or

performing amplitude adjustment processing and phase adjustment processing on the reference signal based on the second receive signal, so that the amplitude of the reference signal is the same as or approximately the same as amplitude of a main-path interference signal in the second receive signal, and a difference between the phase of the reference signal and a phase of a main-path interference signal in the second receive signal is 180°

or approximately 180°

.

14. The method according to claim 10, wherein performing the near-field interference cancellation processing on the first processing signal according to the second processing signal comprises:

performing amplitude adjustment processing and phase adjustment processing on the second processing signal based on the first processing signal; and

combining the first processing signal and a second processing signal that is obtained after the amplitude adjustment processing and the phase adjustment processing.

15. The method according to claim 14, wherein performing the amplitude adjustment processing and phase adjustment processing on the second processing signal based on the first processing signal comprises:

adjusting amplitude of the second processing signal based on the first processing signal, so that the amplitude of the second processing signal is contrary to or approximately contrary to amplitude of a first near-field interference signal in the first processing signal, and

adjusting a phase of the second processing signal based on the first processing signal, so that the phase of the second processing signal is the same as or approximately the same as a phase of the first near-field interference signal in the first processing signal;

or

adjusting amplitude of the second processing signal based on the first processing signal, so that the amplitude of the second processing signal is the same as or approximately the same as amplitude of a first near-field interference signal in the first processing signal, and

adjusting a phase of the second processing signal based on the first processing signal, so that a difference between the phase of the second processing signal and a phase of the first near-field interference signal in the first processing signal is 180°

or approximately 180°

.

16. The method according to claim 14, wherein performing the near-field interference cancellation processing on the first processing signal according to the second processing signal comprises:

performing amplitude adjustment processing and phase adjustment processing on the second processing signal based on the first processing signal, to generate a third processing signal;

performing delay processing on the second processing signal at least once, to generate at least one fourth processing signal;

separately performing amplitude adjustment processing and phase adjustment processing on the at least one fourth processing signal based on the first processing signal, to generate at least one fifth processing signal, wherein the at least one fourth processing signal is in a one-to-one correspondence with the at least one fifth processing signal; and

combining the at least one fifth processing signal, the third processing signal, and the first processing signal.

17. The method according to claim 16, wherein separately performing the amplitude adjustment processing and phase adjustment processing on the at least one fourth processing signal based on the first processing signal comprises:

adjusting amplitude of the fourth processing signal based on the first processing signal, so that the amplitude of the fourth processing signal is contrary to or approximately contrary to amplitude of a second near-field interference signal in the first processing signal; and

adjusting a phase of the fourth processing signal based on the first processing signal, so that the phase of the second processing signal is the same as or approximately the same as a phase of the second near-field interference signal in the first processing signal.

18. The method according to claim 16, wherein separately performing the amplitude adjustment processing and phase adjustment processing on the at least one fourth processing signal based on the first processing signal comprises:

adjusting amplitude of the fourth processing signal based on the first processing signal, so that the amplitude of the second processing signal is the same as or approximately the same as amplitude of a second near-field interference signal in the first processing signal; and

adjusting a phase of the fourth processing signal based on the first processing signal, so that a difference between the phase of the second processing signal and a phase of the second near-field interference signal in the first processing signal is 180°

or approximately 180°

.