Method for estimating response of baseband self-interference channel and apparatus

• US 10,044,531 B2
• Filed: 10/24/2016
• Issued: 08/07/2018
• Est. Priority Date: 04/25/2014
• 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: Cheng, Hong, Chen, Teyan, Liu, Sheng
• Primary Examiner(s): CHO, HONG SOL
• Application Number:
  US15/332,483
• Publication Number:
  US 20170041165A1
• Time in Patent Office: 652 Days
• Field of Search: None
• CPC Class Codes: H04B 1/123 using adaptive balancing or compensation means adaptive filter circuits and algorithms H03H
• CPC Class Codes: H04B 15/02 Reducing interference from electric apparatus by means located at or near the interfering apparatus
• CPC Class Codes: H04L 1/00 Arrangements for detecting or preventing errors in the information received correcting synchronisation H04L7/00
• CPC Class Codes: H04L 25/03159 operating in the frequency domain H04L25/03165, H04L25/03178 take precedence
• CPC Class Codes: H04L 27/2601 Multicarrier modulation systems
• CPC Class Codes: H04L 47/29 using a combination of thresholds
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/14 Two-way operation using the same type of signal, i.e. duplex
• CPC Class Codes: H04L 5/1461 Suppression of signals in the return path, i.e. bidirectional control circuits

Abstract

The embodiments of present disclosure provide a method for estimating a response of a baseband self-interference channel and an apparatus, where the method includes: estimating a response of a baseband self-interference channel to obtain a first estimation response of the baseband self-interference channel; starting to perform first full duplex communication; canceling baseband self-interference in a first baseband received signal according to the first estimation response, where the first baseband received signal is a baseband signal received during the first full duplex communication; determining a first parameter of the baseband self-interference channel; determining an estimation policy of the baseband self-interference channel according to the first parameter; and estimating the response of the baseband self-interference channel according to the estimation policy.

Claims

1. A method for estimating a response of a baseband self-interference channel, wherein the method comprises:

estimating a response of a baseband self-interference channel to obtain a first estimation response of the baseband self-interference channel;

starting to perform first full duplex communication;

canceling baseband self-interference in a first baseband received signal according to the first estimation response, wherein the first baseband received signal is a baseband signal received during the first full duplex communication;

determining a first parameter of the baseband self-interference channel, wherein the first parameter is related to residual interference of the baseband self-interference channel;

determining an estimation policy of the baseband self-interference channel according to the first parameter; and

estimating the response of the baseband self-interference channel according to the estimation policy.

2. The method according to claim 1, wherein the first baseband received signal comprises a first baseband received signal at a first time point and a first baseband received signal at a second time point;

and

the determining the first parameter of the baseband self-interference channel comprises;

determining a baseband signal transmitted at the first time point and a processed signal at the first time point, wherein the processed signal at the first time point is the first baseband received signal, at the first time point, in which the baseband self-interference is canceled;

determining a baseband signal transmitted at the second time point and a processed signal at the second time point, wherein the processed signal at the second time point is the first baseband received signal, at the second time point, in which the baseband self-interference is canceled; and

determining the first parameter according to the baseband signal transmitted at the first time point, the processed signal at the first time point, the baseband signal transmitted at the second time point, and the processed signal at the second time point, wherein the first parameter is in direct proportion to power of the residual interference of the baseband self-interference channel.

3. The method according to claim 2, wherein the determining the first parameter according to the baseband signal transmitted at the first time point, the processed signal at the first time point, the baseband signal transmitted at the second time point, and the processed signal at the second time point comprises:

determining the first parameter according to the following formula;

4. The method according to claim 2, wherein the first time point is a time point for starting to perform the first full duplex communication, and the second time point is a time point at which a decreased value of channel quality of the first full duplex communication is less than a second preset threshold.

5. The method according to claim 1, wherein the determining the estimation policy of the baseband self-interference channel according to the first parameter comprises:

when the first parameter is greater than a first preset threshold, determining to stop performing the first full duplex communication and re-start to estimate the response of the baseband self-interference channel.

6. The method according to claim 1, wherein the estimating the response of the baseband self-interference channel to obtain the first estimation response of the baseband self-interference channel comprises:

estimating the response of the baseband self-interference channel by using a baseband estimation signal with a first frequency domain density; and

the determining the estimation policy of the baseband self-interference channel according to the first parameter comprises;

when the first parameter is greater than a third preset threshold, determining that the estimation policy of the baseband self-interference channel is estimating the response of the baseband self-interference channel by using a baseband estimation signal with a second frequency domain density, wherein the second frequency domain density is greater than the first frequency domain density; and

when the first parameter is less than a third preset threshold, determining that the estimation policy of the baseband self-interference channel is estimating the response of the baseband self-interference channel by using the baseband estimation signal with the first frequency domain density.

7. The method according to claim 6, wherein when the first parameter is greater than the third preset threshold, determining that the estimation policy of the baseband self-interference channel is estimating the response of the baseband self-interference channel by using the baseband estimation signal with the second frequency domain density, the estimating the response of the baseband self-interference channel according to the estimation policy comprises:

estimating, by using the baseband estimation signal with the second frequency domain density, the response of the baseband self-interference channel to obtain a second estimation response;

starting to perform second full duplex communication;

canceling baseband self-interference in a second baseband received signal according to the second estimation response, wherein the second baseband received signal is a baseband signal received during the second full duplex communication;

determining power of second residual interference; and

when the power of the second residual interference is less than the third preset threshold, determining to keep the second frequency domain density of the baseband estimation signal unchanged; and

when the power of the second residual interference is greater than the third preset threshold, determining a second parameter according to the power of the second residual interference and the power of the first residual interference, and determining, according to the second parameter, whether to increase the second frequency domain density of the baseband estimation signal.

8. The method according to claim 7, wherein the determining the second parameter according to the power of the second residual interference and the power of the first residual interference comprises:

determining the second parameter by using the following formula;

R₂=P₁−

P₂,

wherein R₂ is the second parameter, P₁ is the power of the first residual interference, and P₂ is the power of the second residual interference.

9. The method according to claim 7, wherein the determining, according to the second parameter, whether to increase the second frequency domain density of the baseband estimation signal comprises:

when the second parameter is greater than a fourth preset threshold, determining to increase the second frequency domain density of the baseband estimation signal;

when the second parameter is less than a fourth preset threshold, determining to keep the second frequency domain density of the baseband estimation signal unchanged.

10. The method according to claim 1, wherein the determining the first parameter of the baseband self-interference channel comprises:

determining power of first residual interference; and

determining the first parameter as the power of the first residual interference.

11. An apparatus, wherein the apparatus comprises:

a processor, configured to estimate a response of a baseband self-interference channel to obtain a first estimation response of the baseband self-interference channel; and

a transceiver, configured to perform first full duplex communication,

wherein the processor is further configured to;

cancel baseband self-interference in a first baseband received signal according to the first estimation response, wherein the first baseband received signal is a baseband signal received by the transceiver during the first full duplex communication;

determine a first parameter of the baseband self-interference channel, wherein the first parameter is related to power of residual interference of the baseband self-interference channel;

determine an estimation policy of the baseband self-interference channel according to the first parameter; and

estimate the response of the baseband self-interference channel according to the estimation policy.

12. The apparatus according to claim 11, wherein:

the processor is configured to;

determine a baseband signal transmitted at a first time point and a processed signal at the first time point, wherein the processed signal at the first time point is a first baseband received signal, at the first time point, in which the baseband self-interference is canceled;

determine a baseband signal transmitted at a second time point and a processed signal at the second time point, wherein the processed signal at the second time point is a first baseband received signal, at the second time point, in which the baseband self-interference is canceled; and

determine the first parameter according to the baseband signal transmitted at the first time point, the processed signal at the first time point, the baseband signal transmitted at the second time point, and the processed signal at the second time point, wherein the first parameter is in direct proportion to the power of the residual interference of the baseband self-interference channel.

13. The apparatus according to claim 12, wherein the processor is configured to determine the first parameter according to the following formula:

14. The apparatus according to claim 11, wherein the processor is configured to:

when the first parameter is greater than a first preset threshold, determine to stop performing the first full duplex communication and re-start to estimate the response of the baseband self-interference channel.

15. The apparatus according to claim 11, wherein:

the processor is configured to

estimate the response of the baseband self-interference channel by using a baseband estimation signal with a first frequency domain density; and

when the first parameter is greater than a third preset threshold, determine that the estimation policy of the baseband self-interference channel is estimating the response of the baseband self-interference channel by using a baseband estimation signal with a second frequency domain density, wherein the second frequency domain density is greater than the first frequency domain density; and

when the first parameter is less than the third preset threshold, determine that the estimation policy of the baseband self-interference channel is estimating the response of the baseband self-interference channel by using the baseband estimation signal with the first frequency domain density.

16. The apparatus according to claim 15, wherein:

the processor is further configured to estimate, by using the baseband estimation signal with the second frequency domain density, the response of the baseband self-interference channel to obtain a second estimation response;

the transceiver is further configured to start second full duplex communication;

the processor is further configured to;

cancel baseband self-interference in a second baseband received signal according to the second estimation response, wherein the second baseband received signal is a baseband signal received during the second full duplex communication;

determine power of second residual interference; and

when the power of the second residual interference is less than the third preset threshold, determine to keep the second frequency domain density of the baseband estimation signal unchanged; and

when the power of the second residual interference is greater than the third preset threshold, determine a second parameter according to the power of the second residual interference and the power of the first residual interference, and determine, according to the second parameter, whether to increase the second frequency domain density of the baseband estimation signal.

17. The apparatus according to claim 16, wherein the processor is configured to determine the second parameter by using the following formula:

R₂=P₁−

P₂,

wherein R₂ is the second parameter, P₁ is the power of the first residual interference, and P₂ is the power of the second residual interference.

18. The apparatus according to claim 17, wherein the processor is configured to:

when the second parameter is greater than a fourth preset threshold, determine to increase the second frequency domain density of the baseband estimation signal; and

when the second parameter is less than the fourth preset threshold, determine to estimate the response of the baseband self-interference channel by using the baseband estimation signal with the first frequency domain density.

19. The apparatus according to claim 11, wherein the processor is configured to:

determine power of first residual interference, and determine the first parameter as the power of the first residual interference.

20. A method for estimating a response of a baseband self-interference channel, comprising:

determining an initial estimation response of the baseband self-interference channel;

receiving a baseband signal during a first full duplex communication;

canceling baseband self-interference in the received baseband signal according to the initial estimation response;

determining a parameter that is indicative of residual interference of the baseband self-interference channel;

determining an estimation policy of the baseband self-interference channel according to the parameter; and

determining the response of the baseband self-interference channel following the estimation policy.