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

Patent metadata

Field	Value
Publication number	US-10044531-B2
Application number	US-201615332483-A
Country	US
Kind code	B2
Filing date	Oct 24, 2016
Priority date	Apr 25, 2014
Publication date	Aug 7, 2018
Grant date	Aug 7, 2018

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.

First claim

What is claimed is:

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:

R
1

=

∑

n
=
1

N

⁢

x
2

⁡

(
n
)

⁢

y
2
′

⁡

(
n
)

-

∑

n
=
1

N

⁢

x
1

⁡

(
n
)

⁢

y
1
′

⁡

(
n
)

,

wherein R 1 is the first parameter, x 1 (n) is the baseband signal transmitted at the first time point, y′ 1 (n) is the processed signal at the first time point, x 2 (n) is the baseband signal transmitted at the second time point, and y′ 2 (n) is the processed signal at the second time point.

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;
sta

Assignees

• Huawei Tech Co Ltd

Inventors

• Cheng Hong
• Chen Teyan
• Liu Sheng

Classifications

• H04L5/0007

  the frequencies being orthogonal, e.g. OFDM(A) or DMT · CPC title

• H04B15/02

  Reducing interference from electric apparatus by means located at or near the interfering apparatus · CPC title

• H04L47/29

  using a combination of thresholds · CPC title

• H04L27/2601

  Multicarrier modulation systems · CPC title

• H04L5/0048

  Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091) · CPC title