Self-interference cancellation method, transceiver, and communications device for transmit/receive shared antenna

Patent metadata

Field	Value
Publication number	US-2016285502-A1
Application number	US-201615172895-A
Country	US
Kind code	A1
Filing date	Jun 3, 2016
Priority date	Dec 4, 2013
Publication date	Sep 29, 2016
Grant date	—

Abstract

Embodiments of the present invention provide a self-interference cancellation method, a transceiver, and a communications device for a transmit/receive shared antenna. The method includes: in a self-interference channel measurement timeslot, transmitting a first reference signal on a transmit channel, and receiving a second reference signal on a reference signal receive channel, where the second reference signal is a reference signal obtained after the first reference signal passes through a self-interference signal transmission path; and performing channel estimation according to the first reference signal and the second reference signal to obtain description information of the self-interference transmission path.

First claim

What is claimed is:

1 . A self-interference cancellation method for a transmit/receive shared antenna, comprising:
in a self-interference channel measurement timeslot, transmitting a first reference signal on a transmit channel, and receiving a second reference signal on a reference signal receive channel, wherein the second reference signal is a reference signal obtained after the first reference signal passes through a self-interference transmission path; performing channel estimation according to the first reference signal and the second reference signal to obtain description information of the self-interference transmission path; in a data transceiving timeslot, transmitting a first communication signal on the transmit channel, and receiving a second communication signal on a communication signal receive channel, wherein the first communication signal is a signal transmitted by using the transmit/receive shared antenna, and the second communication signal is a signal received by using the transmit/receive shared antenna; and obtaining a self-interference signal according to the first communication signal and the description information of the self-interference transmission path, and performing self-interference cancellation on the second communication signal by using the self-interference signal.

2 . The method according to claim 1 , wherein:
transmitting a first reference signal on a transmit channel comprises:
performing, on the transmit channel, digital-to-analog conversion, up-conversion processing, and power amplification processing on the first reference signal transmitted by a baseband unit, and transmitting the processed first reference signal to the transmit/receive shared antenna by using a transmit/receive isolator;
receiving a second reference signal on a reference signal receive channel comprises:
receiving, on the reference signal receive channel, the second reference signal transferred by the transmit/receive isolator, wherein the second reference signal comprises a signal obtained after the first reference signal is reflected by the transmit/receive shared antenna, and an interference signal obtained after the first reference signal is leaked from the transmit channel to the reference signal receive channel through the transmit/receive isolator; and performing down-conversion and analog-to-digital conversion processing on the second reference signal; and
performing channel estimation according to the first reference signal and the second reference signal to obtain description information of the self-interference transmission path comprises:
performing channel estimation according to the first reference signal transmitted by the baseband unit and the second reference signal obtained after analog-to-digital conversion processing, so as to obtain the description information of the self-interference transmission path.

3 . The method according to claim 2 , wherein:
transmitting a first communication signal on the transmit channel comprises:
performing, on the transmit channel, digital-to-analog conversion, up-conversion processing, and power amplification processing on the first communication signal transmitted by the baseband unit, and transmitting the processed first communication signal to the transmit/receive shared antenna by using the transmit/receive isolator;
receiving a second communication signal on a communication signal receive channel comprises:
receiving, on the communication signal receive channel, the second communication signal transferred by the transmit/receive isolator; and
obtaining a self-interference signal according to the first communication signal and the description information of the self-interference transmission path, and performing self-interference cancellation on the second communication signal by using the self-interference signal comprises:
obtaining the self-interference signal according to the first communication signal transmitted by the baseband unit and the description information of the self-interference transmission path,
performing digital-to-analog conversion and up-conversion processing on the self-interference signal to obtain the processed self-interference signal, and
performing combination processing on the processed self-interference signal and the second communication signal to obtain a self-interference-canceled second communication signal.

4 . The method according to claim 1 , wherein:
transmitting a first reference signal on a transmit channel comprises:
performing, on the transmit channel, digital-to-analog conversion, up-conversion processing, and power amplification processing on a baseband reference signal transmitted by a baseband unit, so as to obtain the first reference signal, and transmitting the first reference signal to the transmit/receive shared antenna by using a transmit/receive isolator;
receiving a second reference signal on a reference signal receive channel comprises:
receiving, on the reference signal receive channel, the second reference signal transferred by the transmit/receive isolator, wherein the second reference signal comprises a signal obtained after the first reference signal is reflected by the transmit/receive shared antenna, and an interference signal obtained after the first reference signal is leaked from the transmit channel to the reference signal receive channel through the transmit/receive isolator; and performing down-conversion and analog-to-digital conversion processing on the second reference signal; and
performing channel estimation according to the first reference signal and the second reference signal to obtain description information of the self-interference transmission path, comprises:
performing down-conversion processing and analog-to-digital conversion on the first reference signal to obtain the baseband reference signal, and
performing channel estimation according to the baseband reference signal and the second reference signal obtained after analog-to-digital conversion processing, so as to obtain the description information of the self-interference transmission path.

5 . The method according to claim 4 , wherein:
transmitting a first communication signal on the transmit channel comprises:
performing, on the transmit channel, digital-to-analog conversion, up-conversion processing, and power amplification processing on a baseband communication signal transmitted by the baseband unit to obtain the first communication signal, and transmitting the first communication signal to the transmit/receive shared antenna by using the transmit/receive isolator;
receiving a second communication signal on a communication signal receive channel comprises:
receiving, on the communication signal receive channel, the second communication signal transferred by the transmit/receive isolator; and
obtaining a self-interference signal according to the first communication signal and the description information of the self-interference transmission path, and performing self-interference cancellation on the second communication signal by using the self-interference signal comprises:
performing down-conversion processing and analog-to-digital conversion on the first communication signal to obtain the baseband communication signal,
obtaining the self-interference signal according to the baseband communication signal and the description information of the self-interference transmission path,
performing digital-to-analog conversion and up-conversion processing on the self-interference signal to obtain the processed self-interference signal, and
performing combination processing on the processed self-interference signal and the second communication signal to obtain a self-interference-canceled second communication signal.

6 . A transceiver for a tra

Assignees

• Huawei Tech Co Ltd

Inventors

• Liu Sheng

Classifications

• H04L25/0224

  using sounding signals · CPC title

• H04B1/44 Primary

  Transmit/receive switching · CPC title

• H04B15/00

  Suppression or limitation of noise or interference (by means associated with receiver H04B1/10) · CPC title

• H04B1/525 Primary

  with means for reducing leakage of transmitter signal into the receiver · CPC title

• H04L5/1461

  Suppression of signals in the return path, i.e. bidirectional control circuits · CPC title