Method for Reducing Self-Interference Signal in Communications System, and Apparatus

Patent metadata

Field	Value
Publication number	US-2016277166-A1
Application number	US-201615167365-A
Country	US
Kind code	A1
Filing date	May 27, 2016
Priority date	Nov 29, 2013
Publication date	Sep 22, 2016
Grant date	—

Abstract

Embodiments provide a method for reducing a self-interference signal in a communications system, and an apparatus. The method includes: sending a sounding signal; receiving an echo signal, where the echo signal includes a near-field reflected signal corresponding to the sounding signal. The method also includes separating the near-field reflected signal corresponding to the sounding signal from the echo signal, and determining a near-field reflection channel parameter according to the near-field reflected signal. The method also includes determining a reconstructed near-field reflected self-interference signal based on the near-field reflection channel parameter, and and subtracting the reconstructed near-field reflected self-interference signal from a received second communication signal.

First claim

What is claimed is:

1 . An apparatus, wherein the apparatus comprises:
a sending unit, configured to send a sounding signal and a first communication signal, wherein the sounding signal is sent in a manner of being superimposed on the first communication signal, and a power used to send the sounding signal is less than a power used to send the first communication signal; a receiving unit, configured to receive an input signal, wherein the input signal comprises an echo signal and a second communication signal sent by another apparatus, and the echo signal comprises a near-field reflected signal corresponding to the sounding signal; a signal separation unit, configured to separate the near-field reflected signal from the echo signal; a processing unit for a near-field reflected self-interference signal, configured to determine a near-field reflection channel parameter according to the near-field reflected signal; and a cancellation unit for a near-field reflected self-interference signal, configured to determine a reconstructed near-field reflected self-interference signal based on the near-field reflection channel parameter, and subtract the reconstructed near-field reflected self-interference signal from the second communication signal.

2 . The apparatus according to claim 1 , wherein the sending unit is further configured to send the sounding signal in a transmit timeslot in a sounding timeslot, and to stop sending the sounding signal in an idle timeslot in the sounding timeslot, wherein the idle timeslot comprises a first silent timeslot and a second silent timeslot.

3 . The apparatus according to claim 1 , wherein the sending unit is further configured to send the sounding signal using a bandwidth that is greater than or equal to a bandwidth used to send the first communication signal.

4 . The apparatus according to claim 3 , wherein, in response to the sending unit sending the sounding signal by using a bandwidth that is greater than the bandwidth used to send the first communication signal, the processing unit for a near-field reflected self-interference signal is further configured to perform matched filtering on the near-field reflected signal, to obtain a filtered near-field reflected signal, and to determine the near-field reflection channel parameter according to the filtered near-field reflected signal.

5 . The apparatus according to claim 3 , wherein the sending unit sends the sounding signal by using a bandwidth that is greater than the bandwidth used to send the first communication signal; and
the processing unit for a near-field reflected self-interference signal is further configured to perform matched filtering on multiple near-field reflected signals, to obtain multiple filtered near-field reflected signals, determine an average value of the multiple filtered near-field reflected signals, and to determine the near-field reflection channel parameter according to the average value of the multiple filtered near-field reflected signals; or the processing unit for a near-field reflected self-interference signal is further configured to determine an average near-field reflected signal corresponding to multiple near-field reflected signals, perform matched filtering on the average near-field reflected signal, to obtain a filtered average near-field reflected signal, and to determine the near-field reflection channel parameter according to the filtered average near-field reflected signal.

6 . The apparatus according to claim 3 , wherein the sending unit sends the sounding signal using a bandwidth that is equal to the bandwidth used to send the first communication signal, and the processing unit for a near-field reflected self-interference signal is further configured to determine the near-field reflection channel parameter by using a super-resolution delay algorithm.

7 . The apparatus according to claim 1 , wherein the apparatus supports multiple-input multiple-output (MIMO), and the sending unit is further configured to separately send the sounding signal using multiple antennas of the apparatus, wherein timeslots in which the multiple antennas separately send the sounding signal are mutually staggered.

8 . The apparatus according to claim 1 , wherein the sending unit is further configured to send the sounding signal by using a timeslot that is staggered with a timeslot used for sending a sounding signal by an adjacent apparatus supporting wireless full duplex.

9 . The apparatus according to claim 1 , wherein the sending unit is further configured to send the sounding signal using M random sounding timeslots, wherein M is an average quantity of near-field reflected signals that correspond to the sounding signal and are accumulated by the apparatus supporting wireless full duplex within a coherent accumulation time for receiving the echo signal.

10 . An apparatus, wherein the apparatus comprises:
a transmit antenna, configured to send a sounding signal and a first communication signal, wherein the sounding signal is sent in a manner of being superimposed on the first communication signal, and a power used to send the sounding signal is less than a power used to send the first communication signal; a receive antenna, configured to receive an echo signal, wherein the echo signal comprises a near-field reflected signal corresponding to the sounding signal; a signal separator, configured to separate the near-field reflected signal from the echo signal; a processor for a near-field reflected self-interference signal, configured to determine a near-field reflection channel parameter according to the near-field reflected signal; and a canceller for a near-field reflected self-interference signal, configured to determine a reconstructed near-field reflected self-interference signal based on the near-field reflection channel parameter, and subtract the reconstructed near-field reflected self-interference signal from a second communication signal.

11 . The apparatus according to claim 10 , wherein the transmit antenna is further configured to send the sounding signal in a transmit timeslot in a sounding timeslot, and to stop sending the sounding signal in an idle timeslot in the sounding timeslot, wherein the idle timeslot comprises a first silent timeslot and a second silent timeslot.

12 . The apparatus according to claim 10 , wherein the transmit antenna is specifically configured to send the sounding signal using a bandwidth that is greater than or equal to a bandwidth used to send the first communication signal.

13 . The apparatus according to claim 12 , wherein the transmit antenna sends the sounding signal by using a bandwidth that is greater than the bandwidth used to send the first communication signal, and the processor for a near-field reflected self-interference signal is configured to perform matched filtering on the near-field reflected signal, to obtain a filtered near-field reflected signal, and to determine the near-field reflection channel parameter according to the filtered near-field reflected signal.

14 . The apparatus according to claim 12 , wherein the transmit antenna sends the sounding signal using a bandwidth that is greater than the bandwidth used to send the first communication signal; and
the processor for a near-field reflected self-interference signal is further configured to perform matched filtering on multiple near-field reflected signals, to obtain multiple filtered near-field reflected signals, determine an average value of the multiple filtered near-field reflected signals, and to determine the near-field reflection channel parameter according to the average value of the multi

Assignees

• Huawei Tech Co Ltd

Inventors

• Liu Sheng

Classifications

• H04L25/03006 Primary

  Arrangements for removing intersymbol interference · CPC title

• H04L5/0048 Primary

  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

• H04W4/008

  Electricity · mapped topic

• H04W72/0446

  Resources in time domain, e.g. slots or frames · CPC title

• H04B1/525 Primary

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