Full-duplex communication apparatus and method

Patent metadata

Field	Value
Publication number	US-9602268-B2
Application number	US-201414260912-A
Country	US
Kind code	B2
Filing date	Apr 24, 2014
Priority date	Oct 28, 2011
Publication date	Mar 21, 2017
Grant date	Mar 21, 2017

Abstract

An embodiment of the present invention discloses a full-duplex communication apparatus, including at least one transmit antenna and at least one signal synthesizing apparatus, where the signal synthesizing apparatus is connected to at least two receive antennas, the at least one transmit antenna is configured to transmit a first transmit signal, the at least two receive antennas are configured to separately receive the first transmit signal, and the signal synthesizing apparatus is configured to receive the first transmit signal from the at least two receive antennas, where a phase difference exists between the received first transmit signals, and synthesize the received first transmit signals, where strength of the synthesized first transmit signal is lower than strength of at least one of the first transmit signals received by the signal synthesizing apparatus.

First claim

What is claimed is:

1. A full-duplex communication apparatus, comprising at least one transmit antenna and at least one signal synthesizing apparatus, wherein the signal synthesizing apparatus is connected to at least two receive antennas, and
the at least one transmit antenna is configured to transmit a first transmit signal;
the at least two receive antennas are configured to separately receive the first transmit signal as received first transmit signals; and
the signal synthesizing apparatus is configured to receive the received first transmit signals from the at least two receive antennas, wherein a phase difference exists between the received first transmit signals, and synthesize the received first transmit signals, wherein a strength of a resulting synthesized first transmit signal is lower than a strength of at least one of the received first transmit signals received by the signal synthesizing apparatus, wherein:
the at least two receive antennas are further configured to separately receive a first receive signal as received first receive signals,
the signal synthesizing apparatus is further configured to receive the first receive signals from the at least two receive antennas and synthesize the received first receive signals, wherein a strength of a resulting synthesized first receive signal is higher than a strength of any one of the first receive signals received by the signal synthesizing apparatus, and
wherein the at least one signal synthesizing apparatus specifically comprises at least two signal synthesizing apparatuses, and the full-duplex communication apparatus further comprises a second signal synthesizing apparatus, wherein the second signal synthesizing apparatus is connected to the at least two signal synthesizing apparatuses, and the second signal synthesizing apparatus is configured to receive residual first transmit signals from the at least two signal synthesizing apparatus and synthesize the received residual first transmit signals, wherein strength of the synthesized first transmit signal is lower than strength of at least one of the residual first transmit signals received by the second signal synthesizing apparatus.

2. The full-duplex communication apparatus according to claim 1 , wherein a phase shift apparatus is further comprised between the signal synthesizing apparatus and at least one receive antenna, and the phase shift apparatus is configured to adjust a phase of the first transmit signal from the at least one receive antenna, so that the strength of the resulting synthesized first transmit signal is reduced.

3. The full-duplex communication apparatus according to claim 1 , wherein the strength of the resulting synthesized first transmit signal is zero.

4. The full-duplex communication apparatus according to claim 1 , wherein the at least two receive antennas specifically comprises a first receive antenna and a second receive antenna, and the signal synthesizing apparatus is configured to receive the first transmit signal from the first receive antenna and the first transmit signal from the second receive antenna, wherein a phase difference between the first transmit signal from the first receive antenna and the first transmit signal from the second receive antenna is greater than 5π/6 and less than 7π/6.

5. The full-duplex communication apparatus according to claim 4 , wherein the maximum wavelength of transmit signal that is supported by the at least one transmit antenna is λ 1 , the supported minimum wavelength of the transmit signal is λ 2 , a distance difference x exists between distances from the first receive antenna and the second receive antenna to a beam center of the first transmit signal, and

λ
2

2

≤
x
≤

λ
1

2

.

6. The full-duplex communication apparatus according to claim 1 , wherein the second signal synthesizing apparatus is further configured to receive a first receive signal from the at least two signal synthesizing apparatuses and synthesize the received first receive signals, wherein strength of the synthesized first receive signal is higher than strength of any one of the first receive signals received by the second signal synthesizing apparatus.

7. The full-duplex communication apparatus according to claim 1 , wherein a first phase shift apparatus is further comprised between the second signal synthesizing apparatus and at least one signal synthesizing apparatus, and the first phase shift apparatus is configured to perform a phase shift on the residual first transmit signals from the at least one signal synthesizing apparatus.

8. The full-duplex communication apparatus according to claim 1 , wherein the transmit antenna and the receive antenna are feed antennas.

9. A full-duplex communication method, comprising:
transmitting, by at least one transmit antenna, a first transmit signal;
separately receiving, by at least two receive antennas, the first transmit signal as received first transmit signals;
receiving, by a signal synthesizing apparatus, the received first transmit signals from the at least two receive antennas, wherein a phase difference exists between the received first transmit signals, and synthesizing the received first transmit signals, wherein a strength of a resulting synthesized first transmit signal is lower than a strength of at least one of the received first transmit signals received by the signal synthesizing apparatus;
further separately receiving, by the at least two receive antennas, a first receive signal as received first receive signals when separately receiving the first transmit signal; and
receiving, by the signal synthesizing apparatus, the first receive signals from the at least two receive antennas and synthesizing the received first receive signals, wherein a strength of a resulting synthesized first receive signal is higher than a strength of any one of the first receive signals received by the signal synthesizing apparatus,
wherein the at least one signal synthesizing apparatus specifically comprises at least two signal synthesizing apparatuses, and a second signal synthesizing apparatus that is connected to the at least two signal synthesizing apparatuses receives residual first transmit signals from the at least two signal synthesizing apparatuses and synthesizes the received residual first transmit signals, wherein strength of the synthesized first transmit signal is lower than strength of at least one of the residual first transmit signals received by the second signal synthesizing apparatus.

10. The full-duplex communication method according to claim 9 , further comprising:
adjusting, by a phase shift apparatus between the signal synthesizing apparatus and at least one receive antenna, a phase of first transmit signal from the at least one receive antenna, so that the strength of the resulting synthesized first transmit signal after being synthesized by the signal synthesizing apparatus is reduced.

11. The full-duplex communication method according to claim 9 , wherein the second signal synthesizing apparatus further receives a first receive signal from the at least two signal synthesizing apparatuses and synthesize the received first receive signals, wherein strength of the synthesized first receive signal is higher than strength of any one of the first re

Assignees

• Huawei Tech Co Ltd

Inventors

• Long Hao

Classifications

• H04B1/525

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

• H04B1/123

  using adaptive balancing or compensation means (adaptive filter circuits and algorithms H03H) · CPC title

• H04B7/086

  using weights depending on external parameters, e.g. direction of arrival [DOA], predetermined weights or beamforming · CPC title

• H04B7/0617 Primary

  for beam forming · CPC title

• H04L5/14 Primary

  Two-way operation using the same type of signal, i.e. duplex · CPC title