# US 9,520,908 B2 · Full-duplex radio communication device, method and system

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- Number: US 9,520,908 B2
- Document ID: US9520908B2
- Status: Granted
- Kind: B2
- Application number: 14/509,382
- Filed: 2014-10-08
- Published: 2015-01-22
- Granted: 2016-12-13
- Earliest claimed: 2012-04-09
- Assignees: Huawei Technologies Co., Ltd.
- Applicants: Huawei Technologies Co., Ltd.
- Inventors: Yungang Li
- Web page: https://patentgrep.com/patent/US9520908B2

## CPC

- H04B 1/0475: {with means for limiting noise, interference or distortion (H04B1/0483 takes precedence)}
- H04B 1/525: with means for reducing leakage of transmitter signal into the receiver
- H04L 5/14: Two-way operation using the same type of signal, i.e. duplex
- H04B: TRANSMISSION
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

A full-duplex radio communication device, method and system are provided. A first polarized antenna in a dual-polarized antenna outputs a transmitted signal, and a second polarized antenna acquires a received signal which includes a first transmitted sub-signal that is directly coupled from the first polarized antenna. An analog domain cancellation module acquires a second transmitted sub-signal coupled from the transmitted signal, adjusts an amplitude and a phase parameter of the second transmitted sub-signal to convert the second transmitted sub-signal into a third transmitted sub-signal, eliminates the first transmitted sub-signal according to the third transmitted sub-signal, samples the received signal, from which the first transmitted sub-signal is eliminated, as a first digital signal, samples the second transmitted sub-signal as a second digital signal, and outputs the first digital signal and the second digital signal to a digital domain cancellation module.

## Claims

### Claim 1

A full-duplex radio communication device, comprising:
a dual-polarized antenna;
an analog domain cancellation module; and
a digital domain cancellation module,
wherein a first polarized antenna in the dual-polarized antenna is configured to output a transmitted signal, a second polarized antenna in the dual-polarized antenna is configured to acquire a received signal, and the received signal comprises a wanted signal and a first transmitted sub-signal that is directly coupled from the first polarized antenna through an air interface,
wherein the analog domain cancellation module is configured to acquire a second transmitted sub-signal coupled by the transmitted signal output from the first polarized antenna, adjust an amplitude and a phase parameter of the second transmitted sub-signal to convert the second transmitted sub-signal into a third transmitted sub-signal, eliminate, according to the third transmitted sub-signal, the first transmitted sub-signal in the received signal acquired by the second polarized antenna, sample the received signal, from which the first transmitted sub-signal is eliminated, as a first digital signal, and output the first digital signal to the digital domain cancellation module, sample the second transmitted sub-signal as a second digital signal at the same time, and output the second digital signal to the digital domain cancellation module, and
wherein the digital domain cancellation module is configured to eliminate the second digital signal in the first digital signal, and output the first digital signal from which the second digital signal is eliminated.

### Claim 2 (depends on 1)

The device according to claim 1, wherein the dual-polarized antenna is in an orthogonally polarized manner, which comprises one polarized antenna being a polarized antenna of +45 degrees, and the other polarized antenna being a polarized antenna of −45 degrees.

### Claim 3 (depends on 1)

The device according to claim 1, wherein the dual-polarized antenna is in an orthogonally polarized manner in which one polarized antenna is a vertically polarized antenna and the other polarized antenna is a horizontally polarized antenna.

### Claim 4 (depends on 1)

The device according to claim 1, wherein the dual-polarized antenna comprises multiple dual-polarized antennas, which comprise multiple transmitting antennas and a corresponding number of receiving antennas, and orthogonal polarization isolation is adopted between the transmitting antennas and the receiving antennas.

### Claim 5 (depends on 1)

The device according to claim 1, wherein the analog domain cancellation module comprises:
a second transmitted sub-signal acquisition unit configured to acquire, through a preset coupling circuit, the second transmitted sub-signal coupled by the transmitted signal output from the first polarized antenna;
a first analog-to-digital conversion unit configured to convert the second transmitted sub-signal into the second digital signal through an analog-to-digital conversion, and output the second digital signal to the digital domain cancellation module;
a third transmitted sub-signal acquisition unit configured to adjust the amplitude and the phase parameter of the second transmitted sub-signal according to an amplitude and a phase parameter sent from the digital domain cancellation module, to convert the second transmitted sub-signal into the third transmitted sub-signal;
a first interfering signal elimination unit configured to use the third transmitted sub-signal to eliminate the first transmitted sub-signal in the received signal acquired by the second polarized antenna; and
a second analog-to-digital conversion unit configured to convert the received signal, from which the first transmitted sub-signal is eliminated, into the first digital signal through analog-to-digital conversion, and output the first digital signal to the digital domain cancellation module.

### Claim 6 (depends on 1)

The device according to claim 1, wherein the digital domain cancellation module comprises:
a second interfering signal elimination unit configured to eliminate the second digital signal in the first digital signal through a preset interference elimination controller; and
an outputting unit configured to output the first digital signal, from which the second digital signal is eliminated, and send the amplitude and the phase parameter to the analog domain cancellation module.

### Claim 7

A full-duplex radio communication method, comprising:
outputting, by a first polarized antenna in a dual-polarized antenna, a transmitted signal;
acquiring, by a second polarized antenna in the dual-polarized antenna, a received signal, wherein the received signal comprises a wanted signal and a first transmitted sub-signal that is directly coupled from the first polarized antenna through an air interface;
acquiring a second transmitted sub-signal coupled by the transmitted signal output from the first polarized antenna;
adjusting an amplitude and a phase parameter of the second transmitted sub-signal to convert the second transmitted sub-signal into a third transmitted sub-signal;
eliminating, according to the third transmitted sub-signal, the first transmitted sub-signal in the received signal acquired by the second polarized antenna;
sampling the received signal, from which the first transmitted sub-signal is eliminated, as a first digital signal;
sampling the second transmitted sub-signal as a second digital signal;
eliminating the second digital signal in the first digital signal; and
outputting the first digital signal from which the second digital signal is eliminated.

### Claim 8 (depends on 7)

The method according to claim 7, wherein the dual-polarized antenna is in an orthogonally polarized manner, which comprises one polarized antenna being a polarized antenna of +45 degrees and the other polarized antenna being a polarized antenna of −45 degrees.

### Claim 9 (depends on 7)

The method according to claim 7, wherein the dual-polarized antenna is in an orthogonally polarized manner in which one polarized antenna is a vertically polarized antenna and the other polarized antenna is a horizontally polarized antenna.

### Claim 10 (depends on 7)

The method according to claim 7, wherein the dual-polarized antenna is multiple dual-polarized antennas, which comprise multiple transmitting antennas and a corresponding number of receiving antennas, and orthogonal polarization isolation is adopted between the transmitting antennas and the receiving antennas.

### Claim 11 (depends on 7)

The method according to claim 7, wherein acquiring the second transmitted sub-signal coupled by the transmitted signal output from the first polarized antenna, and adjusting the amplitude and the phase parameter of the second transmitted sub-signal to convert the second transmitted sub-signal into the third transmitted sub-signal comprises:
acquiring, through a preset coupling circuit, the second transmitted sub-signal coupled by the transmitted signal output from the first polarized antenna; and
adjusting the amplitude and the phase parameter of the second transmitted sub-signal according to the generated amplitude and phase parameter, to convert the second transmitted sub-signal into the third transmitted sub-signal.