# US 10,374,682 B2 · Method and device for removing self-interference in wireless access system supporting full duplex radio scheme

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- Number: US 10,374,682 B2
- Document ID: US10374682B2
- Status: Granted
- Kind: B2
- Application number: 15/304,393
- Filed: 2014-04-17
- Published: 2017-02-09
- Granted: 2019-08-06
- Earliest claimed: 2014-04-17
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Jinmin Kim; Genebeck Hahn; Kwangseok Noh; Kukheon Choi; Jaehoon Chung; Eunjong Lee
- Web page: https://patentgrep.com/patent/US10374682B2

## CPC

- H04B 7/0686: {Hybrid systems, i.e. switching and simultaneous transmission}
- H04B 1/123: {using adaptive balancing or compensation means (adaptive filter circuits and algorithms H03H)}
- H04B 1/525: with means for reducing leakage of transmitter signal into the receiver
- H04B 1/54: using the same frequency for two directions of communication (H04B1/44 takes precedence)
- H04B 1/56: with provision for simultaneous communication in two directions
- H04B 15/02: Reducing interference from electric apparatus by means located at or near the interfering apparatus
- H04L 5/14: Two-way operation using the same type of signal, i.e. duplex
- H04L 5/1461: {Suppression of signals in the return path, i.e. bidirectional control circuits}
- H04B: TRANSMISSION
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

The present invention provides a method for removing a self-interference in a wireless access system supporting a full duplex radio (FDR) scheme, and devices for supporting the same. A method by which a transmission end removes self-interference in a wireless access system supporting an FDR scheme, according to one embodiment of the present invention, can comprise the steps of: transmitting two transmission signals by using two transmission antennas; receiving two reception signals by using two reception antennas; estimating a self-interference channel; and removing interference signals by considering the self-interference channel estimated from the reception signals. Here, the interference signals are the transmission signals which are inputted to the two reception antennas, the transmission signals and the reception signals are simultaneously transmitted and received through a resource region comprising the same time and frequency, and the two transmission antennas and the two reception antennas can be disposed on the transmission end in a diamond shape.

## Claims

### Claim 1

A transmitter for cancelling self-interference in a wireless access system supporting a full duplex radio (FDR) scheme, the transmitter comprising:
n transmission antennas;
n delays and attenuators; and
m reception antennas,
wherein n and m are natural numbers greater than 1,
wherein the n transmission antennas and the m reception antennas are arranged apart from each other by a constant distance,
wherein the n transmission antennas are arranged adjacent to each other,
wherein the m reception antennas are arranged adjacent to each other,
wherein when n signals respectively transmitted from the n transmission antennas are received by one of the m reception antennas, the n delays and attenuators connected to the n transmission antennas control the n signals received by the one of the m reception antennas to have the same channel characteristics, and
wherein a digital pre-equalizer configured by using at least one of the n delays and attenuators is used for converting a baseband signal.

### Claim 2 (depends on 1)

The transmitter of claim 1, wherein the n delays and attenuators apply at least one of time delay or power attenuation to each of the n signals transmitted from the n transmission antennas in consideration of an arrangement order of the n transmission antennas.

### Claim 3 (depends on 1)

The transmitter of claim 1, further comprising m delays and attenuators,
wherein the m delays and attenuators connected to the m reception antennas apply at least one of time delay or power attenuation to signals received by the m reception antennas.

### Claim 4 (depends on 1)

The transmitter of claim 1, wherein n and m are the same.