US 8,570,933 B2Granted

Self-interference suppression in full-duplex MIMO relays

AssigneeTelefonaktiebolaget L M Ericsson (publ)

InventorsPanagiota Lioliou, Mats Viberg, Mikael Coldrey

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Abstract

A method, and an apparatus, for self-interference suppression in a relay for wireless communication, wherein the relay is arranged for receiving a signal r(n) transmitted from a transmitter, and for transmitting a self-interference suppressed transmit signal xr(n) to a receiver. The self-interference suppressed transmit signal xr(n) is achieved by determining a receive suppression filter matrix Wr, determining a relay amplification matrix G, and determining a transmit suppression filter matrix Wt, and then applying the suppression filters and the amplification matrix to the received signal r(n).

Claims10

Dependent claims

A method for self-interference suppression in a relay for wireless communication, wherein said relay is a part of a communication channel between a transmitter and a receiver in a wireless communication system, said relay being arranged for receiving a signal r(n) transmitted from said transmitter, and transmitting a self-interference suppressed transmit signal xr(n) to said receiver, said communication channel having a transmit channel, defined by a transmit channel matrix (H1) between said transmitter and said relay, a receive channel, defined by a receive channel matrix (H2) between said relay and said receiver, and a self-interference channel between an relay output and a relay input of said relay, the self-interference channel being defined by a self-interference channel matrix (H0), the method comprising:

receiving at the relay input of said relay a receive signal r(n) transmitted from said transmitter over said transmit channel;
determining a receive suppression filter matrix Wr, in said relay, based on said transmit channel matrix (H1) and said self-interference channel matrix (H0);
determining a transmit suppression filter matrix Wt, in said relay, based on said receive suppression filter matrix Wr, said receive channel matrix (H2), and said self-interference channel matrix (H0);
determining a self-interference suppressed transmit signal xr(n) by applying said receive suppression filter matrix Wr, a relay amplification matrix G and said transmit suppression filter matrix Wt, to said received signal r(n);
and
transmitting said self-interference suppressed transmit signal xr(n) from said relay over said receive channel to said receiver.

3 more elements

A relay adapted for self-interference suppression in a wireless communication system, wherein said relay is configured to be a part of a communication channel between a transmitter and a receiver in a wireless communication system, said communication channel having a transmit channel, defined by a transmit channel matrix (H1), between said transmitter and said relay, a receive channel, defined by a receive channel matrix (H2), between said relay and said receiver, and a self-interference channel between a relay output and a relay input of said relay, the self-interference channel being defined by a self-interference channel matrix (H0), said relay comprising:

a receiver unit adapted to receive a receive signal r(n) transmitted from said transmitter over said transmit channel;
a first processing unit adapted to determine a receive suppression filter matrix Wr, based on said transmit channel matrix (H1) and said self-interference channel matrix (H0);
a second processing unit adapted to determine a transmit suppression filter matrix Wt, based on said receive suppression filter matrix Wr, said receive channel matrix (H2), and said self-interference channel matrix (H0);
a third processing unit adapted to determine a relay amplification matrix G;
and
a fourth processing unit adapted to produce a self-interference suppressed transmit signal xr(n) by applying said receive suppression filter matrix Wr from said first processing unit, said transmit suppression filter matrix Wt from said second processing unit, and said relay amplification matrix G from said third processing unit to said receive signal r(n), wherein said fourth processing unit is further adapted to supply said self-interference suppressed transmit signal xr(n) to a transmitter unit;
wherein
said transmitter unit is adapted to receive said self-interference suppressed transmit signal xr(n) from said fourth processing unit, and adapted to transmit said self-interference suppressed transmit signal xr(n) to said receiver over said transmit channel.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/288,475Filed 3 Nov 2011 · us provisional application
Priority: 3 Nov 2010
Published: US 2012/0106405 A13 May 2012
Granted: 29 Oct 2013
Term ends: Not estimatedThe source records don’t support an estimate.

Classification3 codes

H04B 7/15564
Ground-based stations: relay station antennae loop interference reduction
H04B 7/15528
Ground-based stations: control of operation parameters of a relay station to exploit the physical medium
H04B
Transmission

Family

Application61/409,571Us provisional application · filed 3 Nov 2010
US 2012/0106405 A1Pre-grant publication · published 3 May 2012
US 8,570,933 B2This patent

From the US filing history. Foreign family members aren’t listed.

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