US 2026/0280630 A1 · RECIPROCITY-AIDED INTERFERENCE SUPPRESSION VIA EIGEN BEAMFORMING

Abstract

A method and network node for reciprocity-aided interference suppression via eigen beamforming are disclosed. According to one aspect, a method includes determining an L×M channel matrix by selecting L rows of an N×M channel matrix or L linear combinations of rows of the N×M channel matrix, M being a number of antennas for downlink transmissions, N being a number of wireless device receiving antennas, L being a number of layers. The method also includes determining an M×M preprocessing matrix based on an eigen-decomposition of an M×M interference covariance matrix. The method further includes determining an M×L RAIT precoder matrix based on an inverse of an L×L matrix, the L×L matrix being based on a first matrix product of the L×M channel matrix, the M×M preprocessing matrix and an M×L Hermitian transpose of the L×M channel matrix.

Claims20

Dependent claims

A method in a network node configured to determine a reciprocity-aided interference aware transmission, RAIT, precoder matrix for precoding downlink transmissions to a wireless, WD, the method comprising:

determining an L×M channel matrix by one of:
selecting L rows of an N×M channel matrix;
and
selecting L linear combinations of rows of the N×M channel matrix,
M being a number of antennas at the network node to be used for the downlink transmissions, N being a number of receiving antennas at the WD, L being an integer less than M;
determining an M×M preprocessing matrix based at least in part on an eigen-decomposition of an M×M interference covariance matrix;
and
determining an M×L RAIT precoder matrix based at least in part on an inverse of an L×L matrix, the L×L matrix being based at least in part on a first matrix product of the L×M channel matrix, the M×M preprocessing matrix and an M×L Hermitian transpose of the L×M channel matrix.

5 more elements

A network node configured to determine a reciprocity-aided interference aware transmission, RAIT, precoder matrix for precoding downlink transmissions to a wireless, WD, the network node comprising processing circuitry configured to:

determine an L×M channel matrix by one of:
selecting L rows of an N×M channel matrix;
and
selecting L linear combinations of rows of the N×M channel matrix;
M being a number of antennas at the network node to be used for the downlink transmissions, N being a number of receiving antennas at the WD, L being an integer less than M;
determine an M×M preprocessing matrix based at least in part on an eigen-decomposition of an M×M interference covariance matrix;
and
determine an M×L RAIT precoder matrix based at least in part on an inverse of an L×L matrix, the L×L matrix being based at least in part on a first matrix product of the L×M channel matrix, the M×M preprocessing matrix and an M×L Hermitian transpose of the L×M channel matrix.

5 more elements

Dependencies are inferred from the claim text.

Reciprocity-aided interference suppression via eigen beamforming

Life of this patent

Reciprocity-aided interference suppression via eigen beamforming

Life of this patent

Abstract

Claims20