System and method for channel state related feedback in multi-user multiple-input-multiple-output systems

摘要

System and method for dimension reduction and for channel and interference condition feedback in a Multi-User Multiple-Input-Multiple-Output (MU MIMO) wireless communication systems are provided herein. The method for dimension reduction includes determining a number of virtual antennas, vk, for beamformees pertaining to a multi user (MU) transmission group, reducing the dimension of the matrix by selecting a sub-set of antennas or by Eigen mode selection and sending a reduced dimension candidate transmit beamforming matrix or an effective channel matrix to a beamformer. The method for channel and interference condition feedback Interference condition includes sending to a beamformee metric indicative of the interference level from other streams.

主权项

1. A method for dimension reduction, the method comprising:
sending at least one matrix related to channel sounding to a beamformer, said matrix has a dimension that is smaller than a maximum dimension, wherein the channel sounding is defined between a beamformer and beamformees, wherein said matrix is based on a channel matrix of said channel sounding, wherein said maximum dimension is the dimension of the channel matrix, and wherein the matrix is calculated effectively on a reduced dimension channel matrix, wherein the beamformer has informed the beamformee of a value of the reduced dimension channel matrix prior to the sending of the reduced dimension channel matrix by the beamformee, wherein said calculating is executed by a computer processor.