Method of variable rate single user and multi user MIMO feedback for mobile communications system

摘要

A spatial channel state information (CSI) feedback technique is incorporated into multiple-input multiple-output mobile communications technologies. User equipment (UE) channel conditions are measured and, based on the measurements, codebook subsets are selected to which indices are assigned and fed back to a base station.

主权项

1. A method to generate feedback in a multiple-input multiple-output (MIMO) system which comprises:
performing at least one measurement of a channel condition; selecting a subset of a codebook based on the at least one measurement, the subset comprising a plurality of codewords and a plurality of indices; selecting one of the plurality of codewords based on a certain criterion and assigning one of the plurality of indices to the one of the plurality of codewords, wherein the one of the plurality of indices is assigned so a distance between a quantized composite spatial channel state information (CSI) and a floating-point composite spatial CSI minimized; and transmitting a feedback signal comprising the one of the plurality of indices.