US Patent No. 9,479,239

FEEDBACK BASED ON DESIGNATED SUBSET OF CODEBOOK


Patent No. 9,479,239
Issue Date October 25, 2016
Title Feedback Based On Designated Subset Of Codebook
Inventorship Lai King Tee, Dallas, TX (US)
Yi Song, Plano, TX (US)
Neng Wang, Plano, TX (US)
Assignee Apple Inc., Cupertino, CA (US)

Claim of US Patent No. 9,479,239

1. A method for operating a user equipment (UE) device, to facilitate communication with a base station, the method comprising:
transmitting, by a transmitter of the UE device, a codeword index to the base station, wherein the codeword index identifies
a first codebook weighting matrix from within a designated subset of a codebook, wherein the codebook includes at least six
codebook weighting matrices, wherein each of the codebook weighting matrices includes one or more layer-related columns, wherein
each of the layer-related columns includes a plurality of complex weight values having absolute value less than or equal to
one;

receiving, by a receiver of the UE device, signals from a channel, wherein the signals have been generated by a precoding
operation based on a particular codebook weighting matrix from the designated subset; and

recovering, by the receiver, information from the received signals.