Patent ID: 9020444
Filing Date: 2015-04-28
Classification: H04B,H04L

Abstract:
1. A method implementable in a base station having a plurality of antennas, comprising: transmitting a plurality of reference signals from the plurality of antennas; receiving information indicative of at least a first codeword associated with a codebook from at least one user device after transmitting the plurality of reference signals; precoding at least one symbol using at least the first codeword; transmitting to the at least one user device the at least one precoded symbol; receiving feedback from the at least one user device after the at least one user device has received said at least one precoded symbol; precoding at least one second symbol using at least a second codeword, the second codeword being determined based at least on the feedback and the first codeword; and transmitting to the at least one user device the at least one precoded second symbol.