Patent ID: 9680551
Date: 2017-06-13
CPC Classifications: H04B

Claim:
1. A method of generating a two-stage codebook set, the two-stage codebook set being applicable to a multi-input multi-output communication system in which a base station is configured with four cross-polarized transmit antennas, and the two-stage codebook set including a first-stage codebook set and a second-stage codebook set, wherein the method comprises: selecting a first codebook and a second codebook based upon information received from a user equipment; and multiplying the first codebook with the second codebook to obtain a target codebook, wherein the target codebook is determined by: generating a codebook matrix V based upon a two-antenna rank-1 DFT codebook c; determining the first-stage codebook set W  and determining the two-stage codebook set W wherein the generating comprises any one of: