Patent ID: 8767681
Filing Date: 2014-07-01
Classification: H04B,H04L,H04W

Abstract:
1. A method in a second wireless communication transceiver of providing precoder selection feedback to a first wireless communication transceiver, as precoding information for said first transceiver, wherein said method includes determining channel conditions at the second transceiver and comprises: when operating in a first feedback mode: selecting a precoder from a predetermined set of precoders based on said channel conditions wherein at least some of the precoders in the predetermined set of precoders are based on a factorized precoder design comprising a conversion precoder with a block diagonal matrix structure and a tuning precoder with a double block diagonal matrix structure, and sending a full-range index value, with the ability to indicate any of the precoders in the predetermined set, for the selected precoder to said first transceiver as said precoder selection feedback; when operating in a second feedback mode: selecting a precoder from a smaller, predetermined subset of precoders contained within the predetermined set of precoders based on said channel conditions wherein the predetermined subset of precoders is based on the factorized precoder design, and sending a smaller-range index value, with the ability to only indicate precoders within the predetermined subset of precoders, for the selected precoder to said first transceiver as said precoder selection feedback; and using a smaller signaling payload for sending smaller-range index values as compared to the signaling payload used to send full-range index values.