Patent ID: 9112561
Filing Date: 2015-08-18
Classification: H04B,H04L,H04W

Abstract:
1. A method for precoding data in a wireless communication system, comprising: receiving, by a receiving device, at least one reference signal from a transmitting device; deriving, by the receiving device, a rank indication, a first codebook index in a first codebook, and two second codebook indices in a second codebook, based on the at least one reference signal; sending, by the receiving device, the rank indication, the first codebook index in the first codebook, and the two second codebook indices in the second codebook, to the transmitting device; and receiving, by the receiving device, data precoded by a second precoder and a third precoder from the transmitting device, wherein the second precoder is determined based on the first codebook index and one of the two second codebook indices, and the third precoder is determined based on the first codebook index and the other one of the two second codebook indices.