Patent ID: 8249659
Filing Date: 2012-08-21
Classification: H04B,H04W

Abstract:
1. A method implemented in a mobile terminal, comprising: generating feedback information for transmission in order for a remote transmitter to select a precoding matrix from a codebook comprising codebook entries V in the form where the remote transmitter has M=4 antennas, e 1 N =[1, 0, . . . , 0] T εC N (N=M, M−1, . . . ), C N being N-dimensional complex space, v a denotes a column vector, v b a denotes the b th element of the vector v a , is the house-holder transformation of the vector w and v a is selected from a set V a where V 1 =½{[1, 1, 1, 1] T , [1, −j, −1, j] T , [1, −1, 1, −1] T , [1, j, −1, −j] T , [1, f, −j, −g] T , [1, −g, j, f] T , [1, −f, −j, g] T , [1, g, j, −f] T , [1, 1, −1, −1] T , [1, −j, 1, −j] T , [1, −1, −1, 1] T , [1, j, 1, j] T , [1, 1, 1, −1] T , [1, 1, −1, 1] T , [1, −1, 1, 1] T , [1, −1, −1, −1] T }, where f=(1−j)/√{square root over (2)}, g=(1+j)/√{square root over (2)}, and j=√{square root over (−1)}, V 2 ={e 1 3 }, V 3 ={e 1 2 }, and V 4 ={e 1 1 }; and providing the feedback information to the remote transmitter.