Patent ID: 8270918

Claim:
A method by a mobile terminal for receiving data, comprising: receiving data transmitted from a remote transmitter and precoded with a precoding matrix selected from a plurality of matrices that have a nested structure and are derived from a set of vector codebooks determined in accordance with the following expression: A ( v i 1 1 , v i 2 2 , v i 3 3 , … ⁢ ) = [ v i 1 1 , HH ⁡ ( v i 1 1 - e 1 M ) ⁡ [ 0 v i 2 2 ] , HH ⁡ ( v i 1 1 - e 1 M ) ⁡ [ 0 HH ⁡ ( v i 2 2 - e 1 M - 1 ) ⁡ [ 0 v i 3 3 ] ] , … ] , wherein e i N =[1, 0, . . . , 0] T εC N , M is the number of transmit antennas, C N is an N-dimensional complex space, HH ⁡ ( w ) = { I - 2 ⁢ ww H  w  2 if ⁢ ⁢ w ≠ 0 I if ⁢ ⁢ w = 0 ⁢ ⁢ and ⁢ ⁢ { v i j j ∈ C M - j + 1 } ⁢ is a vector codebook.