Patent ID: 8537921

Claim:
A method for generating a codebook in a Closed-Loop (CL)-Multiple Input Multiple Output (MIMO) system, the method comprising: determining weight vectors v i (i=1, . . . , 2 L ), using a processor, for a codebook V(4, 1, L), where N t of a codebook V(N t , s, L) denotes a number of antennas, s denotes a number of streams, and L denotes a number of codebook index bits; determining a unitary matrix T i using an i-th vector v i of the codebook V(4, 1, L); and determining an i-th weight matrix of a codebook V(4, 2, L) by selecting a first column of the unitary matrix T i as a first column of the weight matrix and selecting a column selected from other columns, excluding the first column of the unitary matrix T i in a particular pattern, as a second column of the weight matrix.