Patent ID: 8923435

Claim:
A method of generating a precoding matrix in a wireless communication system, the method comprising: receiving a feedback including information on an error angle θ of channel direction information (CDI) which indicates a direction of channel direction vector from a terminal, and generating a precoding matrix based on the information on the error angle θ of the CDI, wherein the error angle θ of the CDI indicates an angle between the channel direction vector and a quantized channel direction vector, wherein the error angle θ of the CDI includes at least one of a channel quantization error component, a channel feedback delay error component and a channel estimation error component, and wherein the channel direction vector and the quantized channel direction vector have a relationship of Equation below: {tilde over (h)} k =cos θ k ·v k +sin θ k ·e k , where {tilde over (h)} k is the channel direction vector on k th user, v k is the quantized channel direction vector on k th user, e k is an error vector on k th user, and θ k is the error angle on k th user.