Patent ID: 8743998
Filing Date: 2014-06-03
Classification: H04B,H04L

Abstract:
1. A device for generating a transmission codebook in a communication system including a multi-input multi-output (MIMO) antenna, comprising: a frequency determiner that determines a frequency value to allow the transmission codebook to have an optimal characteristic; a precoding matrix generator that generates a precoding matrix on the basis of the determined frequency value; and a codebook generator that generates a retransmission codebook to be used for retransmission on the basis of the precoding matrix and generates the transmission codebook on the basis of the retransmission codebook, wherein the transmission codebook is generated in a form in which the initial codebook and the retransmission codebook are concatenated with each other, wherein the precoding matrix generator generates the precoding matrix defined as in the below Equation {φ: the precoding matrix, diag{ }: a diagonal matrix, exp( ): an exponential function, C: the size of the transmission codebook, u