Improved codebook design for precoding of OSTBCs in correlated MIMO channels with finite rate feedback

Abstract

In this paper, we propose a novel codebook-based precoding design for orthogonal space-time block codes (OSTBCs) over multiple-input multiple-output (MIMO) channels with finite rate feedback. The proposed approach aims at providing better system performance by utilizing the property of OSTBCs and the prior information of the statistical antenna correlation. Under a new way of controlling the average transmit power, a novel structure of precoding matrix is given, which is different from the unitary precoding. Moreover, with the information of the transmit correlation matrix, the codebook design is generalized to correlated channels. Both theoretical analyses and simulation results are provided.