A codebook design approach for massive MIMO with planar antenna array

Abstract

In this paper codebook for massive MIMO system with planar array is studied. To separate spatially correlated and spatially uncorrelated parts of the channel, antennas are divided into a number of blocks according to their position in the array. Antennas in a block are spatially correlated and antennas across blocks tend to be spatially uncorrelated. A codebook design approach is proposed based on such antenna block division. After analyzing the correlation property, the codebook is proposed to be constructed from two component codebooks by Kronecker product. One component codebook is used to quantize spatially correlated part within a block, and the other codebook is designed to match channel across blocks which are spatially uncorrelated. The effectiveness of proposed codebook design approach is demonstrated by evaluation results.