Codebook Subsampling and Rearrangement Method for Large Scale MIMO Systems

In large scale MIMO （multiple-input multiple-output） systems, the size of codebook increases greatly when transmitters and receivers are equipped with more antennas. Thus, there are demands to select subsets of the codebook for usage to reduce the huge feedback overhead. In this paper, we propose a novel codebook subsampling method using chordal distance of different codewords and deleting them to affordable payload of PUCCH （physical uplink control channel）. Besides, we design a related codebook rearrangement algorithm to mitigate the system performance loss when there are bit errors in the feedback channel.