An Efficient Limited Feedback for Multi-panel based 2D Antenna Array

In this paper, a multi-component codebook structure is proposed for a channel state information (CSI) feedback to achieve an optimized beamforming gain with a limited feedback overhead when a base station (BS) is equipped with a multi-panel based 2D antenna array, where each antenna panel is a uniform rectangular array (URA). The proposed multi-component code-book structure is extended from a codebook designed for a single-panel based 2D antenna array by introducing a component pre-coder which is used to co-phase precoders across the panels. System level simulation results show that introduction of the component precoders for co-phasing of multiple panels can provide significant user packet throughput performance gain with a marginal increase in feedback overhead.