Dynamic Subarray Architecture for Wideband Hybrid Precoding
in Millimeter Wave Massive MIMO Systems


Authors:

Sungwoo Park, Ahmed Alkhateeb and Robert W. Heath, Jr.

Reference:

to appear in Proc. of Global Conference on Signal and Information Processing (GlobalSIP), Dec. 7-9, 2016.

Abstract:

Hybrid precoding architectures can address the trade-off between achievable spectral efficiency and power consumption in large-scale MIMO systems. Most of the prior work on hybrid precoding focused on narrowband channels and assumed fully-connected hybrid architectures. In this paper, a closed-form solution for OFDM-based wideband hybrid precoding is developed for both fully-connected and subarray architectures in frequency selective channels. The closed form solution provides useful insights into how hybrid subarray structures should be designed. Based on that, we propose a novel technique that dynamically constructs the hybrid subarrays based on the long-term channel characteristics.