ADMM Enabled Hybrid Precoding in Wideband Distributed Phased Arrays Based MIMO Systems

TL;DR

This paper proposes an ADMM-based hybrid precoding method for wideband DPA-MIMO systems with OFDM, improving performance in reconfigurable millimeter-wave architectures.

Contribution

It introduces a novel ADMM-AltMin hybrid precoding algorithm tailored for wideband DPA-MIMO systems with cooperative array structures.

Findings

Achieves favorable performance with practical phase shifter quantization

Effective hybrid precoding for wideband DPA-MIMO with OFDM

Demonstrates advantages over existing methods in simulations

Abstract

Distributed phased arrays based multiple-input multiple-output (DPA-MIMO) is a recently proposed highly reconfigurable architecture enabling both spatial multiplexing and beamforming in millimeter-wave (mmWave) systems. In this work, we focus on coping with the hybrid precoding for the wideband DPA-MIMO system with orthogonal frequency division multiplexing (OFDM) modulation. More specifically, we propose an alternating direction method of multipliers (ADMM) enabled hybrid precoding approach based on an alternating optimization framework, abbreviated to ADMM-AltMin, for such cooperative array-of-subarrays structures. Simulation results show that the proposed ADMM-AltMin method achieves favourable performance with practical quantization of phase shifters taken into account.