Hybrid Precoding for Multi-Group Physical Layer Multicasting

TL;DR

This paper proposes a hybrid precoding structure for multi-group multicasting in large-scale antenna systems, enabling performance comparable to fully-digital precoders with significantly fewer RF chains.

Contribution

It introduces a novel hybrid precoding method that reduces RF chain requirements in multi-group multicasting systems without sacrificing performance.

Findings

Achieves fully-digital precoder performance with G RF chains.

Applicable to systems with arbitrary antennas, groups, and users.

Reduces hardware complexity in large-scale antenna systems.

Abstract

Next generation of wireless networks will likely rely on large-scale antenna systems, either in the form of massive multi-input-multi-output (MIMO) or millimeter wave (mmWave) systems. Therefore, the conventional fully-digital precoders are not suitable for physical layer multicasting as they require a dedicated radio frequency chain per antenna element. In this paper, we show that in a multi-group multicasting system with an arbitrary number of transmit antennas, $G$ multicasting groups, and an arbitrary number of users in each group, one can achieve the performance of any fully-digital precoder with just $G$ radio frequency chains using the proposed hybrid multi-group multicasting structure.