Tomlinson-Harashima Precoded Rate-Splitting for Multiuser MIMO Systems

TL;DR

This paper explores the use of Rate-Splitting combined with Tomlinson-Harashima Precoding in multiuser MIMO systems, demonstrating performance improvements over traditional methods through analytical expressions and simulations.

Contribution

It introduces a novel integration of RS with THP in multiuser MIMO, providing analytical expressions and performance analysis for both centralized and decentralized structures.

Findings

RS with THP outperforms standard THP.

RS with THP surpasses linear precoding schemes.

Performance gains are validated through simulations.

Abstract

In this work, we investigate the performance of Rate-Splitting (RS) based on Tomlinson-Harashima Precoding (THP) in a multiple-antenna broadcast channel with perfect and imperfect Channel State Information at the Transmitter (CSIT). In particular, we consider RS using centralized and decentralized THP structures, where only one user splits its message into a common and private part, and develop expressions to describe the signal-to-interference-plus-noise (SINR) ratio and the sum rates associated with these schemes. Furthermore, we also assess the performance achieved by RS combined with Dirty-Paper Coding (DPC). Simulations show that RS with THP outperforms existing standard THP and RS with linear precoding schemes.