Mitigating Intra-Cell Pilot Contamination in Massive MIMO: A Rate Splitting Approach

TL;DR

This paper introduces a rate-splitting multiple access (RSMA) approach for downlink massive MIMO systems to effectively mitigate pilot contamination, resulting in improved spectral efficiency over traditional methods.

Contribution

It proposes a novel RSMA-based downlink transmission framework for TDD massive MIMO, including precoder design and power allocation strategies to enhance spectral efficiency.

Findings

RSMA significantly improves robustness to pilot contamination.

RSMA achieves equal or better spectral efficiency than conventional methods.

Numerical results validate the effectiveness of the proposed approach.

Abstract

Massive multiple-input multiple-output (MaMIMO) has become an integral part of the fifth-generation (5G) standard, and is envisioned to be further developed in beyond 5G (B5G) networks. With a massive number of antennas at the base station (BS), MaMIMO is best equipped to cater prominent use cases of B5G networks such as enhanced mobile broadband (eMBB), ultra-reliable low-latency communications (URLLC) and massive machine-type communications (mMTC) or combinations thereof. However, one of the critical challenges to this pursuit is the sporadic access behaviour of a massive number of devices in practical networks that inevitably leads to the conspicuous pilot contamination problem. Conventional linearly precoded physical layer strategies employed for downlink transmission in time division duplex (TDD) MaMIMO would incur a noticeable spectral efficiency (SE) loss in the presence of this pilot contamination. In this paper, we aim to integrate a robust multiple access and interference management strategy named rate-splitting multiple access (RSMA) with TDD MaMIMO for downlink transmission and investigate its SE performance. We propose a novel downlink transmission framework of RSMA in TDD MaMIMO, devise a precoder design strategy and power allocation schemes to maximize different network utility functions. Numerical results reveal that RSMA is significantly more robust to pilot contamination and always achieves a SE performance that is equal to or better than the conventional linearly precoded MaMIMO transmission strategy.