On the Performance of NOMA-based Cooperative Relaying with Receive Diversity

TL;DR

This paper analyzes the performance of NOMA-based cooperative relaying systems with receive diversity, demonstrating improved spectral efficiency and diversity order over traditional OMA in 5G networks.

Contribution

It provides the first comprehensive analysis of CRS-NOMA with selection combining and maximal-ratio combining, including sum rate, outage probability, and diversity performance.

Findings

CRS-NOMA outperforms CRS-OMA at high SNR.

Achieves full diversity order with NOMA schemes.

Enhanced spectral efficiency with receive diversity schemes.

Abstract

Non-orthogonal multiple access (NOMA) is widely recognized as a potential multiple access (MA) technology for efficient spectrum utilization in the fifth-generation (5G) wireless standard. In this paper, we present the achievable sum rate analysis of a cooperative relaying system (CRS) using NOMA with two different receive diversity schemes - selection combining (SC), where the antenna with highest instantaneous signal-to-noise ratio (SNR) is selected, and maximal-ratio combining (MRC). We also present the outage probability and diversity analysis for the CRS-NOMA system. Analytical results confirm that the CRS-NOMA system outperforms the CRS with conventional orthogonal multiple access (OMA) by achieving higher spectral efficiency at high transmit SNR and achieves a full diversity order.