Outage Analysis of Cooperative NOMA Using Maximum Ratio Combining at Intersections

TL;DR

This paper analyzes how maximum ratio combining enhances cooperative NOMA performance at intersections in vehicular networks, showing significant outage probability improvements over classical NOMA and OMA, especially near intersections.

Contribution

It introduces closed-form outage probability expressions for cooperative NOMA with MRC at intersections, demonstrating its superiority over classical NOMA and OMA through analysis and simulations.

Findings

MRC cooperative NOMA outperforms classical cooperative NOMA in outage probability.

NOMA provides better performance than OMA at intersections.

Outage probability increases as nodes approach the intersection.

Abstract

The paper investigates the improvement of using maximum ratio combining (MRC) in cooperative vehicular communications (VCs) transmission schemes considering non-orthogonal multiple access scheme (NOMA) at intersections. The transmission occurs between a source and two destination nodes with a help of a relay. The transmission is subject to interference originated from vehicles that are located on the roads. Closed form outage probability expressions are obtained. We compare the performance of MRC cooperative NOMA with a classical cooperative NOMA, and show that implementing MRC in cooperative NOMA transmission offers a significant improvement over the classical cooperative NOMA in terms of outage probability. We also compare the performance of MRC cooperative NOMA with MRC cooperative orthogonal multiple access (OMA), and we show that NOMA has a better performance than OMA. Finally, we show that the outage probability increases when the nodes come closer to the intersection, and that using MRC considering NOMA improves the performance in this context. The analysis is verified with Monte Carlo simulations.