On Performance Comparison of Multi-Antenna HD-NOMA, SCMA and PD-NOMA Schemes

TL;DR

This paper introduces a novel multi-antenna hybrid NOMA scheme combining SCMA and PD-NOMA, demonstrating superior uplink throughput performance through joint resource allocation optimization.

Contribution

The paper proposes a new MA-HD-NOMA scheme that enhances user capacity and throughput by combining SCMA and PD-NOMA with multiple antennas, along with optimized resource allocation methods.

Findings

MA-HD-NOMA outperforms MA-SCMA and MA-PD-NOMA in throughput.

The joint resource allocation problems are effectively solved using SCA and reweighted $ ext{l}_1$ methods.

Numerical results confirm the superior performance of the proposed scheme.

Abstract

In this paper, we study the uplink channel throughput performance of a proposed novel multiple-antenna hybrid-domain non-orthogonal multiple access (MA-HD-NOMA) scheme. This scheme combines the conventional sparse code multiple access (SCMA) and power-domain NOMA (PD-NOMA) schemes in order to increase the number of users served as compared to conventional NOMA schemes and uses multiple antennas at the base station. To this end, a joint resource allocation problem for the MA-HD-NOMA scheme is formulated that maximizes the sum rate of the entire system. For a comprehensive comparison, the joint resource allocation problems for the multi-antenna SCMA (MA-SCMA) and multi-antenna PD-NOMA (MA-PD-NOMA) schemes with the same overloading factor are formulated as well. Each of the formulated problems is a mixed-integer non-convex program, and hence, we apply successive convex approximation (SCA)- and reweighted $\ell_1$ minimization-based approaches to obtain rapidly converging solutions. Numerical results reveal that the proposed MA-HD-NOMA scheme has superior performance compared to MA-SCMA and MA-PD-NOMA.