Performance Analysis of Sparse Code Multiple Access MIMO Systems

This paper addresses the implementation and performance analysis of sparse code multiple access (SCMA)-multiple-input multiple-output (MIMO) systems. SCMA is a promising technology to accommodate the ever-increasing number of users as well as spectral and bandwidth efficiency enhancements for next generations wireless systems. Also, MIMO techniques promise significant enhancements in reliability and spectral efficiency of wireless systems. In this study, spatial modulation (SM) and spatial multiplexing (SMX) MIMO techniques are considered along with SCMA. The analytical average bit error ratio (ABER) bound over Rayleigh fading channels is derived and shown to be accurate for a wide range of system parameters. Derived analytical formulas are corroborated through Monte Carlo simulation results and the impact of variant system and channel parameters on the performance of both SCMA-SMX and SCMA-SM systems are thoroughly investigated.