Investigating High Performance Implementations of Sparse Code Multiple Access (SCMA) Codebook Design

Abstract

-The number of mobile devices, IoT devices, and their applications is increasing day by day in recent years and further going to increase in coming years. These applications and devices demand large connectivity, high throughput, and low latency which can be possible only in the B5G or 6G. The effective utilization of the spectrum is done by multiple access techniques which facilitate the spectrum to accommodate a large number of users. The 5G has different new technologies to support the massive user demand and high-speed data rate. The non-orthogonal multiple access scheme (NOMA) is considered for the B5G or 6G. The NOMA offers a massive number of user connectivity in contrast to the OMA which is an orthogonal multiple access scheme. The performance evaluation of the SCMA is investigated and recent advancement in the field of NOMA is discussed in this paper. The BER performance of Capacity-based codebook design and codebook design based on lattice constellation is evaluated on the two different channels i.e AWGN and Rayleigh fading channel. The behavior of capacity-based codebook design is better than lattice-based codebook design. The performance of both codebook designs surpasses AWGN in contrast to the Rayleigh fading channel by the multipath available in the Rayleigh Fading channel.