Capacity Analysis of Non-Orthogonal Multiple Access for Uplink and Downlink

Abstract

Non-orthogonal multiple access (NOMA) is intended to be used for the next generation 5G cellular networks. In this paper, the expressions for the channel capacities for symmetric and asymmetric NOMA networks have been analysed. The performance measure of user spectral efficiency and the sum-rate bounds, for the NOMA and the existing orthogonal multiple access (OMA) networks have been compared. Furthermore, analysis of user rate and capacity of NOMA network has been carried out and it is observed that the NOMA capacity region varies as a function of the power allocation factor. The corresponding models have been developed for both uplink and downlink, and simulated with MATLAB. The NOMA performance with imperfect Successive Interference Cancellation (SIC) decoding is also analysed for the downlink. It is also verified that the transmit power may be increased to counter the spectral efficiency reduction due to imperfect SIC.

Comparative Analysis of Scheduling Algorithms in 5G Uplink Transmission

“…Cisco has predicted that 500 billion devices will have internet connectivity by 2030 while Ericsson has predicted that 29 billion devices will be connected to the internet by 2022 and 60% of that number will be related to IoT [5]. 5G has been developed for a broader range of applications compared to 4G which had primarily been developed for mobile communications [6].…”