Performance analysis of non-orthogonal multiple access based vertical heterogeneous network.

Abstract

The future wireless networks promise to provide massive connections and higher spectral efficiency requirements to a multitude of devices with diversified traffic patterns wherever and whenever needed, various studies have been conducted on suitable technological advancement techniques such as Non-Orthogonal Multiple Access (NOMA), millimeter wave communication (mm Wave),visible Light communication(VLC), Massive MIMO (Multiple-Input Multiple-Output).Unmanned aerial vehicles (UAVs) based non-orthogonal multiple access (NOMA) transmission is also one of promising ways which has recently gained significant interests to leverage the strength of line-of-sight links and improve the coverage as well as maximize the throughput of wireless communications systems due to their mobility, flexibility in deployment and low cost. In this work we explore the potential benefits of deploying unmanned aerial vehicles (UAVs) as aerial base stations (ABSs) to assist the over loaded terrestrial base stations (TBSs) with non-orthogonal multiple access (NOMA) based scheme in cooperated into the network. We determined the performance evaluation in terms of spectral and energy efficiencies of the NOMA against that of OMA (Orthogonal Multiple Access) network based on the Rayleigh fading channel condition. By using tools from stochastic geometry and MATLAB software to model the spatial distribution of base stations (BSs), user equipment’s (UEs), their respective channel conditions in the environment, system design, algorithm implementation and finally for performance analysis for the characterized UAV aided networks based on NOMA and OMA under the Air-to-Ground (A2G) and Ground-to-Ground (G2G) channel models. Simulation results reveal that the performance of the NOMA- based VHetNet out performs the OMA-based VHetNet.