Publication

Abstract : The Beyond 5G and future wireless technologies are emerging to provide the highest data rate for massive number of subscribers through Non-Orthogonal Multiple Access (NOMA). In this paper, we investigate the impact of inter-cell interference caused by the high density of base stations in NOMA cellular systems by considering a coordinated three-cell user relaying cooperative downlink NOMA system, in which the cell-edge user receives messages from the multiple base stations and also the near users re-transmit the message to the cell-edge user through the Decode and Forward method. We derive the outage probability and ergodic capacity expressions for the cell-edge user in the presence of the Nakagami-m fading channel. We present improvement in the cell-edge user's performance metrics, which were validated by analytical and simulation results. Also, we develop an algorithm to find the error probability of cell-edge user and obtain the optimum power allocation coefficients to achieve user fairness through simulation results. Finally, the proposed system achieves a gain of 10 dB in outage and error performance, and 20 dB in ergodic capacity compared to conventional cooperative NOMA systems.