Performance Analysis of Cooperative NOMA for Future Communication Systems

Abstract

The rapid growth of advanced multimedia applications, IoT, and Industry 4.0 has in- newlinecreased the demand for wireless systems with high data rates, reliability, massive connec- newlinetivity, spectral efficiency, and low latency. 5G New Radio (NR), as outlined in the 3GPP newlineIMT-2020 standards, addresses these needs through three key use cases: enhanced mo- newlinebile broadband (eMBB), ultra-reliable low-latency communication (uRLLC), and massive newlinemachine-type communications (mMTC). As advanced air interface technologies continue to newlineevolve, the wireless medium face challenges, including small-scale fading, large-scale fading, newlinesignal attenuation, path loss, etc. newlineWireless environment encounters various challenges that affect the overall performance of newlinethe system. Cooperative communication enhances the system s performance in terms of newlinetransmitter reliability, network coverage and achievable capacity. To handle the explo- newlinesive growth in data traffic efficiently, multiple access techniques play an essential role in newlineaccommodating numerous users. However, due to limited radio resources, it is highly chal- newlinelenging for the orthogonal multiple access (OMA) system to support massive connectivity. newlineThe non-orthogonal multiple access (NOMA) scheme is considered as a potential candidate newlinecompared to OMA for providing efficient utilization of spectrum while supporting massive newlineaccess. Further, the amalgamation of cooperative and NOMA systems has drawn a signifi- newlinecant attention to enhance the service coverage, increase diversity gain with improvement in newlinethe spectral efficiency. newline