Exact Outage Performance of NOMA Networks Under Impact of Interference Among Users

Abstract

To increase the spectrum efficiency and system throughput with comparison on the conventional orthogonal multiple access (OMA), non-orthogonal multiple access (NOMA) is proposed as a favorable technique for the 5th generation (5G) wireless communication network. In this paper, considering on Rayleigh fading channels, the conventional NOMA based relaying networks including the base station and NOMA users, in which base station connects with multiple mobile users concurrently by employing a Decode-and-Forward (DnF) relay. Firstly, the system outage behavior is studied, and closeform expressions for the exact outage probability is performed, respectively. The analytical results are further evaluated in the high SNR regime to evaluation of the network. Finally, numerical examples are conducted to confirm the validity of our analysis and show a comparison of NOMA with different target rates.