2019/08/04 by Tasneem Assaf, Arafat Al‐Dweik, Assaf, Tasneem +5 · 1 citation
Engineering · #Advanced Wireless Communication Technologies #Satellite Communication Systems #Optical Wireless Communication Technologies
paper · pdf · doi:10.48550/arxiv.1908.01357
In this paper, the performance of a promising technology for the next\ngeneration wireless communications, non-orthogonal multiple access (NOMA), is\ninvestigated. In particular, the bit error rate (BER) performance of downlink\nNOMA systems over Nakagami-m flat fading channels, is presented. Under various\nconditions and scenarios, the exact BER of downlink NOMA systems considering\nsuccessive interference cancellation (SIC) is derived. The transmitted signals\nare randomly generated from quadrature phase shift keying (QPSK) and two NOMA\nsystems are considered; two users' and three users' systems. The obtained BER\nexpressions are then used to evaluate the optimal power allocation for two\ndifferent objectives, achieving fairness and minimizing average BER. The two\nobjectives can be used in a variety of applications such as satellite\napplications with constrained transmitted power. Numerical results and Monte\nCarlo simulations perfectly match with the derived BER analytical results and\nprovide valuable insight into the advantages of optimal power allocation which\nshow the full potential of downlink NOMA systems.\n