In this paper, the performance of a promising technology for the next generation wireless communications, non-orthogonal multiple access (NOMA), is investigated. In particular, the bit error rate (BER) performance of downlink NOMA systems over Nakagami-m flat fading channels, is presented. Under various conditions and scenarios, the exact BER of downlink NOMA systems considering successive interference cancellation (SIC) is derived. The transmitted signals are randomly generated from quadrature phase shift keying (QPSK) and two NOMA systems are considered; two users' and three users' systems. The obtained BER expressions are then used to evaluate the optimum power allocation for two different objectives, achieving fairness and minimizing average BER. The two objectives can be used in a variety of applications such as satellite applications with constrained transmitted power. Numerical results and Monte Carlo simulations perfectly match with the derived BER analytical results and provide valuable insight into the advantages of optimum power allocation which show the full potential of downlink NOMA systems. NOMA, BER, SIC, optimum power allocation, fairness, minimum average BER, Nakagami-m. 134554 VOLUME 7, 2019 T. Assaf et al.: Exact BER Performance Analysis for Downlink NOMA Systems Over Nakagami-m Fading Channels ARAFAT AL-DWEIK (S'97-M'01-SM'04) received the M.S. (summa cum laude) and Ph.D. (magna cum laude) degrees in electrical engineering from Cleveland State University, Cleveland, OH, USA, in and also with the University of Guelph. He has extensive editorial experience, where he served as an Associate Editor for the IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY and the IET Communications. He has extensive research experience in various areas of wireless communications that include modulation techniques, channel modeling and characterization, synchronization and channel estimation techniques, OFDM technology, error detection and correction techniques, MIMO, and resource allocation for wireless networks.
In REF , the BER performance of downlink NOMA systems over Nakagami-m fading channels was investigated.
Exact BER Performance Analysis for Downlink NOMA Systems Over Nakagami- $m$ Fading Channels
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