A BNBF User Selection Scheme for NOMA-Based Cooperative Relaying Systems with SWIPT

Nhu Tri Do, Daniel Benevides da Cost, Trung Q, Duong, Beongku An

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n this letter, we investigate the outage performance of cooperative relaying transmissions in two-user non-orthogonal multiple access (NOMA) systems, wherein simultaneous wireless information and power transfer (SWIPT) is employed at the near users to power their relaying operations. To this end, a best-near best-far (BNBF) user selection scheme is proposed. Considering three relaying protocols, i.e., decode-and-forward (DF), amplifyand- forward (AF), and hybrid DF/AF protocols, tight closedform approximate expressions for the outage probability (OP) are derived to evaluate the system performance. Numerical results reveal that, for any relaying protocols used, the diversity order achieved by the BNBF scheme is M+1, where M is the number of far users, and does not depend on the number of near users
Original languageEnglish
Number of pages4
JournalIEEE Communications Letters
Early online date22 Nov 2016
Publication statusEarly online date - 22 Nov 2016

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