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Non-orthogonal multiple access (NOMA) is a candidate multiple access schemein 5G systems for the simultaneous access of tremendous number of wirelessnodes. On the other hand, RF-enabled wireless energy harvesting is a promisingtechnology for self-sustainable wireless nodes. In this paper, we consider aNOMA system where the near user harvests energy from the strong radio signal topower-on the information decoder. A generalized energy harvesting scheme isproposed by combining the conventional time switching and power splittingscheme. The achievable rate region of the proposed scheme is characterizedunder both constant and dynamic decoding power consumption models. If thedecoding power is constant, the achievable rate region can be found by solvingtwo convex optimization subproblems, and the regions for two special cases:time switching and power splitting, are characterized in closed-form. If thedecoding power is proportional to data rate, the achievable rate region can befound by exhaustive search algorithm. Numerical results show that theachievable rate region of the proposed generalized scheme is larger than thoseof time switching scheme and power splitting scheme, and rate-dependent decoderdesign helps to enlarge the achievable rate region.

Achievable Rate Region of Non-Orthogonal Multiple Access Systems with Wireless Powered Decoder