Towards Optimal Resource Allocation in Wireless Powered Communication Networks with Non-Orthogonal Multiple Access

Author's Department

Computer Science & Engineering Department

Second Author's Department

Electronics & Communications Engineering Department

Third Author's Department

Computer Science & Engineering Department

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All Authors

Mariam M.N. Aboelwafa; Mohamed A. Abd-Elmagid; Alessandro Biason; Karim G. Seddik; Tamer ElBatt; Michele Zorzi

Document Type

Research Article

Publication Title

Elsevier Ad hoc Networks

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The optimal allocation of time and energy resources is characterized in a Wireless Powered Communication Network (WPCN) with Non-Orthogonal Multiple Access (NOMA). We consider two different formulations; in the first one (max-sum), the sum-throughput of all users is maximized. In the second one (max-min), and targeting fairness among users, we consider maximizing the min-throughput of all users. Under the above two formulations, two NOMA decoding schemes are studied, namely, Low Complexity Decoding (LCD) and Successive Interference Cancellation Decoding (SICD). Due to the non-convexity of three of the studied optimization problems, we consider an approximation approach, in which the non-convex optimization problem is approximated by a convex optimization problem, which satisfies all the constraints of the original problem. The approximate convex optimization problem can then be solved iteratively. The results show a trade-off between maximizing the sum throughout and achieving fairness through maximizing the minimum throughput.

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