Browsing by Author "Wu, Chi-Lun"

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Optimal Power Control for NOMA Wireless Networks With Relays
(2018-02-01)
Gau, Rung-Hung
;
Chiu, Hsiao-Ting
;
Liao, Chien-Hsun
;
Wu, Chi-Lun
;
電信工程研究所
In this letter, we propose a novel approach for dynamically selecting an optimal relay mode and optimal transmission power levels in non-orthogonal multiple access wireless networks with relays. To maximize the network throughput, the proposed approach alternates between the one-relay mode and the two-relay mode based on channel state information. For the two-relay mode, we derive novel closed-form results on optimal power control. Unlike in a conventional one-hop network, it is not always optimal to allocate all power to the relay with the largest channel gain in the studied two-hop network. Based on the closed-form results, one could determine the optimal power levels quickly. Simulation results show that the proposed approach could significantly increase the network throughput.