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Title Analysis and Optimization for Weighted Sum Rate in Energy Harvesting Cooperative NOMA Systems
Journal Name IEEE Trans. Veh. Technol. 2018
First Author Binh Van Nguyen
Coauthor Quang-Doanh Vu, Kiseon Kim
Publication Date 2018.09.28 Link Link icon
Impact Factor (%) 4.432 Date 2019-02-25 09:27
We consider a cooperative non-orthogonal multiple access system with radio frequency energy harvesting, in which a user with good channel harvests energy from its received signal and serves as a decode-and-forward relay for enhancing the performance of a user with poor channel. We here aim at maximizing the weighted sum rate of the system by optimizing the power allocation coefficient used at the source and the power splitting coefficient used at the user with good channel. By exploiting the specific structure of the considered problem, we propose a low-complexity one-dimensional search algorithm which can provide an optimal solution to the problem. As a benchmark comparison, we derive analytic expressions and simple high signal-to-noise ratio (SNR) approximations of the ergodic rates achieved at two users and their weighted sum with fixed values of the power allocation and the power splitting coefficients, from which the scaling of the weighted sum in the high SNR region is revealed. Finally, we provide numerical results to demonstrate the validity of the optimized scheme.
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