Throughput Maximization for Cognitive Radio With Wirelessly Powered Primary Users

Throughput Maximization for Cognitive Radio With Wirelessly Powered Primary Users
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无线供电主要用户的认知无线电吞吐量最大化

DOI:
10.1109/jsyst.2019.2935263
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发表时间:
2020-06
影响因子:
4.4
通讯作者:
Li Youming
Li Youming
中科院分区:
计算机科学2区
文献类型:
--
作者:
Sun Mingyang;Jin Ming;Guo Qinghua;Li Youming

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本文讨论了资源分配,以最大化认知无线电中的次要用户 (SU) 吞吐量,其中主要用户 (PU) 在时隙的第一部分由 SU 信号无线供电,而 PU 和 SU 在时隙的第二部分共享频谱。优化问题被制定为在最小 PU 吞吐量(由于服务质量)的约束下最大化 SU 吞吐量。由于优化问题是NP-hard问题,我们通过引入辅助变量(即PU消耗的能量)将问题分解为两个子问题,并通过最小化PU消耗的能量来解耦子问题。然后提出了三步资源分配方案来解决复杂度较低的优化问题。数值模拟证明了所提出的方案在性能和计算复杂性方面的优越性。
This article deals with resource allocation to maximize the secondary user (SU) throughput in cognitive radio where primary users (PUs) are wirelessly powered by SU signals during the first part of a time-slot, and PUs and SUs share the spectrum during the second part of the time-slot. An optimization problem is formulated to maximize SU throughput under a constraint of minimum PU throughput (due to quality-of-service). As the optimization problem is NP-hard, we decompose the problem into two subproblems by introducing an auxiliary variable, i.e., the consumed energy at PU, and the subproblems are decoupled by minimizing the PU consumed energy. A three-step resource allocation scheme is then proposed to solve the optimization problem with low complexity. Numerical simulations are provided to demonstrate the superiority of the proposed scheme in terms of both performance and computational complexity.
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