This letter considers a multi-pair decode-and-forward relay network where a power-splitting (PS) protocol is adopted at the energy-constrained relay to provide simultaneous wireless information and energy harvesting (EH). To achieve higher efficiency of EH, we propose a new PS-based EH architecture at the relay by incorporating an alternating current (AC) computing logic, which is employed to directly use the wirelessly harvested AC energy for computational blocks. Under a nonlinear EH circuit, our goal is to maximize the fairness of end-to-end rate among user pairs subject to power constraints, resulting in a non-convex problem. We propose an iterative algorithm to achieve a suboptimal and efficient solution to this challenging problem by leveraging the inner approximation framework. Numerical results demonstrate that the proposed algorithm outperforms the traditional direct current computing and other baseline schemes.

中文翻译：

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多对无线供电中继系统中速率公平性的优化

这封信考虑了多对解码转发中继网络，其中在能量受限中继采用功率分配 (PS) 协议来同时提供无线信息和能量收集 (EH)。为了实现更高的 EH 效率，我们通过结合交流电 (AC) 计算逻辑在继电器处提出了一种新的基于 PS 的 EH 架构，该逻辑用于直接将无线收集的 AC 能量用于计算块。在非线性 EH 电路下，我们的目标是最大化受功率约束的用户对之间端到端速率的公平性，从而导致非凸问题。我们提出了一种迭代算法，通过利用内部近似框架来实现对这一具有挑战性的问题的次优且有效的解决方案。