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首页> 外文期刊>Journal of communications and networks >Optimal wireless power transfer with distributed transmit beamforming
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Optimal wireless power transfer with distributed transmit beamforming

机译：分布式发射波束成形的最佳无线电力传输

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摘要

This paper considers the performance of wireless power transfer (WPT) with distributed transmit beamforming (DTB) in a narrowband setting. One or more receive nodes, each equipped with energy harvesting and storage capabilities, provide periodic channel state feedback to a cluster of transmit nodes, each with an independent local oscillator, to facilitate beamforming and passband signal alignment for efficient WPT. Without channel state feedback, the transmit cluster can not align the passband signals at the receivers and the receivers can only harvest incoherent power. Since feedback improves the beamforming gain but requires the receivers to expend energy, there is a fundamental tradeoff between the feedback period and the energy harvesting efficiency. This paper analyzes the optimal feedback period to maximize the weighted mean energy harvesting rate as a function of the oscillator parameters. An optimization problem is formulated and an explicit method to numerically calculate the globally optimal feedback period is developed. Numerical results are provided to confirm the analysis and demonstrate the sensitivity of the weighted mean energy harvesting rate with respect to the feedback period and the DTB system parameters.
机译：本文考虑了在窄带环境下采用分布式发射波束成形（DTB）的无线电力传输（WPT）的性能。一个或多个接收节点（每个节点都具有能量收集和存储功能）向一组发射节点（每个节点都具有独立的本地振荡器）提供周期性的信道状态反馈，以促进波束成形和通带信号对准，以实现有效的WPT。如果没有信道状态反馈，则发射群集无法在接收器处对齐通带信号，并且接收器只能收获非相干功率。由于反馈改善了波束成形增益，但需要接收器消耗能量，因此在反馈周期和能量收集效率之间存在根本的权衡。本文分析了最佳反馈周期，以使加权平均能量收集率最大化，这是振荡器参数的函数。提出了一个优化问题，并提出了一种数值计算全局最优反馈周期的显式方法。提供了数值结果以确认分析并证明加权平均能量收集率相对于反馈周期和DTB系统参数的敏感性。

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