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arXiv 1606.07232cs.ITmath.IT
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具有能量反馈的分布式无线功率传输

Distributed Wireless Power Transfer with Energy Feedback

Seunghyun Lee, Rui Zhang

摘要:

能量波束成形(EB)是实现高效射频(RF)传输使能的无线能量传输(WET)的关键技术。通过优化设计来自无线信道上的多个能量发射器(RF)的波形,它们可以在能量接收器(ER)处相结合,以实现与RF数量成比例的EB增益。然而,EB波形的最佳设计需要精确的信道状态信息(CSI)在双工器,这是具有挑战性的,实际上,特别是在分布式系统与双工器在不同的位置。在本文中,我们研究了实用和有效的信道训练方法,以实现最佳EB在分布式WET系统。我们提出了两个协议,有和没有集中式协调,分别,分布式的分布式路由器顺序或并行调整其传输阶段的基础上,从ER的低复杂度的能量反馈。能量反馈仅取决于ER处的接收功率电平,其中每个反馈指示一个特定的发射相位,其导致在一组先前使用的相位上的最大收获功率。仿真结果表明,这两个建议的训练协议收敛非常快,在实际的WET系统中,即使有大量的分布式均衡器,而顺序ET相位自适应协议也分析表明,通过增加训练时间收敛到最优EB设计与完美的CSI。数值结果也提供了评估性能的建议分布式EB和培训设计相比,其他基准计划。

英文摘要:

Energy beamforming (EB) is a key technique for achieving efficient radio-frequency (RF) transmission enabled wireless energy transfer (WET). By optimally designing the waveforms from multiple energy transmitters (ETs) over the wireless channels, they can be constructively combined at the energy receiver (ER) to achieve an EB gain that scales with the number of ETs. However, the optimal design of EB waveforms requires accurate channel state information (CSI) at the ETs, which is challenging to obtain practically, especially in a distributed system with ETs at separate locations. In this paper, we study practical and efficient channel training methods to achieve optimal EB in a distributed WET system. We propose two protocols with and without centralized coordination, respectively, where distributed ETs either sequentially or in parallel adapt their transmit phases based on a low-complexity energy feedback from the ER. The energy feedback only depends on the received power level at the ER, where each feedback indicates one particular transmit phase that results in the maximum harvested power over a set of previously used phases. Simulation results show that the two proposed training protocols converge very fast in practical WET systems even with a large number of distributed ETs, while the protocol with sequential ET phase adaptation is also analytically shown to converge to the optimal EB design with perfect CSI by increasing the training time. Numerical results are also provided to evaluate the performance of the proposed distributed EB and training designs as compared to other benchmark schemes.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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