不完美中上信道信息下具有能量收集功能的可重构智能表面辅助通信系统的性能分析

Q2 Engineering
Hữu Quý Trần, Ho Van Khuong
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引用次数: 0

摘要

可重构智能表面(RIS)可作为无源中继器,在收发器之间没有直接联系的严重情况下保持通信。此外,从射频(RF)信号中收集能量可以显著提高能效。在这项研究中,我们提出了具有能量收集功能的射频识别系统辅助通信系统(RISwEH),该系统结合了射频识别系统和射频能量收集功能,可提高能量效率和通信可靠性。为了真实、快速地评估 RISwEH 的性能,我们提出了在 Nakagami-m fading 和不完善信道状态信息(CSI)的实际情况下系统吞吐量和中断概率的明确公式。此外,我们还提出了一种基于黄金分割搜索的优化算法,以达到能量收集器时间分割因子的最佳值,从而获得最佳的系统性能。各种结果证实了理论推导,证实了所提优化算法的有效性,并说明了无数系统设置对系统性能的影响。特别是,不完善的 CSI 会大大降低系统性能。然而,RISwEH 的性能可以通过增加 RIS 的元素数量以及降低衰减严重程度来提高。此外,时间分割因子也会对 RISwEH 的中断性能产生重大影响,其最佳值可显著降低中断概率。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Performance Analysis for Reconfigurable Intelligent Surface-aided Communication Systems with Energy Harvesting under Imperfect Nakagami-m Channel Information
Reconfigurable intelligent surface (RIS) can serve as a passive relay to maintain communication between a transceiver in severe scenarios of no direct link between them. In addition, harvesting energy from radio frequency (RF) signals can meliorate significantly energy efficiency. In this research, we propose RIS-aided communication systems with energy harvesting (RISwEH) which combine both RIS and RF energy harvesting to improve energy efficiency as well as communication reliability. To evaluate realistically and quickly the performance of the RISwEH, we propose the explicit formulas of the system throughput and the outage probability under the realistic scenario of Nakagami-m fading and imperfect channel state information (CSI). Moreover, we propose an optimization algorithm relied upon a Golden section search to attain the optimum value of the time splitting factor of energy harvester to obtain the best system performance. Various results corroborate the theoretical derivations, confirm the efficacy of the proposed optimization algorithm, and illustrate the influence of innumerable system settings on the system performance. Particularly, the imperfect CSI deteriorates considerably the system performance. Nonetheless, the performance of the RISwEH can be enhanced by accreting the quantity of the elements of the RIS as well as with the lower fading severity. Furthermore, the time splitting factor also impacts dramatically the outage performance of the RISwEH and its optimal value mitigates significantly the outage probability.
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