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arXiv 2406.05552eess.SP
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RIS辅助的OAM-SWIPT联合反射与功率分割优化

Joint Reflection and Power Splitting Optimization for RIS-assisted OAM-SWIPT

Runyu Lyu, Wenchi Cheng

AI总结:

本文针对视距信道强相关限制SWIPT效率的问题,提出RIS辅助的OAM-SWIPT传输方案,通过交替优化联合求解最优反射系数与功率分割比,实现容量与能量收集的权衡提升。

摘要:

无线信息与能量同传(SWIPT)能够提升无线通信网络的频谱效率和功率效率。视距(LOS)传输是SWIPT的典型场景。然而,强信道相关性限制了LOS信道中SWIPT的频谱效率和能量效率。由于具有正交波前,轨道角动量(OAM)波能够促进LOS信道中的SWIPT。在可重构智能表面(RIS)的辅助下,OAM-SWIPT系统的能量效率和容量都可以得到进一步提升。本文对RIS辅助的OAM-SWIPT传输进行建模,并推导其最优反射系数和功率分割比。我们首先给出系统和信道模型。然后,提出传输方案。基于该传输方案,我们构建容量与能量收集(EH)之间的权衡问题。通过开发交替优化算法求解该问题。仿真验证了RIS为OAM-SWIPT带来的容量和EH提升。

英文摘要:

Simultaneous wireless information and power transfer (SWIPT) can enhance the spectrum and power efficiencies of wireless communications networks. Line-of-sight (LOS) transmission is a typical SWIPT scenario. However, the strong channel correlation limits the spectrum and energy efficiencies of SWIPT in the LOS channel. Due to the orthogonal wavefronts, orbital angular momentum (OAM) waves can facilitate the SWIPT in LOS channels. With the assistance of the reconfigurable intelligent surface (RIS), both the energy efficiency and capacity can be further improved for the OAM-SWIPT systems. In this paper, we model the RIS-assisted OAM-SWIPT transmission and derive the optimal reflection coefficients and power splitting ratio for it. We first give the system and channel models. Then, we propose the transmission scheme. Based on the transmission scheme, we formulate the capacity and energy harvesting (EH) trade-off problem. We solve the problem by developing an alternating optimization algorithm. Simulations validate the capacity and EH enhancements brought by the RIS for OAM-SWIPT.

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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