Distributed Hybrid Active-Passive RIS-Assisted THz Wireless Systems: Performance Analysis and Optimization

IF 8.3 2区计算机科学 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC IEEE Transactions on Communications Pub Date : 2024-08-27 DOI:10.1109/TCOMM.2024.3450791

Ngoc Phuc Le;Mohamed-Slim Alouini

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Abstract

In this paper, we propose distributed hybrid active-passive reconfigurable intelligent surfaces (H-RIS) for Terahertz (THz) wireless communication systems in the presence of hardware impairments and

$\alpha -\mu $

small-scale fading. At first, the end-to-end channel is characterized by a gamma distribution approximation by means of the Lyapunov-central limit theorem. Based on this, analytic expressions of the outage probability and the ergodic capacity of the system are derived. Also, the scaling-law for the received signal-to-noise ratio (SNR) is analyzed in association with the H-RIS scheme, in comparison with fully active RIS and fully passive RIS counterparts. Next, the transmit power is optimized to achieve maximum energy-efficiency in practical scenarios where only partial channel state information (CSI) is available. Furthermore, impacts of hardware impairments, RIS phase-shift errors, as well as numbers of active and passive RIS elements on the system performance are evaluated. Finally, simulations are provided to validate the accuracy of the theoretical analysis.

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分布式有源-无源混合 RIS 辅助太赫兹无线系统：性能分析与优化

在本文中，我们提出了用于太赫兹（THz）无线通信系统的分布式混合主动式无源可重构智能表面（H-RIS），用于存在硬件损伤和$\alpha -\mu $小规模衰落的情况。首先，利用李雅普诺夫中心极限定理对端到端信道进行了伽玛分布近似表征。在此基础上，导出了系统停机概率和遍历容量的解析表达式。此外，与全主动RIS和全被动RIS相比较，分析了与H-RIS方案相关的接收信噪比（SNR）的标度律。接下来，对发射功率进行优化，以便在只有部分信道状态信息（CSI）可用的实际场景中实现最大的能效。此外，还评估了硬件缺陷、RIS相移误差以及主动和被动RIS元件数量对系统性能的影响。最后通过仿真验证了理论分析的准确性。

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来源期刊

IEEE Transactions on Communications 工程技术-电信学

CiteScore

16.10

自引率

8.40%

发文量

528

审稿时长

4.1 months

期刊介绍： The IEEE Transactions on Communications is dedicated to publishing high-quality manuscripts that showcase advancements in the state-of-the-art of telecommunications. Our scope encompasses all aspects of telecommunications, including telephone, telegraphy, facsimile, and television, facilitated by electromagnetic propagation methods such as radio, wire, aerial, underground, coaxial, and submarine cables, as well as waveguides, communication satellites, and lasers. We cover telecommunications in various settings, including marine, aeronautical, space, and fixed station services, addressing topics such as repeaters, radio relaying, signal storage, regeneration, error detection and correction, multiplexing, carrier techniques, communication switching systems, data communications, and communication theory. Join us in advancing the field of telecommunications through groundbreaking research and innovation.