STAR-RIS Assisted Wireless Communications With Discrete Phase Shifter

IF 5.5 3区计算机科学 Q1 COMPUTER SCIENCE, INFORMATION SYSTEMS IEEE Wireless Communications Letters Pub Date : 2024-09-10 DOI:10.1109/LWC.2024.3456835

Yaxuan Liu;Yiyang Ni;Haitao Zhao;Yuting Yang;Shen Qiao;Hongbo Zhu

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Abstract

Reconfigurable Intelligent Surface (RIS) presents a promising solution for achieving a balance between communication quality and power consumption. However, traditional reflecting RIS designs are limited to covering signals within a 180-degree range. Fortunately, the development of Simultaneous Transmitting and Reflecting RIS (STAR-RIS) technology enables the simultaneous transmission and reflection of signals, allowing for 360-degree coverage. In this letter, we investigate the STAR-RIS assisted wireless communications under Nakagami-m fading channels, and the channel state information (CSI) is assumed perfectly obtained. Considering the hardware design complexity, the RIS phase shifts are discretely configured with quantization errors. We derive the closed-form expressions of the outage probability and the ergodic achievable rate under the discrete phase. In addition, the approximations for the special cases including the random phase case, the continuous phase case, the Rayleigh fading case, as well as the high signal-noise ratio (SNR) case are further deduced. Numerical results verify the correctness of the analytical results.

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使用离散移相器的 STAR-RIS 辅助无线通信

可重构智能表面（RIS）为实现通信质量和功耗之间的平衡提供了一种前景广阔的解决方案。然而，传统的反射式 RIS 设计仅限于覆盖 180 度范围内的信号。幸运的是，"同时发射和反射可视化集成系统"（STAR-RIS）技术的发展实现了信号的同时发射和反射，从而实现了 360 度覆盖。在这封信中，我们研究了 Nakagami-m fading 信道下的 STAR-RIS 辅助无线通信，并假定信道状态信息（CSI）是完美获得的。考虑到硬件设计的复杂性，RIS 相移采用量化误差离散配置。我们推导出了离散相位下的中断概率和遍历可实现率的闭式表达式。此外，我们还进一步推导了随机相位、连续相位、瑞利衰减以及高信噪比（SNR）等特殊情况下的近似值。数值结果验证了分析结果的正确性。

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来源期刊

IEEE Wireless Communications Letters Engineering-Electrical and Electronic Engineering

CiteScore

12.30

自引率

6.30%

发文量

481

期刊介绍： IEEE Wireless Communications Letters publishes short papers in a rapid publication cycle on advances in the state-of-the-art of wireless communications. Both theoretical contributions (including new techniques, concepts, and analyses) and practical contributions (including system experiments and prototypes, and new applications) are encouraged. This journal focuses on the physical layer and the link layer of wireless communication systems.