Reconfigurable Intelligent Surfaces With Reflection Pattern Modulation: Beamforming Design and Performance Analysis
Reconfigurable Intelligent Surfaces With Reflection Pattern Modulation: Beamforming Design and Performance Analysis
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DOI：
10.1109/twc.2020.3028198
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发表时间：
2021-02-01
影响因子：
10.4
通讯作者：
Chen, Fangjiong
中科院分区：
文献类型：
--
作者：
Lin, Shaoe;Zheng, Beixiong;Chen, Fangjiong
最近的研究表明，可重构智能表面（RISs）可以通过智能反射同时执行被动波束形成和信息传输（PBIT）。在本文中，我们提出了一种增强的多输入单输出系统与反射模式调制（RPM），以实现PBIT，其中联合主动和被动波束成形仔细设计，考虑到通信中断概率。我们制定了一个优化问题，以最大限度地提高平均接收信号功率，通过联合优化的主动波束形成在接入点（AP）和被动波束形成在RIS的假设下，RIS的状态信息是统计已知的AP，并提出了一个高质量的次优解决方案的基础上交替优化技术。此外，一个封闭形式的表达所提出的计划在莱斯衰落的渐近中断概率。所提出的方案的可实现的速率也调查的假设下，发送的符号是从一个有限的星座。仿真结果验证了该方案的有效性，并揭示了各种系统参数对可达速率的影响。结果表明，该方案优于，在可实现的速率，传统的RIS辅助系统，没有信息传输。
Recent research on reconfigurable intelligent surfaces (RISs) suggests that RISs can perform passive beamforming and information transfer (PBIT) simultaneously via smart reflections. In this paper, we propose an RIS-enhanced multiple-input single-output system with reflection pattern modulation (RPM) to achieve PBIT, where the joint active and passive beamforming is carefully designed by taking into account the communication outage probability. We formulate an optimization problem to maximize the average received signal power by jointly optimizing the active beamforming at the access point (AP) and passive beamforming at the RIS under the assumption that the RIS's state information is statistically known by the AP, and propose a high-quality suboptimal solution based on the alternating optimization technique. Moreover, a closed-form expression for the asymptotic outage probability of the proposed scheme in Rician fading is derived. The achievable rate of the proposed scheme is also investigated under the assumption that the transmitted symbols are drawn from a finite constellation. Simulation results validate the effectiveness of the proposed scheme and reveal the effect of various system parameters on the achievable rate. It is shown that the proposed scheme outperforms, in terms of achievable rate, the conventional RIS-assisted system without information transfer.