论文标题
基于一位可重构的智能表面的低成本波束形成和DOA估算
Low-Cost Beamforming and DOA Estimation Based on One-Bit Reconfigurable Intelligent Surface
论文作者
论文摘要
在这项工作中，我们在低成本体系结构中考虑了到达方向（DOA）的估计问题，在低成本体系结构中，只有一个天线作为接收器得到可重构智能表面（RIS）的帮助。我们引入了一位RI作为信号反射器，以增强非视线（NLOS）情况下的信号传输，并实质上简化了DOA估计的物理硬件。我们优化了称为测量矩阵的光束成型方案，以将回波功率集中在接收器上，而目标的粗定位信息作为先验。提出了基于修改的遗传算法的光束成型方案，以优化测量矩阵，确保限制的等轴测特性（RIP）并满足单光波形的要求。通过解决基于原子 - 基因的稀疏重建问题，可以很好地估计DOA结果。仿真结果表明，所提出的方法在DOA估计性能中的现有方法优于现有方法。
In this work, we consider the Direction-of-Arrival (DOA) estimation problem in a low-cost architecture where only one antenna as the receiver is aided by a reconfigurable intelligent surface (RIS). We introduce the one-bit RIS as a signal reflector to enhance signal transmission in non-line-of-sight (NLOS) situations and substantially simplify the physical hardware for DOA estimation. We optimize the beamforming scheme called measurement matrix to focus the echo power on the receiver with the coarse localization information of the targets as the prior. A beamforming scheme based on the modified genetic algorithm is proposed to optimize the measurement matrix, guaranteeing restricted isometry property (RIP) and meeting single beamforming requirements. The DOA results are finely estimated by solving an atomic-norm based sparse reconstruction problem. Simulation results show that the proposed method outperforms the existing methods in the DOA estimation performance.
