论文标题
可重新配置的智能表面辅助稀疏DOA估计方法
Reconfigurable Intelligent Surface Aided Sparse DOA Estimation Method With Non-ULA
论文作者
论文摘要
本信中解决了到达方向（DOA）估计问题。提出了可重新配置的智能表面（RIS）辅助系统，以进行DOA估计。与传统的DOA估计系统不同，通过更改RIS元素上反射信号的阶段以实现多个测量值，给出了一个只有一个完整功能接收器的低成本系统。此外，提出了一种基于原子规范的方法来用于DOA估计，通过利用空间域中的目标稀疏性并通过半明确编程（SDP）方法求解。此外，RIS元素可以是任何几何阵列以进行实际考虑，因此制定了转换矩阵，并且与常规的SDP方法不同。仿真结果表明，所提出的方法比不均匀的线性RIS阵列中的现有方法更准确地估计DOA。
The direction of arrival (DOA) estimation problem is addressed in this letter. A reconfigurable intelligent surface (RIS) aided system for the DOA estimation is proposed. Unlike traditional DOA estimation systems, a low-cost system with only one complete functional receiver is given by changing the phases of the reflected signals at the RIS elements to realize the multiple measurements. Moreover, an atomic norm-based method is proposed for the DOA estimation by exploiting the target sparsity in the spatial domain and solved by a semi-definite programming (SDP) method. Furthermore, the RIS elements can be any geometry array for practical consideration, so a transformation matrix is formulated and different from the conventional SDP method. Simulation results show that the proposed method can estimate the DOA more accurately than the existing methods in the non-uniform linear RIS array.
