Efficient Direction-of-Arrival Estimation Method Based on Variable-Step-Size LMS Algorithm
Efficient Direction-of-Arrival Estimation Method Based on Variable-Step-Size LMS Algorithm
复制标题
基于变步长LMS算法的高效波达方向估计方法
DOI：
10.1109/lawp.2019.2923700
复制
发表时间：
2019-08-01
影响因子：
4.2
通讯作者：
Sarkar, Tapan K.
中科院分区：
文献类型：
--
作者：
Jalal, Babur;Yang, Xiaopeng;Sarkar, Tapan K.
传统的基于子空间分解的波达方向（DOA）估计方法计算复杂，难以实现。固定步长的最小均方（FSS-LMS）DOA估计算法虽然克服了这一复杂性问题，但人工选择合适的步长是困难的。本文提出了一种变步长LMS算法用于DOA估计。该方法利用估计的信号功率和累积瞬时误差平方和来更新步长，利用阵列方向图的倒数来获得空间谱，其中峰值表示信号的DOA估计值。该方法可以自适应地选择步长，以较低的计算复杂度提供更好的性能。通过数值仿真验证了该方法的性能，并与现有的一些方法进行了比较。
Conventional direction-of-arrival (DOA) estimation methods based on subspace decomposition are computationally complex and difficult to implement in practical applications. Although a fixed-step-size least mean square (FSS-LMS) algorithm for DOA estimation has overcome the complexity problem; however, the manual selection of suitable step size is difficult. In this letter, a variable-step-size LMS algorithm is proposed for DOA estimation. In the proposed method, the step size is updated by using the estimated signal power and the cumulative sum of squared instantaneous error, and the spatial spectrum is obtained by the reciprocal of array pattern, where the peak values indicate the estimated DOAs of signals. The proposed method can choose step size adaptively and provide better performance with low computational complexity. The performance of proposed method is verified by the numerical simulations and compared with some existing methods.