基于斜投影及先验信息的波达方向估计算法

提出一种应用于正交频分复用智能天线系统中的波达方向估计算法。该算法利用实际环境中基站与周围建筑物之间已知的角度信息，基于MUSIC算法的最小二乘思想，引入斜投影算子估计未知角度。理论和仿真实验证明，该算法是对未知角度的无偏估计，适用于分辨与已知角度相差很小的未知角度值，较传统的MUSIC算法有明显优势。

Direction of Arrival Estimation Algorithm Based on Oblique Projections and Prior Information

This paper proposes an algorithm of Direction of Arrival(DOA) estimation in the Orthogonal Frequency Division Multiplexing(OFDM) system. It uses the priori knowledge of angle between the base stations and the buildings around it with oblique projection operator to estimate the unknown angle based on the Least Squares(LS) ideas of MUSIC algorithm. It is proved that the algorithm is the unbiased estimation only for the unknown angles from the view of theory and simulation. Result is free from the priori information, and it is fit for distinguishing the small difference from the known angle, so it outperforms the traditional MUSIC algorithm.