一种基于两点式散射模型的DOA估计算法

基于天线阵列波达方向(DOA)的波束形成算法是智能天线的率,计算量,对噪声的敏感性或者需要空间搜索等方面存在不足,需要加以改进.在分析宏小区散射模型的基础上,将原来的离散分布简化为两点式分布,并分析了简化为两点式分布的依据.在此基础上,利用两点式分布的数学模型,通过构造相应的二阶统计量,较有效地估计出了空间波达方向及其散布角.并且该算法可以得到闭式解,有效地降低了DOA估计的运算量.所利用的统计量对等方差的白噪声不敏感.理论分析表明,只要快拍数足够多或信噪比较高,该闭式解可以得到很高的估计精度.计算机仿真验证了该算法的有效性.

DOA estimation for scattering model based on binomial distribution

Using a beamforming algorithm based on direction of arrival(DOA) estimation is a key technique employed by so-called smart antennas. However,the algorithm has shortcomings because spatial resolution is insufficient,the computational effort is significant,sensitivity to noise is not ignored,and the spatial spectrum peaks search is fuzzy.Offered here is a simplified original discrete distribution to binomial distribution and a scattering model of the macro-cell.Utilizing the mathematical model of binomial distribution according to second order statistics provides an efficient estimate of the spatial arrival of the angle and the angle spread.This method provides a closed-form solution and reduces the computational load of DOA estimation.The calculations are not sensitive to white noise with equal-variance.Theoretical analysis indicates very high estimation accuracy of this closed-form solution and computer simulation verifies the efficiency of the algorithm.