一种变步长LMS波束形成算法性能研究

智能天线的自适应算法通过迭代运算获取波束形成的最优权值矢量时，收敛速度和稳态误差是衡量一个算法是否优良的关键因素。它们的好坏直接影响着系统波束形成的性能。系统地分析了传统的最小均方（LMs）算法的收敛速度以及稳态误差的性能，在此基础上提出了一种新的变步长LMS算法，将此算法应用于波束形成，并用Matlab软件进行仿真。仿真结果表明，改进后的算法较传统LMS具有较快的收敛速度和较小的稳态误差。

Performance Study of Variable Step-size LMS Beam Forming Algorithm

The adaptive algorithm of smart antenna achieves the best weight vector for beam forming by iterative means, the convergence rate and steady state error directly influence the beam forming. The performance of the traditional LMS algorithm is analyzed. A new variable step-size algorithm is proposed and applied to beam forming with the Matlab. The simulation result indicates that the improved algorithm can achieve faster convergence and lower steady state error than the traditional LMS.