改进变步长算法的空时抗干扰处理技术  

The Space-Time Interference Technical Baesd on a New Variable Step Algorithm

作　　者：李灯熬[1] 刘金强[1] 赵菊敏[1] 

机构地区：[1]太原理工大学信息工程学院,山西太原030024

出　　处：《计算机仿真》2016年第8期218-222,共5页Computer Simulation

基　　金：国家自然科学基金青年科学基金项目(61303207);国家自然科学基金面上项目(61371062);教育部2012年高等学校博士学科点专项科研基金联合资助课题(20121402120020)

摘　　要：针对传统的空时联合抗干扰技术在协方差矩阵求逆过程中计算量大,对处理器的要求高的缺点,提出了一种新的变步长最小均方误差(VSS-LMS)算法。改进算法采用两步迭代的方式进行阵列加权值的计算,在收敛的初始阶段,利用误差自相关值的双曲正切函数来调整步长,以达到快速收敛目的;收敛后期,则利用前一步长因子与误差自相关值的线性关系来调整步长,以保持较小的稳态误差。仿真表明,改进算法不仅能显著降低计算量,而且与经典的LMS算法相比,收敛速度和精度均得到明显提高;与传统的递归最小二乘算法(RLS)性能相近。充分说明了算法的有效性。In view of the disadvantages of large calculation and the high demand of the processor in the space-time joint anti-jamming technology process,an improved variable step size least mean square error algorithm was proposed in this paper. In the initial stages of convergence,we used the hyperbolic tangent function of error autocorrelation value to adjust the step size,in order to achieve rapid convergence; in the late stages of convergence,we used the factors of previous steps and error correlation values to adjust the step size,in order to maintain a small steady-state error. The simulation results show that the convergence speed and convergence accuracy of the improved algorithm are significantly improved compared with the classical LMS algorithm,and the improved algorithm performance is similar to the RLS algorithm. The effectiveness of the algorithm was demonstrated.

关 键 词：空时联合处理 协方差矩阵 误差自相关值 

分 类 号：TN97[电子电信—信号与信息处理]