基于ST-CMA盲均衡算法的直达波提取方法

The Method of Extracting Direct Wave Based on ST-CMA Blind Equalization Algorithm

针对检测系统中直达波信号被多径杂波所淹没的问题,提出了基于变步长的空时二维恒模盲均衡算法的直达波提取方法.该算法不受多径信号时延的限制,因此更具有效性和鲁棒性.在此基础之上采用变步长训练算法,在迭代过程中不断调节步长,使得算法的收敛速度得以提高.对存在不同的多径杂波情况进行了仿真分析,结果表明,新算法可以克服常规算法的缺点,其提取性能明显优于常规算法.

Accoding to the problem of direct wave signal inundated by multipath clutter in inspection system, a direct wave extraction method of space-time two-dimensional CMA blind equalization algorithm based on variable step-length is proposed, the algorithm wasn＇t restricted by muhipath signal delay,so it is more effective and robust. On this basis,the variable step length training algorithm is employed which makes convergence speed of the algorithm improve by adjusting continuously step interval in the iteration process. The results show that the new algorithm can overcome the shortcomings, its extraction performance is superior to original algorithm by simulating the existing multipath clutter.