信号–误差恒模算法在盲自适应波束形成中的应用

An Application of Sign-Error Constant Modulus Algorithm to Blind Adaptive Beamforming

摘要: 提出了一种信号–误差恒模(CM)算法。用Godard恒模算法推导出来的权值迭代公式中的误差用一个变化的信号来代替。信号–误差恒模算法的优点是权值计算公式的乘积被一个信号变化代替，并且如果步长选择为2的一个负幂，那么乘法就被一个移位操作代替，这很容易快速实现。计算机仿真表明，信号–误差CM算法比Godard CM算法不仅快速收敛而且跟踪能力强；两种方法抑制了多径但不会使其消失，信号–误差CM算法的抑制能力更强一些。

Abstract: In the adaptive beamforming technology, the sign-error constant modulus (CM) algorithm is proposed based on Godard CM algorithm. The coefficient updating formulas are derived using the error of Godard CM algorithm. The advantage of this algorithm is that the multiplication is replaced by a sign change, and if step size is chosen as a negative power of 2, then the multiplication is replaced by a shifting operation that is easy and fast to implement. Computer simulations show that the sign-error CM algorithm has just a little faster convergence and better ability for acquisition and tracking of desired signal. Two CM algorithm are able to cancel interferences arriving from other than the look direction.