一种改进的加权多模盲均衡算法

Improved Weighted Multi-modulus Blind Equalization Algorithm

数字有线电视主要采用QAM调制形式。针对QAM调制信号的特点,在加权多模盲均衡算法的基础上,引入Sigmoid函数的变形,提出了一种加权值随均方误差自适应变化的新算法。新算法不需要设定模式转变的门限值,使算法模式从MCMA随均衡输出自适应转化为DD模式。通过仿真表明该算法与多模盲均衡算法(WMMA)相比降低了仿真复杂度,具有更稳定的收敛性能,适应于高阶QAM信号。

The Quadrature Amplitude Modulation（QAM） signal is used in digital cable TV. In view of the characteristics of the QAM signal, an improved weighted multi - modulus blind equalization algorithm is proposed based on the change of sigmoid formula. The mode of the new algorithm is converted from MCMA to DD without setting the threshold of mode change. The simulation results show that the method comparing with WMMA is better not only on lower complexity, but also on convergence, and it is suitable for high-order QAM signals.