一种新的变步长恒模盲均衡算法

针对固定步长恒模盲均衡算法在收敛速度和稳态剩余误差之间存在的问题,在应用变步长的思想基础上,利用均方误差的变换作为控制步长的因子,提出了一种新的自适应时变步长恒模盲均衡算法(VASCMA).对新算法进行了理论分析和计算机仿真,仿真时采用两种不同的调制信号通过三种不同信道,得到两种算法的均方误差的收敛曲线和收敛后均衡器输出的星座图,仿真结果均表明,改进算法具有较快的收敛速度和较小的剩余误差.

A New Constant Modulus Blind Equalization Algorithm of Variable Step-size

For the problem existed in between convergence rate and convergence precision, of fixed step- size constant module blind equalization algorithm, this paper, based on variable step-size thought and with MSE （mean square error） transform as the step-size control factor, proposes an new adaptive variable step-size constant module blind equalization algorithm. Theoretical analysis and computer simulation are done on the new algorithm, and two different modulation signals passing through the three different channels are adopted in the simulation, thus the constellation figures and MSE curves aftere qualization are obtained. Computer simulation indicates that the proposed algorithm is of fairly low complexity, fast convergence, and low computational error.