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对于高阶 QAM信号 ,常数模算法的收敛误差不为零 ,而多模算法的收敛速度慢。提出了一种混合常数模算法 ,并将该算法应用于水声信道盲均衡。该算法根据均衡器输出信号模值与其判决模值之间的距离 ,设置一判决域。根据该判决域 ,算法的迭代过程在常数模和多模算法之间自动切换 ,且收敛后自动切换到多模算法。该算法收敛速度快 ,且均方误差小 ,特别适合于高阶 QAM信号的盲均衡。通过对水声信道盲均衡的计算机仿真 ,验证了该算法的优点及对多途干扰抑制的有效性。
For high-order QAM signals, the convergence error of the constant modulus algorithm is not zero, but the convergence rate of the multi-mode algorithm is slow. A hybrid constant modulus algorithm is proposed and applied to underwater acoustic channel blind equalization. The algorithm sets a decision field according to the distance between the equalizer output signal modulus and its decision modulus. According to the decision domain, the iterative process of the algorithm automatically switches between the constant modulus and the multi-mode algorithm, and automatically switches to the multi-mode algorithm after convergence. The algorithm has high convergence rate and small mean square error and is especially suitable for blind equalization of high order QAM signals. Through the computer simulation of the underwater acoustic channel blind equalization, the advantages of this algorithm and the effectiveness of the multi-path interference suppression are verified.