This paper proposes a modified constant modulus algorithm for blind equalization of time-varying channel. The new algorithms replace constant step-size by the variable step-size that was controlled by the nonlinear transform of residual error. The advantage of the new algorithm is that it has the lower residual error and the faster convergence rate than the constant modulus algorithm. The superior performance of the proposed algorithm is illustrated by the mean square error curve of 8-PAM signal transmitted through time-varying channel. The simulation results demonstrate that an improvement in performance is achieved with the proposed equalization algorithm.
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