In this paper, a blind maximum-likelihood channel estimationalgorithm is developed for quadrature partial response-trellis codedmodulated(QPR-TCM)signals propagating through Rican fadingenvironment. A hidden Markov model(HMM)formulation of the problem isintroduced and the Baum-Welch parameter Estimation algorithm ismodified to provide a computationally efficient solution to theresulting optimiza- Tion problem.
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