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This paper is concerned with m -ary communication channels (m 2) having intersymbol interference between L time periods (L 2). Receiver structures are developed for making jointly optimum (minimum probability of error) decisions about L consecutive symbols on the basis of the complete message received. The decision statistics are computed by a sequential procedure, and the number of computations increases only linearly with the message length. The method can be applied to the general problem of making decisions about the states of a discrete-state Markov information source which is observable only through a channel with additive Gaussian or non-Gaussian noise.
Chang et al. (Sat,) studied this question.