SEQUENTIAL SEQUENCE ESTIMATION FOR MULTIPLE-CHANNEL SYSTEMS WITH INTERSYMBOL AND INTERCHANNEL INTERFERENCE

A vector sequential sequence estimator is proposed for multiple-channe l transmission systems with both intersymbol interference (ISI) and in terchannel interference (ICI). Both finite ISI-ICI and infinite ISI-IC I are considered. The estimator consists of a multiple-dimensional whi tened matched filter and a vector sequential decoder. The metric of th e sequential algorithm is derived and the algorithm's performance anal ysis is given. Computer simulation results for a two-dimensional finit e ISI-ICI channel and a two-dimensional infinite ISI-ICI channel are p resented. Analysis and simulation show that the symbol error probabili ty of the vector sequential algorithm is essentially the same as maxim um likelihood sequence estimation via the vector Viterbi algorithm (VA ), while its average computational complexity is much less, although c omputation per symbol is a random variable with the Pareto distributio n. There exists a signal-to-noise ratio SNR(comp) above which the ense mble average computation is bounded. An upper bound on the SNR(comp) i s found.