Application of SSE to detection of TCM on multipath fading ISI channels

A novel receiver structure for trellis coded modulation on multipath fading ISI (intersymbol interference) channels that permits the use of large-state trellis-codes is proposed. The receiver consists of a sequential sequence estimator using the Fano algorithm, and a channel estimator consisting of a fast nonrecursive startup algorithm for training and the LMS (least mean square) algorithm for tracking. During the tracking mode, the channel estimates are updated by using the most recent tentative decisions output by the sequential sequence estimator. This approach results in good tracking even on rapidly varying channels and greatly reduces the degradation in performance of the sequential sequence estimator due to channel estimation error. Performance is evaluated through software simulations