A new soft-decision adaptive decoding algorithm for space-time trellis code (STTC) is proposed.With a bidirectional decoding (BD) structure
the proposed algorithm fully utilizes the preambles of adjacent TDMA downlink slots and produces high-quality soft-decision output.Besides
two-step Least-Mean-Square (TSLMS) algorithm is developed to implement simple but effective channel tracking in each unidirectional decoding.Computer simulation results are given to support our development.