PERFORMANCE OF TRELLIS-CODED MODULATION FOR EQUALIZED MULTIPATH-FADING ISI CHANNELS

The performance of TCM on equalized multipath fading ISI channels with different equalization schemes is examined, Trellis codes that are ef fective for AWGN channels and Bat fading channels with interleaving ar e evaluated for equalized multipath fading channels, For joint MLSE eq ualization and decoding the equivalent uncoded system outperforms all the trellis-coded systems that are examined, Trellis codes that are de signed for flat fading channels with interleaving perform well if inte rleaving is used and an MLSE equalizer is used before deinterleaving. An effective interleaver-deinterleaver is identified that allows joint DDFSE equalization and decoding to be used without the need for equal ization before decoding.