Combined Channel Estimation and Data Detection Using Soft Statistics for Frequency-Selective Fast-Fading Digital Links

A novel adaptive nonlinear equalizer for fast timevarying multipath channels that combines the channel-estimation and data-detection tasks is presented. The a posteriori probabilities (APP’s) of he states of the intersymbol interference (ISI) channel are recursively computed from the received data by a symbol-by-symbol (SbS) detector [7] and are then employed by a Kalman-type nonlinear channel estimator. Robust channel tracking and good data-detection performance are obtained, with a reasonable receiver complexity