This paper presents an investigation of two basic schemes of channel estimation/prediction and decision-feedback equalization (DFE) for moderately rapid fading dispersive HF-channcls.Simulation results show that non-adaptive adjustment of DFE coefficients by direct calculation from the estimated channel impulse response has the potential of being significantly more robust against channel time variations than a DFE employing adaptive coefficient tracking.Receiver performance is now limited by the quality of the channel estimate rather than the equalizer'sadaptive algorithm.An optimized state-of-the-art adaptive estimator/predictor featuring individual adaptation of channel coefficients is shown to recover part of the potential performance gain;for additional improvements further work needs to be directed towards more advanced channel estimation schemes.
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