Abstract
AbstractIn high bit‐rate mobile communication, selective fading due to multipath phenomena is one of the causes of communication quality degradation. In selective fading, a time‐varying intersymbol interference occurs.This paper discusses the suitable trellis‐coded modulation code for the channel. Two design rules are discussed: one is to maximize the minimum value of the average squared Euclidean distance between sequences over fading; and the other is to maximize the averaged value of the minimum distance between received sequences over fading and information sequences.Both rules conclude that the optimum code for the Gaussian channel without fading also is optimum for the selective fading channel, that is, the code with the maximum free Euclidean distance is optimum for the fading channel. Simulation results show that the codes designed by the rules give the effective coding gain and the design method is useful.The decoding complexity increases exponentially depending on the sum of the code constraint length and the length of intersymbol interference. To lighten the decoding burden, a simplified decoding method of a decreased survival path is proposed.
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