Systematic Trellis-coded Modulation on Multipath Fading ISI Channels

Abstract

The concept of systematic trellis-coded modu- lation (STCM) is presented as an effective means of performing coded modulation on multipath fading IS1 channels. Due to the special construction of STCM codes, a dual mode receiver can be employed; conventional sequence estimation is used when the channel is satisfactory, and systematic decoding is used when the channel exhibits a deep fade. Because the bit error rate is dominated by the code performance during a deep fade, STCM codes with even a modest asymptotic coding gain have an over- all performance that is better than previously reported trellis- codes with large asymptotic coding gain. I Introduction