Performance of Coded Modulation on lntersymbol Interference Channelsc

The bandwidth efficiency of coded modulation coupled with high coding gains over equivalent uncoded schemes has rendered the concept attractive for application in many practical communication systems. In this paper, we examine the performance by simulation, of TCM, MTCM and BCM on IS1 channels. Simulations were performed assuming the receiver operates on the received signal using decision feed-back equalization in conjunction with the Viterbi decoder. Results indicate that coded modulation schemes may be viable in systems that require low throughput rates. Coded schemes experience performance losses, however, in sys-tems that require higher throughput rates mainly because the equalization process cannot adequately reduce the dis-tortion induced by the channel, and the Viterbi decoder is unable U, operate on the distorted signal. 1