Abstract
Trellis codes combine channel coding and modulation techniques for data transmission over band limited channels. Theoretically, it achieves significant coding gains over conventional uncoded multilevel modulation without compromising bandwidth efficiency. In this Chapter, the effect of trellis encoding algorithms are studied, and the effectiveness for Carrier Serving Area (CSA) loop environments in the presence of imperfect echo cancellation at primary rate ISDN applications are evaluated. A basic methodology for the simulation of trellis codes for QAM clusters is utilized. The effect of trellis codes for 16 and 64 QAM is outlined. Results for the coded 16 and 64 QAM constellations for three typical CSA loops with 60 dB of echo cancellations are presented along with the effects of trellis codes on the entire CSA loop population.
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