Published in Ross, M.D., Osborne, W.P., Carden, F., & Stolarczyk, J.L. (1992). Pragmatic trellis coded modulation: a hardware implementation using 24-sector 8-PSK. IEEE International Conference on Communications, 1992. ICC 92, Conference record, SUPERCOMM/ICC '92, Discovering a New World of Communications, v. 3, 1578-1582. doi: 10.1109/ICC.1992.268026 ©1992 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE. This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder.


Trellis Coded Modulation (TCM)[2,3], combines convolutional encoding with PSK or QAM signalling to provide spectrally efficient communication with forward error correction. Pragmatic TCM[4], uses the industry standard, 64-state, binary convolutional code. This paper presents a hardware implementation of a pragmatic TCM system for 8-PSK. This system associates each sector of a quantized phase receiver[7] with a pair of weights to be used as soft decision inputs of the Viterbi decoder. This system approaches 3dB of coding gain at bit error rates of 10-5 and less.