Title :
Error performance analysis of a concatenated coding scheme with 64/256-QAM trellis coded modulation for the north American cable modem standard
Author :
Rhee, DoJun ; Zaragoza, Robert H Morelos
Author_Institution :
LSI Logic Corp., Milpitas, CA, USA
Abstract :
Concatenated coding schemes with Reed-Solomon (RS) coding in the outer stage and trellis coded modulation (TCM) in the inner stage are analyzed. The TCM decoder incorporates a Viterbi decoder compliant with ITU-T Recommendation J.83, Annex B (north American digital video transmission specifications for multimedia cable network system (MCNS)). The module is suitable as the inner stage for a concatenated decoding scheme. A triple-error-correcting extended RS (128,122,7) code is used in the outer stage. Union bounds on the bit error performance of concatenated coding schemes, over 64- and 256-QAM signal constellations over AWGN channels are derived and verified by computer simulations. The effects of quantization of input symbols and of trace-back depth in the Viterbi decoder are simulated as well
Keywords :
AWGN channels; Reed-Solomon codes; Viterbi decoding; concatenated codes; error statistics; modems; quadrature amplitude modulation; quantisation (signal); telecommunication standards; trellis coded modulation; 256-QAM; 64-QAM; AWGN channels; ITU-T Recommendation; Reed-Solomon coding; TCM decoder; Viterbi decoder; bit error performance; computer simulations; concatenated coding; concatenated decoding; digital video transmission specifications; error performance analysis; extended RS code; inner stage; input symbols; multimedia cable network system; north American cable modem standard; outer stage; quantization; signal constellations; trace-back depth; trellis coded modulation; triple-error-correcting code; union bounds; AWGN channels; Computer errors; Concatenated codes; Constellation diagram; Decoding; Modulation coding; Multimedia systems; Performance analysis; Reed-Solomon codes; Viterbi algorithm;
Conference_Titel :
Information Theory, 1998. Proceedings. 1998 IEEE International Symposium on
Conference_Location :
Cambridge, MA
Print_ISBN :
0-7803-5000-6
DOI :
10.1109/ISIT.1998.708642
