Title :
Soft-decoding of convolutional block codes for an interactive television return channel
Author :
Carlach, J.C. ; Castelain, D. ; Combelles, P.
Author_Institution :
France Telecom, CNET, Cesson-Sevigne, France
Abstract :
The paper presents and compares some codes with simple soft-decoding algorithms in order to implement a low cost and reliable terrestrial return channel for an interactive television system. It paper presents bit error rate (BER) simulation results of Viterbi (1967) soft-decoding of zero-tail (ZT) and tail-biting (TB) trellis codes. We named these codes “convolutional block (CB)” codes because these block codes are built with convolutional codes. We compare the performance and soft-decoding complexity of the ZT and TB variants of the same CB code for code lengths n⩽380, and for code rates r=1/2, 2/3, 3/4. We also compare TB-CB codes of rate r=1/2 for lengths n⩽380 against the Golay (24, 12) code in order to study the evolution of the performance complexity trade-off when we increase the length n of the CB codes. Finally, we compare these CB codes against punctured product codes based on the extended Hamming (32, 26) soft-decoded code with an iterative/turbo algorithm
Keywords :
Hamming codes; Viterbi decoding; block codes; coding errors; computational complexity; convolutional codes; error statistics; interactive television; telecommunication channels; trellis codes; BER simulation results; Viterbi soft-decoding; bit error rate; code lengths; code rates; convolutional block codes; extended Hamming soft-decoded code; interactive television return channel; interactive television system; iterative/turbo algorithm; low cost return channel; performance; performance complexity trade-off; punctured product codes; reliable terrestrial return channel; soft-decoding algorithms; soft-decoding complexity; tail-biting trellis codes; zero-tail trellis codes; Bit error rate; Block codes; Convolutional codes; Costs; Error correction codes; Frequency synchronization; Iterative decoding; Signal to noise ratio; TV; Viterbi algorithm;
Conference_Titel :
Universal Personal Communications Record, 1997. Conference Record., 1997 IEEE 6th International Conference on
Conference_Location :
San Diego, CA
Print_ISBN :
0-7803-3777-8
DOI :
10.1109/ICUPC.1997.625559
