Summary
The 2018 International Symposium on Information Theory and Its Applications (ISITA2018)
2018
Session Number:We-AM-1-1
Session:
Number:We-AM-1-1.4
Time-Varying Variable-Length Error-Correcting Codes
Victor Buttigieg, Johann A. Briffa,
pp.538-542
Publication Date:2018/10/18
Online ISSN:2188-5079
DOI:10.34385/proc.55.We-AM-1-1.4
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Summary:
Time-Varying Variable-Length Error-Correcting (TV-VLEC) codes for joint source-channel coding are introduced. These are codes that use different codebooks according to the symbol position. A sequence MAP decoder for TV-VLEC codes is also derived. It is shown that these codes can maintain a better symbol-level synchronization when compared to standard VLEC codes. A new symbol-constrained free distance measure is also introduced that enables the construction of TV-VLEC codes that outperform standard VLEC codes for the same average codeword length and decoder complexity. Using Monte Carlo simulation it is shown that for a simple 4-symbol code a coding gain of 2 dB can be achieved at a frame error rate of 10＾-3.