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On Minimum-WER Performance of a Class of LDPC Codes for the BSC/E Under Extended Bounded-Distance Decoding

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2 Author(s)
Amitkumar Mahadevan ; Dept. of Comput. Sci. & Electr. Eng., Univ. of Maryland Baltimore County, Catonsville, MD ; Joel M. Morris

We study the word-error-rate (WER) performance and the WER-minimizing decision thresholds plusmnt* for the class of row-column-diagonal (RCD) array codes and their generalizations on the binary symmetric channel with erasures (BSC/E) where decoding is via an extended bounded-distance decoder (e-BDD). This model applies to very-high-data-rate systems where soft-decision iterative decoding is impractical. We demonstrate that substantial WER performance gain can be obtained, especially at higher channel signal-to-noise ratio (CSNR) (CSNR =Delta 10 log10 (1/2sigma2)) values, by employing two optimal thresholds ( plusmnt*) chosen to minimize WER. We study the WER improvement and signal-to-noise ratio (SNR) performance gain as a function of code length (n) for fixed minimum distance (dmin), and as a function of (dmin) for fixed (n). A distinct difference in the behavior of WER versus the threshold t, and the optimal threshold t* versus SNR, is observed between codes with odd and even dmin, with the even dmin. codes exhibiting larger performance improvements when employing a BSC/E instead of a BSC

Published in:

IEEE Transactions on Communications  (Volume:55 ,  Issue: 2 )