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IEEE International Conference on Information Theory and Information Security

Undetected error probability of hamming code for any number of symbols

Manish K. Gupta, Jaskaran Singh Bhullar, Bharat Naresh Bansal

Published Dec 1, 2010• 4 citations
Publisher

Abstract

In past papers, it has been shown that probability of undetected error Pu(ε) for binary (n = 2m- 1, k = n - m, 3) Hamming code (q = 2) used for error detection on binary symmetric channel satisfies the 2-pbound, where p is the parity check bits equal to n - k, hence binary Hamming codes are proper. In this correspondence this result is generalized and it has been shown that not only binary but Hamming Codes (for any value of q) satisfy this bound, so generalized Hamming codes are proper.

DOI
10.1109/icitis.2010.5689650

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In past papers, it has been shown that probability of undetected error Pu(ε) for binary (n = 2m- 1, k = n - m, 3) Hamming code (q = 2) used for error detection on binary symmetric channel satisfies the 2-pbound, where p is the parity check bits equal to n - k, hence binary Hamming codes are proper. In this correspondence this result is generalized and it has been shown that not only binary but Hamming Codes (for any value of q) satisfy this bound, so generalized Hamming codes are proper.
A recent paper [1] discussed the2^{-p}bound (wherep = n- k) for the probability of undetected errorP(\epsilon)for an(n,k)block code used for error detection on a binary symmetric channel. This investigation is continued and extended and dual codes are studied. The dual and extension of a perfect code obey the2^{-p}bound, but this is not necessarily true for arbitrary codes that obey the bound. Double-error-correcting BCH codes are shown to obey the bound. Finally the problem of constructing uniformly good codes is examined.
A q-ary (n, k) linear code is said to be proper if, as an error-detection code, the probability of undetectable error P/sub ud/ satisfies P/sub ud//spl les/q/sup -(n-k)/ for completely symmetric channels. We show that a proper code, as an error-correction code, satisfies the expurgated bound on the decoding error probability for a class of channels with the associated Bhattacharyya distance being completely symmetric. Known results on the undetectable error probability then immediately imply that the expurgated exponent is satisfied exactly by, for example, all the binary perfect codes, binary first-order Reed-Muller codes, binary (extended) Hamming code, binary 2-error correcting primitive BCH code, and all the maximum distance separable (MDS) codes, and asymptotically by some class of the binary t-error-correcting primitive BCH codes.>
The monotonic property of the probability of undetected error is considered when a shortened code of a linear code over GF(q) is used for error detection on a q-ary symmetric channel. Some conditions are presented under which the probability of undetected error is (or is not) monotonic with respect to the code length or the symbol error probability. It is shown that the probability of undetected error for a maximum distance separable code is monotonic with respect to the codelength. It is also shown that the probability of undetected error of a shortened code of any binary cyclic Hamming code generated by a trinomial is not monotonic with respect to the bit-error rate if the code length is short.>