In  a syndrome counting based upper bound on the minimum distance of regular binary LDPC codes is given. In this paper we extend the bound to the case of irregular and generalized LDPC codes over GF(q). A comparison with the lower bound for LDPC codes over GF(q), upper bound for the codes over GF(q), and the shortening upper bound for LDPC codes is made. The new bound is shown to lie under the Gilbert–Varshamov bound at high rates.
Problems of Information Transmission – Springer Journals
Published: May 8, 2016
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