DCm codes for constructing t-EC/AUED codes

A common method for constructing t-error correcting/all unidirectional error detecting (t-EC/AUED) codes is to append a tail to t-EC code, where the tail is a function of the weight of the codeword. Here. we present a method to reduce the weight distribution of t-EC codes by using a DCm(k + d, k) code as the input of t-EC code where a DCm(k + d, k) code is of length k + d and 2(k) codewords with the weight distribution between inverted right perpendicular (k + d - m)/2 inverted left perpendicular and inverted right perpendicular (k + d + m)/2 inverted left perpendicular. It is shown that our t-EC/AUED codes have the better information rates than the previously developed codes due to the smaller tails.