In coding theory, a coset leader is a of minimum weight in any particular – that is, a word with the lowest amount of non-zero entries. Sometimes there are several words of equal minimum weight in a coset, and in that case, any one of those words may be chosen to be the coset leader.
Coset leaders are used in the construction of a for a , which can then be used to decode received vectors. For a received vector y, the decoded message is y – e, where e is the coset leader of y. Coset leaders can also be used to construct a fast decoding strategy. For each coset leader u we calculate the syndrome uH′. When we receive v we evaluate vH′ and find the matching . The corresponding coset leader is the most likely error pattern and we assume that v+u was the codeword sent.