High Quality Content by WIKIPEDIA articles! In coding theory, concatenated codes form a class of error-correcting codes that are derived by combining an inner code and an outer code. They were conceived in 1966 by Dave Forney as a solution for the problem of finding a code that has both exponentially decreasing error probability with increasing block length and polynomial-time decoding complexity.Let C be a code with length N and rate R over an alphabet A with K=N*R symbols. Let I be another code with length n and rate r over an alphabet B with k=n*r symbols.

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