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سند علمی

A convolutional single-parity-check concatenated coding scheme for high-data-rate applications

Robert Schweikert, A. J. Han Vinck

چکیده

Absfmcf-The paper describes the possible implementation of concatenated coding scheme suitable particularly for high date rate applications. The proposed coding scheme uses a set of n convolutional codes multiplexed into an inner code and a (n, n 1) single-parity-check code serving as the outer code. Each of the inner convolutional codes is decoded independently with maximum-likelihood decoding being achieved via n parallel implementations of the Viterbi algorithm. The Viterbi decoding is followed by additional outer soft-decision single-parity-check decoding. Considering n = 12 and the set of short constraint length K = 3, rate 1/2 convolutional codes, it is shown, that the performance of the concatenated scheme is comparable to the performance of the constraint length K = 7, rate 1/2 convolutional code with standard soft-decision Viterbi decoding. Simulation results are presented for the K = 3, rate 1/2 as well as for the punctured K = 3, rate 2/3 and rate 3/4 inner convolutional codes. Moreover, the performance of the proposed concatenated scheme using a set of K = 7, rate 1/2 inner convolutional codes is given. CONV. CODER m I I

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