Coding Techniques for Digital Recorders
Coding Techniques for Digital Recorders
A practical method for approaching the channel capacity of constrained channels
IEEE Transactions on Information Theory
A modified concatenated coding scheme, with applications to magnetic data storage
IEEE Transactions on Information Theory
IEEE Transactions on Information Theory
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A useful tool in the design of reliable digital communication systems is channel coding. Turbo codes have been shown to yield an outstanding coding gain close to theoretical limits in the Additive White Gaussian Noise (AWGN) channel. In this paper, a novel DC-free turbo coding scheme using Maximum A Posteriori algorithm (MAP)/ Soft Output Viterbi Algorithm (SOVA) for the turbo decoder is presented. The proposed scheme achieves the DC-free coding and error-correcting capability simultaneously. The scheme has a simple cascaded structure of the running digital sum (RDS) control encoder and the turbo encoder. A given sequence becomes DC-free if and only if the absolute RDS value of the sequence is bounded by a constant for any time instant. The RDS control encoder generates a sequence which gives the turbo coded sequence with a bounded RDS value. The structure allows us to exploit efficient soft-decision decoding which attains additional coding gains compared with hard-decision decoding over an additive white Gaussian noise (AWGN) channel.