Turbo decoding for partial response channels with media noise

Souvignier, T.; Caroselli, J.; Dati, A.; Wolf, J.K.

doi:10.1109/glocom.1999.830162

Cited by 3 publications

(2 citation statements)

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“…When a transition is written, an instantaneous magnetization reversal is thought to occur on each microtrack with its position being independent from microtrack to microtrack. For the th microtrack, the displacement of this position around the ideal center of the transition is characterized by the probability density function (9) where is the hyperbolic secant function. The parameter specifies the width of the transition and will be a determinant of the amount of transition noise.…”

Section: Microtrack Channel Modelmentioning

confidence: 99%

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Turbo decoding for partial response channels

Souvignier

Oberg

Siegel

et al. 2000

IEEE Trans. Commun.

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The partial response channel can be viewed as a rate-1 encoder in which the output alphabet differs from the input alphabet. In serially concatenated coding schemes, the partial response channel can serve as the inner encoder. Recent work on the application of turbo decoding techniques to partial response channels has focused on using a parallel concatenation of convolutional encoders as the outer code and the partial response channel as the inner code. This system requires three a posteriori probability (APP) detectors-one matched to the channel and two matched to the constituent encoders. A simplified system will be presented that uses as its outer code a single convolutional code and as its inner code the partial response channel. The simplified system requires only two APP detectors, offering significant savings in complexity and computation time. This single convolutional code system will be shown to perform as well as the more complicated system, offering substantial gains over uncoded systems. Simulation results for three magnetic recording channel models will be presented: a partial response channel with additive white Gaussian noise, an equalized Lorentzian channel model, and a media noise model called the microtrack model. Since the use of an outer Reed-Solomon code is anticipated in an actual system, the burst-error statistics are investigated. System performance with various interleaver designs and precoders is also investigated. Index Terms-Concatenated coding, iterative methods, partial response signaling, turbo codes. I. INTRODUCTION T URBO codes were introduced by Berrou et al. [1] in 1993 as two or more parallel concatenated convolutional codes (PCCC's) connected with an interleaver and decoded using an iterative technique. These codes are capable of operating near Shannon capacity on an additive white Gaussian noise (AWGN) channel. The term "turbo decoding" has subsequently come to refer to this iterative decoding process. Therefore, in this paper, Paper approved by S. S. Pietrobon, the Editor for Coding Theory and Techniques of the IEEE Communications Society.

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Section: Microtrack Channel Modelmentioning

confidence: 99%

“…Considerable work has been done recently by Heegard [2], McPheters et al [3], Reed and Schlegel [4], Ryan [5], Ryan et al [6], Souvignier et al [7]- [9], and others investigating the application of turbo decoding to partial response channels. Related work includes [10]- [14].…”

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confidence: 99%