Implementation of a digital read/write channel with EEPR4 detection

Welland, Dave; Phillip, S.; Tuttle, T.; Leung, Ka; Dupuie, S.; Holberg, D.; Jack, R.; Sooch, N.; Behrens, R.T.; Anderson, K.; Armstrong, A.J.; Bliss, W.G.; Dudley, T.; Foland, B.; Glover, N.; King, L.

doi:10.1109/20.364804

Cited by 12 publications

(1 citation statement)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Detectors for these channels, known as PRML detectors, employ PR equalization followed by maximum-likelihood (ML) sequence detection matched to the equalized channel. Most of the original generation of commercially available PRML detectors employed equalization to the PR4 channel and the Viterbi ML detection matched to this channel with additive white Gaussian noise [63], [56]. At higher linear densities, the channel transfer function changes and the PR4 equalization alters the spectral density of the noise by enhancing the high-frequency components.…”

Section: Introductionmentioning

confidence: 99%

Constrained coding for binary channels with high intersymbol interference

Karabed

Siegel

Soljanin

1999

IEEE Trans. Inform. Theory

View full text Add to dashboard Cite

Partial-response (PR) signaling is used to model communications channels with intersymbol interference (ISI) such as the magnetic-recording channel and the copper-wire channel for digital subscriber lines. Coding for improving noise immunity in higher order partial-response channels, such as the "extended" class-4 channels denoted EPR4, E 2 PR4, E 3 PR4, has become an important subject as the linear densities in magnetic recording approach those at which these partial-response channels are the best models of real channels. In this paper, we consider partialresponse channels for which ISI is so severe that the channels fail to achieve the matched-filter bound (MFB) for symbol error rate, assuming maximum-likelihood decoding. We show that their performance can be improved to the MFB by high-rate codes based on constrained systems, some of which may even simplify the Viterbi detectors relative to the uncoded channels. We present several examples of high-rate constrained codes for E 2 PR4 and E 3 PR4 channels and evaluate their performance by simulation.

show abstract

Section: Introductionmentioning

confidence: 99%