&lt;title&gt;Coding for higher-order partial-response channels&lt;/title&gt;

Karabed, R.; Siegel, Paul H.

doi:10.1117/12.228239

Cited by 55 publications

(40 citation statements)

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“…At higher user densities, channel BER can be improved by employing a 32-state Viterbi detector that corresponds to targets that better match the channel response. The PR of type (8) matches the Lorentzian channel at a user density of 3.0. The resulting target has 11 discrete signal levels [ ] with squared distance of 20, and a single bit error event with a squared distance of 22.…”

Section: Application Of the Methods To Other Partial Response Chanmentioning

confidence: 76%

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Reduced complexity sequence detection for high-order partial response channels

Leung

Nikolić²,

Fu³

et al. 2001

IEEE J. Select. Areas Commun.

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Abstract-Detector hardware complexity of high-order partial response magnetic read channels is a major obstacle to high data rate operation and reduced area and power consumption. The method presented here reduces the complexity of single-step and two-step implementations of the Viterbi detector by applying a distance-enhancing code that eliminates some states from the code trellis. The complexity of the detector is further reduced by eliminating less-probable branches from the trellis. This is accomplished by a simple control mechanism that uses the signs of the consecutive input samples. The reduced set of add-compare-select (ACS) units is dynamically assigned to the detector states, decreasing the complexity of the Viterbi detector by roughly 50%. This method is demonstrated on high-order partial response systems with the E 2 PR4 target and an 11-level/32-state target. The simulation results show negligible bit error rate (BER) degradation for signal-to-noise ratios in the range of operation of contemporary disk drive read channels.

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Section: Application Of the Methods To Other Partial Response Chanmentioning

confidence: 76%

“…Recently, several trellis codes that eliminate the most common error events by using coding constraints have been proposed for PR signaling [8]- [18]. Most common errors in higher order PR channels are caused by sequences of three or more consecutive recorded transitions.…”

Section: B Time-varying Maximum Transition Runlength (Tmtr) Codes Anmentioning

confidence: 99%

Reduced complexity sequence detection for high-order partial response channels

Leung

Nikolić²,

Fu³

et al. 2001

IEEE J. Select. Areas Commun.

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“…Therefore, by the above procedure of defining the list of forbidden code strings, we obtain the NRZ constraint. Its capacity is about 0.81, and a rate 4/5 code into the constraint was first given in [7].…”

Section: B Definitionsmentioning

confidence: 99%

“…In the ideal case (1), the probability of detecting given that was recorded is equal to , where is the distance between and given by (7) Therefore, a lower bound, and a close approximation for small , to the minimum probability of an error-event in the system is given by , where is the channel minimum distance of code . We refer to (8) as the minimum distance of the uncoded channel, and to the ratio as the gain in distance of code over the uncoded channel.…”

Section: Channels With Colored Noise and Intertrack Interferencementioning

confidence: 99%

Application of distance enhancing codes

Soljanin¹,

Wijngaarden

2001

IEEE Trans. Magn.

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Abstract-During the past few years, significant progress has been made in defining high capacity constraints which prohibit specified differences between constrained sequences, thus ensuring that the minimum distance between them is larger than for the uncoded system. However, different constraints which avoid the same prescribed set of differences may have different capacities, and codes into such constraints may have different complexity of encoder/decoder architecture and different performance on more realistic channel models. These issues, which have to be considered in application of distance enhancing codes, are discussed here. We define several distance enhancing constraints which support design of high rate codes. We also define weak constraints for which the minimum distance between sequences may be the same as for the uncoded system but the number of pairs of sequences at the minimum distance is smaller. These constraints support design of even higher rate codes. We discuss the implementation issues of both types of constraints as well as their performance on the ideal channel and channels with colored noise and intertrack interference.

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“…Even higher rate codes to achieve the same increase in minimum distance have also been proposed. These include a family of codes in [5] and the rate 8/9 code based on a time varying MTR (TMTR) constraint proposed in [6].…”

Section: Introductionmentioning

confidence: 99%

A new target response with parity coding for high density magnetic recording channels

Conway

1998

IEEE Trans. Magn.

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In this paper, a modified equalization target is proposed for the high density magnetic recording channel. This target is a closer match to the channel than the EEPR4 response and hence has better detection performance. Based on the dominant error events for this target, a parity-based coding scheme is also proposed to achieve a coding gain with the modified target. The use of the parity code detects the occurrence of the dominant error events while achieving a high code rate. The detection system consists of a Viterbi detector matched to the channel response and a post processor to handle the code constraints. This system is shown to perform well compared to other proposed detection systems through analysis and simulation on a Lorentzian based channel model.

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<title>Coding for higher-order partial-response channels</title>

Cited by 55 publications

References 0 publications

Reduced complexity sequence detection for high-order partial response channels

Reduced complexity sequence detection for high-order partial response channels

Application of distance enhancing codes

A new target response with parity coding for high density magnetic recording channels

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