Rate 8/9 sliding block distance-enhancing code with stationary detector

A new distance-enhancing code for partial-response magnetic recording channels eliminates most frequent errors, while keeping the two-step code trellis time invariant. Recently, published trellis codes either have lower code rates or result in time-varying trellises with a period of nine, thus requi...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2001-05, Vol.37 (3), p.1168-1174
Main Authors: Nikolic, B., Ming-Tak Leung, M., Ki-Chun Fu, L.
Format: Article
Language:English
Subjects:
Applied sciences
Channels
Coding
Convolutional codes
Detectors
Electronics
Exact sciences and technology
Gain
Gaussian
Ground penetrating radar
Instruments
Intersymbol interference
Invariants
Magnetic devices
Magnetic properties
Magnetic recording
Magnetism
Maximum likelihood detection
Other magnetic recording and storage devices (including tapes, disks, and drums)
Partial response channels
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Trellis codes
Viterbi algorithm
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Summary:A new distance-enhancing code for partial-response magnetic recording channels eliminates most frequent errors, while keeping the two-step code trellis time invariant. Recently, published trellis codes either have lower code rates or result in time-varying trellises with a period of nine, thus requiring a higher complexity of detectors and code synchronization. The new code introduces dependency between code words in order to achieve the same coding constraints as the 8/9 time-varying maximum transition runlength (TMTR) code, with the same code rate, but resulting in a trellis that has a period of 2. This code has been applied to the E/sup 2/PR4 and a 32-state generalized partial response (GPR) ISI target. The resulting two-step trellises have 14 and 28 states, respectively. Coding gain is demonstrated for both targets in additive white Gaussian noise.
ISSN:0018-9464
1941-0069
DOI:10.1109/20.920493