Maximum-likelihood symbol detection for RLL-coded data

Details Maximum-likelihood symbol detection for RLL-coded data Maximum-likelihood symbol detection for RLL-coded data

1995-06-13

1997-06-10

Williams, Howard L.

Coded data generation or conversion

Digital code to digital code converters

To or from run length limited codes

375343, 371 43, H03M 700

Patent

active

056380658

ABSTRACT:
Parallel ML processing of an analog signal in a RLL-coded channel in which (1) vectors for a current state of the channel and the next state of the channel are computed using Walsh transform vector coefficients of the analog signal; (2) current state vectors and next state vectors and values of vectors precomputed in analog matched filters are used to generate vector scalar products which are compared against preselected threshold values for generating binary decision outputs that are used in digital sequential finite state machines to generate ML symbol decisions; and (3) ML symbol decisions are fed back and used to subtract the intersymbol interference value of the current state vector from the vector of the next state to transform the next state vector into an updated current state vector.

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Alan H. Morton et al., "PRML Technology Delivers More Bytes for the Buck", Data Storage, May/Jun. 1995, pp. 45-48.
J. L. Walsh, "A Closed Set of Normal Orthogonal Functions", American Journal of Mathematics, vol. 45, 1923, pp. 5-24.

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