Data detector system
AssigneeUniversity of Limerick
InventorThomas J. Conway
Life of this patent
Estimating the term…
Abstract
A detector system detects values on a storage medium where there is ISI. The symbols are stored as pits in a close hexagonal lattice having u, v, and x dimensions at mutual 60° separations from an individual pit. The value for a particular symbol is determined by generating an estimate for the symbol in each of the u, v, and x dimensions. These estimates are used to generate a decision for the symbol as it is at the intersection of these dimensions. Thus a number of 1-dimensional detectors can be used although the platform is two-dimensional with ISI.
Claims15
A method carried out by at least one detector and a processor for processing stored data read from a storage medium in which the data is stored in a lattice arrangement of symbols, the method comprising the steps of:
- (a) generating an estimate for each symbol in a linear dimension in a first detector;
- (b) generating an estimate for each symbol in a different non-orthogonal linear dimension in a second detector;
- and
- (c) generating a decision for a symbol at the intersection of the dimensions using all estimates in the processor.
A system for processing stored data read from a storage medium in which the data is stored in a lattice arrangement of symbols, comprising:
- (a) a first detector for generating an estimate for each symbol in a linear dimension;
- (b) a second detector for generating an estimate for each symbol in a different non-orthogonal linear dimension;
- and
- (c) the processor for using all estimates to generate a decision for a symbol at the intersection of the dimensions;
- wherein the detector for a first dimension has more status than the second detector for a second dimension, and the second detector has more status than a third detector for a third dimension, said detectors being in series.
A system for processing stored data read from a storage medium in which the data is stored in a lattice arrangement of symbols, comprising:
- (a) a first detector for generating an estimate for each symbol in a linear dimension;
- (b) a second detector for generating an estimate for each symbol in a different non-orthogonal linear dimension;
- and
- (c) the processor for using all estimates to generate a decision for a symbol at the intersection of the dimensions;
- wherein the first dimension estimate detector implements a folded trellis with mapping to a reduced number of states.
Dependencies are inferred from the claim text.