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AssigneeKoninklijke Philips Electronics N.V.
InventorsAndries Hekstra, Willem Coene, Albert Immink
Estimating the term…
When processing a two dimensional data area it is known to be advantageous to divide the two dimensional are into stripes and process each stripe using a stripe-wise detector. The stripe being processed shifts row per row downwards. Each stripe has as its output the bit-decisions of the top bit-row of the stripe which is the most reliable. That output bit-row is also used as side-information for the bit detection of the next stripe which is the stripe which is shifted one bit-row downwards. The bit-row just across the bottom of the stripe on the other hand still needs to be determined in the current iteration, so only the initialisation bit-values can be used in the first iteration of the stripe-wise bit-detector. In order to prevent the propagation of errors towards the top bit row of the stripe the relative weight for the bottom branch bit in the figure-of-merit is reduced from the full 100% to a lower fraction.
A stripe wise iterative symbol detection method for detecting symbol values of a data block recorded along an N-dimensional channel tube, N being at least 2, on a record carrier of a set of symbol rows, one dimensionally evolving along a first direction and being aligned with each other along at least a second of N-1 other directions, said first direction together with said N-1 other direction constituting an N-dimensional lattice of symbol positions, wherein a stripe is a subset of a row and at least one neighboring row, the iteration of said stripe wise iterative symbol detection comprises:
A stripe wise iterative symbol detection method as claimed in claim 11, characterized in that the symbol detection with the highest reliability is a symbol detection from a previous iteration.
A symbol detector comprising a first detector comprising estimation means for estimating symbol values in a first stripe, receiving means for receiving side information derived from at least one row adjacent to the first stripe, coupled to the estimation means for providing said side information to the estimation means for use in the estimation of said symbol values and output means for providing further side information, and a second detector comprising further estimation means for estimating symbol values in a second stripe, further receiving means for receiving side information derived from the output of the first detector coupled to the further estimation means for providing said side information to the further estimation means for use in the estimation of said symbol values from the second stripe.
Dependencies are inferred from the claim text.