Patent Document ID: 8077812
Application ID: 12508697

Base Claim:
1. An apparatus for detecting a data pattern from a plurality of received signals, the apparatus comprising: a mapper providing a sequence of scan values derived from a sequence of count values, each scan value selecting one of a set of candidates in a varying pattern, wherein the mapper generates the sequence of scan values so as to select each of the set of candidates in a waveform-shaped periodic scan pattern; a difference term generator providing, for each of the sequence of count values, a difference term between a current metric value and a previous metric value based on a set of coefficients for a received symbol; an accumulator combining, for each of a sequence of count values, the difference term with one or more previous difference terms to provide one of a set of metric values; and a comparator generating, based on the set of metric values corresponding to the sequence of scan values, soft-output values corresponding to the data pattern.

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Claim 5:
5. The apparatus as recited in claim 1 , wherein the metric value for the received symbol is based on an error between the received symbol and one of the set of candidates.