1988-06-17
1990-04-10
Atkinson, Charles E.
Excavating
G06F 1110
Patent
active
049167022
ABSTRACT:
In an error trapping decoder in which a received codeword is shifted through a re-encoder shift register to produce a set of r syndrome characters and in which the encoder shift register is then isolated and its contents shifted until a number of consecutive zero virtual check characters is produced therein, the capacity to trap long error bursts is enhanced by increasing the size of the code and by demanding that the minimum number of consecutive zero virtual check characters be only sufficient to ensure an acceptably low probability that one or more of the zero-value virtual check characters is a false indication. Such a decoder may be used to determine the location of an error burst in a received block of interleaved codewords as long as at least one of the codewords in the block produces the minimum number of consecutive zero-value virtual check characters after a requisite number of shifts of the encoder. Upon this occurrence, the codeword locations of the non-zero-value virtual check characters are designated as erasure locations for the rest of the codewords in the block, thus enabling all of them to be decoded.
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Atkinson Charles E.
Cyclotomics, Inc.
Wallace Robert M.
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