Vector fixed-lag algorithm for decoding input symbols
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United States of America Patent
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Mar 16, 2004
Issued Date -
N/A
app pub date -
Apr 30, 2001
filing date -
Oct 30, 1998
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Expired
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Abstract
The present invention discloses an apparatus and method of decoding information received over a noisy communications channel to determine the intended transmitted information. The present invention uses a vector fixed-lag algorithm to determine the probabilities of the intended transmitted information. The algorithm is implemented by multiplying an initial state vector with a matrix containing information about the communications channel. The product is then recursively multiplied by the matrix .tau. times, using the new product with each recursive multiplication and the forward information is stored for a fixed period of time, .tau.. The final product is multiplied with a unity column vector yielding a probability of a possible input. The estimated input is the input having the largest probability.
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