Systems and modules for use with trellis-based decoding
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United States of America Patent
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Nov 24, 2009
Grant Date -
Sep 16, 2004
app pub date -
Feb 28, 2003
filing date -
Feb 28, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Systems and modules for use in trellis-based decoding of convolutionally encoded sets of data bits. A first calculation module receives an encoded set of data bits and calculates a signal distance or a measure of the differences between the encoded set and each one of a group of predetermined states. The first calculation module consists of multiple parallel calculation submodules with each submodule being tasked to perform an XOR operation between the encoded set and one of the predetermined states. Multiple parallel second calculation modules each receiving the output of the first calculation module, calculate cumulative signal distances using the output of the first calculation module. Each second calculation module outputs its lowest valued cumulative signal distance and this may be used as input to a memory system for storing a database used in further decoding of the encoded data.
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