Apparatus and method for trellis-based detection in a communication system
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United States of America Patent
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Oct 15, 2013
Grant Date -
Apr 19, 2012
app pub date -
Oct 14, 2010
filing date -
Oct 14, 2010
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Abstract
An apparatus for trellis-based detection in a communication system including a processor and memory having computer program code configured to construct a trellis representing a transmitted signal formed from a plurality of symbols, each having a constellation size, transmitted by a number of transmit antennas, and form a log likelihood ratio at nodes of the trellis as a log-sum of a number of exponential terms corresponding to a hypothesized transmitted bit value of the plurality of symbols. The number of exponential terms is limited by a number of most likely paths of the trellis extending from each node of the trellis and the constellation size. The processor and memory including computer program code are further configured to form a list at each node of the trellis of a size limited to the number of the most likely paths of the trellis extending from each node of the trellis.
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