Locally coherent QPSK detection with differential decoding for a fading channel
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United States of America Patent
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Nov 4, 1997
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N/A
app pub date -
Oct 13, 1994
filing date -
Oct 13, 1994
priority date (Note) -
Expired
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Abstract
A locally coherent Quadrature Phase Shift Keying (QPSK) detector that uses a normalized fourth power weighting technique to generate an ambiguous local phase reference of a current symbol. A phase adjusted previous symbol reference is used to resolve the ambiguity using differentially coded data and yield current soft symbol information.
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