CONSTELLATION DETECTION IN A MULTI-MODE QAM COMMUNICATIONS SYSTEM
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United States of America Patent
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Issued Date -
May 2, 2013
app pub date -
Dec 10, 2012
filing date -
Jun 17, 2009
priority date (Note) -
Abandoned
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Abstract
Systems and methods for determining an unknown QPSK or QAM constellation from a set of possible received constellations are described. One method utilizes a histogram of the power of the signal after inter-symbol-interference has been minimized with a modified constant modulus algorithm equalizer. The constellation may be determined before carrier frequency and phase has been fully recovered. An unknown QPSK or QAM constellation may be identified before or after equalization using disclosed methods for analyzing an output power histogram.
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