Method for Estimating the Phase and the Gain of Observation Data Transmitted Over a Qam-Modulated Transmission Channel
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United States of America Patent
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Issued Date -
Mar 13, 2008
app pub date -
Sep 16, 2005
filing date -
Sep 20, 2004
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Abandoned
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Abstract
The invention concerns a method for estimating the gain and/or the phase of observation data (y.sub.k) transmitted in QAM modulation. The method includes (A) iteratively estimating the phase and/or gain parameters based on a specific phase and/or gain law and (B) executing an adaptive procedure for estimating the phase and/or gain parameters, the adaptive procedure including at least one function for estimating the parameters based on the value of likelihood probability, expressed in terms of log-likelihood, of each observation data (y.sub.k) with respect to the set of bits constituting the symbols of the QAM modulation. The invention is applicable to single-carrier or multicarrier digital transmissions.
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