Method and apparatus of algorithm for coherent receivers with M-QAM modulation format
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United States of America Patent
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Jun 14, 2016
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Nov 7, 2013
app pub date -
Apr 26, 2013
filing date -
May 4, 2012
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Abstract
An improved Eighth-Order Statistics (EOS) blind phase recovery method is proposed for high-order coherent modulation formats. The method combining EOS blind phase estimate with maximum-likelihood (ML) carrier phase estimate uses multi-stage feed-forward carrier phase recovery algorithm. Experimental results show that the proposed new algorithm can reduce the required computational effort by more than a factor of 3 for 16-QAM system.
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