1 February 2014 Blind SNR estimation for QAM constellations based on the signal magnitude statistics
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We present a novel non-data-aided algorithm that uses only the magnitude of the received signal for accurate estimation of the signal-to-noise ratio (SNR) in M-QAM optical coherent digital receivers. The Koay inversion method that only works with constant-modulus signals, is extended through analytically exact expressions so as to allow application to any multi-level, complex modulation scheme. Performance is evaluated via simulation for formats up to 64-QAM and is shown to be superior than the decision-directed error vector magnitude (EVM) method at low SNR, while outperforming schemes based on the method of moments at high SNR.
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Stefanos Dris, Stefanos Dris, Christos Spatharakis, Christos Spatharakis, Paraskevas Bakopoulos, Paraskevas Bakopoulos, Ioannis Lazarou, Ioannis Lazarou, Hercules Avramopoulos, Hercules Avramopoulos, } "Blind SNR estimation for QAM constellations based on the signal magnitude statistics", Proc. SPIE 9009, Next-Generation Optical Communication: Components, Sub-Systems, and Systems III, 900905 (1 February 2014); doi: 10.1117/12.2034532; https://doi.org/10.1117/12.2034532

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