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Proceedings Paper

Blind SNR estimation for QAM constellations based on the signal magnitude statistics
Author(s): Stefanos Dris; Christos Spatharakis; Paraskevas Bakopoulos; Ioannis Lazarou; Hercules Avramopoulos
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Paper Abstract

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.

Paper Details

Date Published: 1 February 2014
PDF: 9 pages
Proc. SPIE 9009, Next-Generation Optical Communication: Components, Sub-Systems, and Systems III, 900905 (1 February 2014); doi: 10.1117/12.2034532
Show Author Affiliations
Stefanos Dris, National Technical Univ. of Athens (Greece)
Christos Spatharakis, National Technical Univ. of Athens (Greece)
Paraskevas Bakopoulos, National Technical Univ. of Athens (Greece)
Ioannis Lazarou, National Technical Univ. of Athens (Greece)
Hercules Avramopoulos, National Technical Univ. of Athens (Greece)


Published in SPIE Proceedings Vol. 9009:
Next-Generation Optical Communication: Components, Sub-Systems, and Systems III
Guifang Li, Editor(s)

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