Open AccessEstimating OSNR of equalised QPSK signals
Author(s) -
D. J. G. Ives,
Benn C. Thomsen,
Robert Maher,
Seb J. Savory
Publication year - 2011
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.19.00b661
Subject(s) - phase shift keying , optics , signal (programming language) , signal to noise ratio (imaging) , signal processing , calibration , computer science , physics , bit error rate , telecommunications , mathematics , statistics , channel (broadcasting) , radar , programming language
We propose and demonstrate a technique to estimate the OSNR of an equalised QPSK signal based on the radial moments of the complex signal constellation. The technique is compared through simulation with maximum likelihood estimation and the effect of the block size used in the estimation is also assessed. The technique is verified experimentally and when combined with a single point calibration the OSNR of the input signal was estimated to within 0.5 dB.