Abstract
In this paper, joint estimation of carrier frequency, phase, signal means and noise variance, in a
maximum likelihood sense, is performed iteratively by employing expectation maximization. The parameter estimation is
soft decision driven and allows joint carrier synchronization and data detection. The algorithm is tested in a mixed
line rate optical transmission scenario employing dual polarization 448 Gb/s 16-QAM signal surrounded by eight on-off
keying channels in a 50 GHz grid. It is shown that joint carrier synchronization and data detection are more
robust towards optical transmitter impairments and nonlinear phase noise, compared to digital phase-locked loop (PLL)
followed by hard decisions. Additionally, soft decision driven joint carrier synchronization and detection offers an
improvement of 0.5 dB in terms of input power compared to hard decision digital PLL based carrier synchronization
and demodulation.
© 2014 IEEE
PDF Article
More Like This
Nonlinear impairment compensation using expectation maximization for dispersion managed and unmanaged PDM 16-QAM transmission
Darko Zibar, Ole Winther, Niccolo Franceschi, Robert Borkowski, Antonio Caballero, Valeria Arlunno, Mikkel N. Schmidt, Neil Guerrero Gonzales, Bangning Mao, Yabin Ye, Knud J. Larsen, and Idelfonso Tafur Monroy
Opt. Express 20(26) B181-B196 (2012)
Cited By
You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Login to access Optica Member Subscription