TY - JOUR
T1 - Joint Iterative Carrier Synchronization and Signal Detection Employing Expectation Maximization
AU - Zibar, Darko
AU - de Carvalho, Luis Henrique Hecker
AU - Estaran Tolosa, Jose Manuel
AU - Silva, Edson
AU - Franciscangelis, Carolina
AU - Ribeiro, Vitor
AU - Borkowski, Robert
AU - Winther, Ole
AU - Schmidt, Mikkel Nørgaard
AU - Oliveira, Julio
AU - Tafur Monroy, Idelfonso
PY - 2014
Y1 - 2014
N2 - 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.
AB - 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.
KW - Advanced modulation formats
KW - Coherent detection
KW - Digital signal processing (DSP)
KW - Expectation maximization (EM)
KW - Maximum likelihood
U2 - 10.1109/JLT.2014.2308636
DO - 10.1109/JLT.2014.2308636
M3 - Journal article
SN - 0733-8724
VL - 32
SP - 1608
EP - 1615
JO - Journal of Lightwave Technology
JF - Journal of Lightwave Technology
IS - 8
ER -