Title :
Dual-Stage Cascaded Frequency Offset Estimation for Digital Coherent Receivers
Author :
Zhang, S. ; Xu, L. ; Yu, J. ; Huang, M.-F. ; Kam, P.Y. ; Yu, C. ; Wang, T.
Author_Institution :
Dept. of Electr. & Comput. Eng., Nat. Univ. of Singapore, Singapore, Singapore
fDate :
3/15/2010 12:00:00 AM
Abstract :
Frequency offset estimation is a key function in carrier phase recovery to enable digital coherent reception. We propose a novel, feed-forward, dual-stage frequency offset estimator, and demonstrate its performance through both simulation and experiment. Our simulation results show that the estimation range can be as large as ?? 9 GHz for a 10.7-GBaud polarization-multiplexed (PolMux) quadrature phase-shift keying (QPSK) system. In addition, the widest range of ??0.5 times the system symbol rate is achieved for the first time in an experimental 42.8-Gb/s coherent PolMux QPSK receiver.
Keywords :
quadrature phase shift keying; radio receivers; QPSK; bit rate 42.8 Gbit/s; carrier phase recovery; digital coherent receivers; digital coherent reception; dual-stage cascaded frequency offset estimation; dual-stage frequency offset estimator; feed-forward; frequency 9 GHz; polarization-multiplexed quadrature phase-shift keying system; Coherent optical communication; frequency offset; timing recovery;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2010.2040171
