Chinese Optics Letters, 2010, 8 (9): 888, Published Online: Oct. 18, 2010
Blind frequency offset estimation based on cyclic prefix and virtual subcarriers in CO-OFDM system 
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盲估计 频偏 循环前缀 虚载波 060.0060 Fiber optics and optical communications 060.1660 Coherent communications 060.2330 Fiber optics communications 060.5060 Phase modulation
Abstract
A new blind frequency offset estimation method based on cyclic prefix and virtual subcarriers in coherent optical orthogonal frequency division multiplexing (CO-OFDM) system is presented. It is able to estimate the fractional part and integral part of frequency offset at the same time. Its estimation range is about [?3.5 GHz, 3.5 GHz]. The influence of the integral frequency offset is comprehensively analyzed in COOFDM system. Its performances in the additive white Gaussian noise (AWGN) channel and the dispersive channel are investigated, respectively. Simulation results indicate that even in the dispersive channel, when the optical signal-to-noise ratio (OSNR) is low, it can still work very well.
Yaojun Qiao, Zhansheng Wang, Yuefeng Ji. Blind frequency offset estimation based on cyclic prefix and virtual subcarriers in CO-OFDM system[J]. Chinese Optics Letters, 2010, 8(9): 888.
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