Joint timing/frequency offset estimation and correction based on FrFT encoded training symbols for PDM CO-OFDM systems

被引：15
|
作者：
Zhou, Huibin [1 ,2 ]
Li, Xiang [3 ]
Tang, Ming [1 ,2 ]
Wu, Qiong [1 ,2 ]
Chen, Xi [1 ,2 ]
Luo, Ming [3 ]
Fu, Songnian [1 ,2 ]
Liu, Deming [1 ,2 ]
机构：
[1] Huazhong Univ Sci & Technol, WNLO, Sch Opt & Elect Informat, Wuhan 430074, Peoples R China
[2] Huazhong Univ Sci & Technol, Natl Engn Lab Next Generat Internet Access Syst, Sch Opt & Elect Informat, Wuhan 430074, Peoples R China
[3] Wuhan Res Inst Post & Telecommun, State Key Lab Opt Commun Technol & Networks, Wuhan 430074, Hubei, Peoples R China
来源：
OPTICS EXPRESS | 2016年 / 24卷 / 25期
基金：
中国国家自然科学基金;
关键词：
TIME-FREQUENCY-DISTRIBUTIONS; TIMING SYNCHRONIZATION; FOURIER-TRANSFORM; COHERENT; SCHEME;
D O I：
10.1364/OE.24.028256
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
A joint timing offset (TO) and frequency offset (FO) estimation algorithm is proposed for polarization division multiplexing (PDM) coherent optical orthogonal frequency-division multiplexing (CO-OFDM) systems. It is realized by taking the advantage of the time-frequency property of the fractional Fourier transformation (FrFT) encoded training symbols. Compared with the classical Schmidl & Cox method, the proposed algorithm exhibits robust estimation result of timing offset with poor optical signal-to-noise ratio (OSNR) and nonlinear interference. For the frequency offset estimation, a quite large FO estimation ranges of [-5GHz + 5GHz] can be achieved. The mean normalized estimation error can be kept under 0.002 and the max normalized estimation error is no more than 0.008. The feasibility and effectiveness of the proposed joint estimation algorithm has been verified by experiments. The transmission performances with [-5GHz + 5GHz] FO are compared under the OSNR range from 14 to 27dB in a 106.8Gbit/s 16-ary quadrature amplitude modulation (16-QAM) PDM CO-OFDM transmission system. The proposed TO/FO estimation algorithm performs robustly and accurately without any induced BER degradations. (C) 2016 Optical Society of America
引用
收藏
页码：28256 / 28269
页数：14
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