Abstract
A novel symbol timing synchronization algorithm based on constant amplitude zero auto correlation (CAZAC) sequences is proposed for coherent optical orthogonal frequency division multiplexing (CO-OFDM) systems. The training symbol of the proposed algorithm is comprised of four different parts, utilizing even symmetry property of each part to accomplish timing synchronization. The performance of the proposed algorithm is demonstrated by means of simulations in OFDM and CO-OFDM systems. The proposed algorithm is shown to eliminate the timing sidelobes of Park’s algorithm and has a more accurate timing estimation. In the condition of chromatic dispersion (CD), the timing metric of the proposed method still maintains its peak value at the correct timing point, while the values are almost 0 at all the other positions. Meanwhile, the timing mean square error (MSE) of the proposed algorithm remains around 10-6.
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References
CHENG Zhi-Hui, BAI Cheng-lin, LUO Qing-Long and SUN Wen-Tao, Journal of Optoelectronics·Laser 26, 1097 (2015). (in Chinese)
Shuai Zhang, Shun-chang Bai, Cheng-lin Bai and Qing-long Luo, Optoelectronics Letters 10, 140 (2014).
Zhao Bo, Li Li, Han Li and Hu Gui-jun, Journal of Optoelectronics·Laser 27, 1005 (2016). (in Chinese)
S. T. Le, M. E. McCarthy, E. Giacoumidis and N. J. Doran, Adaptive Time Synchronization and Frequency Offset Estimation for CO-OFDM, 9th International Symposium on Communication Systems, Networks & Digital Signal Processing, 2014.
Bai Cheng-lin and Cheng Zhi-hui, Optoelectronics Letters 12, 353 (2016).
Xinwei Du, Jing Zhang and Zhuoran Xu, Opt. Express 24, 19969 (2016).
Lingzi Wang, Tang Xianfeng, Zhang Xiaoguang, Xia Zhang and Xi Lixia, Modified Timing Synchronization Methods for CO-OFDM System Stressed by CD and PMD, Asia Communications and Photonics Conference, Optical Society of America, 2013.
Schmidl T M and Cox D C, IEEE Trans. Commun. 45, 1613 (1997).
Minn H, Zeng M and Bhargava V, Communications Letters 4, 242 (2000).
Park B, Cheon H and Kang C, Communications Letters 7, 239 (2003).
Huaizong Shao, Yang Li, Jiajia Tan, Yuezhu Xu and Guolian Liu, Robust Timing and Frequency Synchronization Based on Constant Amplitude Zero Autocorrelation Sequence for OFDM Systems, IEEE International Conference on Communication Problem-solving, 14 (2014).
Wang H, Zhu L, Shi Y and Wang Y, Comput. Inf. Syst. 8, 2275 (2012).
Silva C. Eric M, Harris Fredric J and Dolecek G. Jovanovic, Synchronization Algorithms Based on Weighted CAZAC Preambles for OFDM Systems, 13th International Symposium on Communications and Information Technologies, 192 (2013).
Jiantao Jia, Science and Technology 33, 66 (2015).
Oluyemi Omomukuyo, Deyuan Chang, Jingwen Zhu, Octavia Dobre and Ramachandran Venkatesan, Optics Express 23, 5377 (2015).
Li Li and Wu Di, Journal of Optoelectronics·Laser 26, 1692 (2015). (in Chinese)
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Li, L., Yao, W., Han, L. et al. A novel timing synchronization for CO-OFDM systems using CAZAC sequences. Optoelectron. Lett. 13, 225–228 (2017). https://doi.org/10.1007/s11801-017-7017-6
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DOI: https://doi.org/10.1007/s11801-017-7017-6