LI Li,YAO Wang,HAN Li,HU Gui-jun.Timing synchronization algorithm based on FH sequen- ce for coherent optical OFDM systems with carrier freq- uency offset[J].Optoelectronics Letters,2019,15(4):288-291 Timing synchronization algorithm based on FH sequen- ce for coherent optical OFDM systems with carrier freq- uency offset Author Name Affiliation LI Li  College of Communication Engineering, Jilin University, Changchun 130012, China  YAO Wang  College of Physics and Electronic Information, BaiCheng Normal University, Baicheng 137000, China  HAN Li  College of Physics, Jilin University, Changchun 130012, China  HU Gui-jun  College of Communication Engineering, Jilin University, Changchun 130012, China  Abstract:       A novel symbol timing synchronization algorithm based on Frank-Hermiller (FH) sequence is proposed for coherent optical orthogonal frequency-division multiplexing (CO-OFDM) systemswith carrier frequency offset. The timing synchronization is realized by using only one training symbol which is composed of conjugated symmetric sequences. The timing estimation of the proposed algorithm is robust to poor frequency offset. 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 frequency offset, the timing metric of the proposed method still maintains its peak value at the correct timing point, while the values are almost zero at all other positions. Hits: 693 Download times: 0 View Full Text    Download reader