Abstract

To improve the spectral efficiency of a full spectrum modulated nonlinear frequency division multiplexing (FS-NFDM) system, a blind frequency offset estimation (FOE) method has been proposed. The approach based on the minimum phase correction error can achieve high estimation accuracy of sub-MHz without need of any training symbols. Furthermore, in order to reduce the computational complexity, an eigenvalue-shift method is used to get a coarse search interval of FO, and then the one-dimensional optimization algorithm based on golden section search and parabolic interpolation is used to get the optimal FOE for the coarse search interval. The feasibility and reliability of the proposed blind FOE approach have been demonstrated in both BTB and fiber transmission scenarios. Compared with the grid search method, the proposed solving scheme can save hundreds of times of the searches. The experimental results reveal that the proposed method is robust to the amplified spontaneous emission noise and phase noise and has the capabilities of a wide FOE range and a high FOE accuracy.

© 2024 Optica Publishing Group

Joint equalization of frequency offset and phase noise using two-stage cascaded extended Kalman filter for discrete spectrum 16/64APSK NFDM systems

Hongbing Gao, Hengying Xu, Tingting Dong, Donghu Yao, Yining Zhang, Chenglin Bai, Lishan Yang, Xusheng Li, Zukai Sun, and Yaxuan Fan
Opt. Express 32(4) 6366-6381 (2024)

Frequency offset drift monitoring: enabling simultaneously optimum performance and minimum cost of frequency offset estimation

Jianing Lu and Chao Lu
Opt. Lett. 44(15) 3753-3756 (2019)

ASE noise mitigation with digital frequency offset loading for discrete spectrum nonlinear frequency division multiplexing systems

Yanfeng Bi, Hengying Xu, Yining Zhang, Chenglin Bai, Donghu Yao, Tingting Dong, HongBing Gao, Lishan Yang, and Lixia Xi
Opt. Lett. 48(21) 5707-5710 (2023)

Blind frequency offset estimation using the optimal decision threshold-assisted QPSK-partition method for probabilistically shaped MQAM systems

Xue Tang, Hengying Xu, Chenglin Bai, Yaxuan Fan, Yining Zhang, Lishan Yang, Lingguo Cao, Weibin Sun, and Nan Cui
Opt. Express 30(20) 37175-37192 (2022)

Frequency offset estimation for nonlinear frequency division multiplexing with continuous spectrum modulation

Yonghua He, Jianping Li, Jianqing He, Yuwen Qin, Xinkuo Yu, Ning Lin, Gai Zhou, Meng Xiang, and Songnian Fu
Opt. Express 31(20) 32887-32899 (2023)