光学学报, 2017, 37 (9): 0906002, 网络出版: 2017-09-14   

基于时频域卡尔曼滤波的CO-OFDM系统相位噪声补偿算法 下载: 558次

Phase Noise Compensation Algorithm Based on Kalman Filtering in Time and Frequency Domains for CO-OFDM System
作者单位
1 浙江工业大学健行学院, 浙江 杭州 310023
2 浙江工业大学信息工程学院, 浙江 杭州 310023
3 上海交通大学区域光纤通信网与新型光通信系统国家重点实验室, 上海 200240
摘要
针对基于高阶正交幅度调制(QAM)的大线宽相干光正交频分复用(CO-OFDM)系统, 提出了一种基于时域和频域卡尔曼滤波(KF)联合估计的相位噪声补偿算法。所提算法在发射端插入时域训练符号和导频序列, 在接收端基于训练符号进行频域卡尔曼滤波后得到信道估计值, 进行时域扩展卡尔曼滤波(EKF)后得到相位噪声粗略估计值。时域相位噪声估计值为复数值, 为获得较好的补偿效果, 根据导频序列数目将每个OFDM符号分割为若干个亚符号。在导频序列处进行时域EKF, 通过在每个亚符号最后一个导频处进行线性插值, 得到每个采样点的相位噪声粗略估计值。对粗略相位噪声补偿后的频域数据进行预判决, 并对时域相位噪声进行精细补偿。采用所提算法对传输速率为50 Gbit·s-1 、传输距离为100 km的CO-OFDM系统进行了数值模拟, 结果表明所提算法与其他方法相比取得了较好的补偿效果。对于激光器线宽为1 MHz(16QAM)和800 kHz(32QAM) 的CO-OFDM系统, 误码率可达前向纠错上限。
Abstract
A phase noise compensation algorithm based on joint estimation of Kalman filtering (KF) in time and frequency domains is proposed aiming at higher-order quadrature amplitude modulation (QAM) based incoherent optical orthogonal frequency division multiplexing (CO-OFDM) system with large linewidth. Training symbols and pilot sequences in time domain are set in the transmitter. Frequency domain Kalman filtering is carried out based on training symbols at the receiver, and channel estimation value is obtained. Rough estimate value of phase noise is obtained with time domain extended Kalman filtering (EKF). The estimation value of phase noise in time domain is plural, and in order to obtain better compensation results, every OFDM symbol is divided into several sub-symbols according to the number of pilot sequences. Time domain EKF is carried out at the positions of pilot sequences. Rough estimation value of phase noise of every sampling point is obtained with linear interpolation at the last pilot of every sub-symbol. Predecision of frequency domain data after rough phase noise compensation and time domain phase noise fine compensation are carried out. Numerical simulation is performed by the proposed algorithm for CO-OFDM system with transmission rate of 50 Gbit·s-1 and transmission distance of 100 km. Results show that the compensation results achieved by the proposed method are better than that of other methods. When CO-OFDM system is with 16QAM and a laser linewidth of 1 MHz or with 32QAM and a laser linewidth of 800 kHz, bit error rate can reach the upper limit of forward error correction.

唐英杰, 董月军, 任宏亮, 卢瑾, 覃亚丽, 郭淑琴, 胡卫生. 基于时频域卡尔曼滤波的CO-OFDM系统相位噪声补偿算法[J]. 光学学报, 2017, 37(9): 0906002. Tang Yingjie, Dong Yuejun, Ren Hongliang, Lu Jin, Qin Yali, Guo Shuqin, Hu Weisheng. Phase Noise Compensation Algorithm Based on Kalman Filtering in Time and Frequency Domains for CO-OFDM System[J]. Acta Optica Sinica, 2017, 37(9): 0906002.

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