基于无迹卡尔曼滤波的CO-OFDM系统相位噪声补偿算法

发布时间：2018-06-07 21:07

本文选题：光通信 + 相干光正交频分复用　；参考：《中国激光》2017年11期

【摘要】：基于高阶正交幅度调制(QAM)和大线宽相干光正交频分复用(CO-OFDM)系统,提出了一种在时域进行无迹卡尔曼滤波(UKF)的相位噪声补偿算法。该算法在接收端基于训练符号频域卡尔曼滤波实现信道均衡,用较小的频域导频数据开销进行频域扩展卡尔曼滤波,先补偿公共相位误差(CPE)噪声,然后将CPE噪声补偿之后的数据在时域进行载波间干扰(ICI)相位噪声粗补偿。对相位噪声粗补偿后的频域数据进行预判决,结合接收端原始时域数据,在时域对判决后的数据进行UKF以实现ICI相位噪声的精细补偿。对精细补偿之后的频域数据再进行相位噪声粗补偿并进行迭代运算,极大地提高了相位噪声的补偿效果。对50Gbit·s-1的CO-OFDM系统进行了传输距离为100km的仿真,与其他算法相比,所提算法的频谱利用率极高,且具有较好的补偿效果。对激光器线宽为700kHz且调制方式为32QAM的传输信号进行二次迭代后,所提相位噪声补偿算法的误码率性能仍可达到前向纠错上限。所提算法促进了大线宽CO-OFDM系统在长距离接入网和城域网中的应用。
[Abstract]:Based on high order quadrature amplitude modulation (QAM) and large linewidth coherent optical orthogonal frequency division multiplexing (OFDM) system, a phase noise compensation algorithm for unscented Kalman filter (UKF) in time domain is proposed. The algorithm realizes channel equalization based on training symbol frequency domain Kalman filter at the receiving end. It uses small frequency domain pilot data overhead to carry out frequency domain extended Kalman filter, and first compensates the common phase error (CPE) noise. Then the data after CPE noise compensation is used to compensate the ICI phase noise in time domain. The frequency domain data after rough compensation of phase noise are pre-determined, combined with the original time domain data of the receiver, and UKF is carried out in the time domain to realize the fine compensation of the phase noise of ICI. The phase noise compensation is performed on the frequency domain data after fine compensation and iterative operation is carried out, which greatly improves the compensation effect of phase noise. The transmission distance of 50Gbit s ~ (-1) CO-OFDM system is simulated with 100km. Compared with other algorithms, the proposed algorithm has high spectral efficiency and good compensation effect. After the second iteration of the transmitted signal with 700kHz linewidth and 32QAM modulation, the BER performance of the proposed phase noise compensation algorithm is still up to the upper limit of forward error correction. The proposed algorithm promotes the application of large linewidth CO-OFDM systems in long distance access networks and metropolitan area networks.
【作者单位】：浙江工业大学信息工程学院;浙江工业大学健行学院;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;
【基金】：国家自然科学基金(60907032,61675184,61675183) 浙江省自然科学基金(LY16F050009) 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开放基金(2016GZKF0JT004)
【分类号】：TN929.1

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