中国激光, 2020, 47 (11): 1106001, 网络出版: 2020-10-28 复制并引用该论文  本文已被引 4 次  被引通知

图 & 表

图 1. CO-FBMC-OQAM系统信号传输模型

Fig. 1. Signal transmission model of CO-FBMC-OQAM system

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图 2. PHYDYAS原型滤波器波形图(K=4,M=512)

Fig. 2. Waveform of the PHYDYAS prototype filter (K=4,M=512)

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图 3. 本文所提出的训练序列结构图

Fig. 3. Diagram of the training sequence presented in this paper

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图 4. 训练序列的共轭对称性

Fig. 4. Conjugate symmetry of the training sequence

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图 5. PHYDYAS 原型滤波器的固有虚部干扰。(a) n为偶数;(b) n为奇数

Fig. 5. Intrinsic imaginary interference of PHYDYAS prototype filter. (a) n is even; (b) n is odd

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图 6. CO-FBMC-OQAM 系统数值仿真结构图

Fig. 6. Simulation diagram of the CO-FBMC-OQAM system

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图 7. CO-FBMC-OQAM 系统的定时度量函数。(a)不使用PN序列;(b)使用PN序列

Fig. 7. Timing metric function of the CO-FBMC-OQAM system. (a) Without PN sequence; (b) with PN sequence

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图 8. 本文所提方法在线性光纤信道中的信道估计能力。(a)背靠背情景下的光信噪比与误比特率曲线;(b)经1000 km SSMF传输后的光信噪比与误比特率曲线;(c)光信噪比为20 dB时误比特率与光纤长度变化关系

Fig. 8. Channel-estimation capability of the proposed method in the linear fiber channel. (a) BER versus OSNR curves for the back-to-back scenario; (b) BER performance versus OSNR after 1000-km SSMF transmission; (c) BER as a function of fiber length when OSNR is 20 dB

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图 9. 经过500 km非线性光纤传输后不同方法的误码率与发射功率曲线,插图显示的是发射功率为-6 dBm时的信号解调星座图

Fig. 9. BER curves with the change of launching power for different methods after a 500-km nonlinear fiber transmission, in which the inset shows the signal demodulation constellation when the transmitting power is -6 dBm

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表 1CO-FBMC-OQAM系统仿真参数

Table1. Simulation parameters of the CO-FBMC-OQAM system

Parameter Value Time domain sampling points 218 Sample rate 50 GSa/s Number of effective subcarriers 256 Discrete Fourier transform length 512 Prototype filter name PHYDYAS Prototype filter overlap factor 4 QAM modulation index 16 Optical carrier center frequency 193.4 THz Laser wavelength 1550.12 nm

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刘俊杰, 王道斌, 拓明珊, 王伟, 元丽华, 曹明华, 王惠琴. 相干光FBMC-OQAM系统的时间偏移和信道联合估计算法[J]. 中国激光, 2020, 47(11): 1106001. Liu Junjie, Wang Daobin, Tuo Mingshan, Wang Wei, Yuan Lihua, Cao Minghua, Wang Huiqin. Joint Estimation Algorithm of Time Offset and Channel Response for Coherent Optical FBMC-OQAM Systems[J]. Chinese Journal of Lasers, 2020, 47(11): 1106001.