Simple blind estimation of sampling frequency offset for real-time asynchronous DDO-OFDM system

Simple blind estimation of sampling frequency offset for real-time asynchronous DDO-OFDM system
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实时异步DDO-OFDM系统采样频偏的简单盲估计

DOI:
10.1016/j.optcom.2021.126890
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发表时间:
2021-02
影响因子:
2.4
通讯作者:
Wen Hong
Wen Hong
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Luo Zhibin;Chen Ming;Chen Qinghui;Wen Hong

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采样频率偏移(SFO)会导致相位旋转、通道间干扰和符号间干扰,从而严重降低异步直接检测光正交频分复用(DDO-OFDM)的传输性能。在本文中,我们研究了 DDO-OFDM 系统中一种简单且无开销的 SFO 盲估计技术。通过理论分析、数值模拟和实验对该技术的关键参数进行了优化。还提出了一种简化的SFO盲估计方法,以进一步降低硬件实现复杂度。在实时异步DDO-OFDM传输系统中对SFO估计的准确性和稳定性进行了实验研究。结果表明,SFO估计精度可以在±1.5 ppm以内,并且在20公里标准单模光纤传输后,即使SFO高达200 ppm,也表现出较高的稳定性。
Sampling frequency offset (SFO) will result in phase rotation, inter-channel interference, and inter-symbol interference, which can seriously degrade the transmission performance of the asynchronous direct-detection optical OFDM (DDO-OFDM). In this paper, we study a simple and overhead-free SFO blind estimation technique in a DDO-OFDM system. The key parameters in this technique are optimized by theoretical analysis, numerical simulation, and experiments. A simplified method of the SFO blind estimation is also proposed to further reduce the hardware implementation complexity. The accuracy and stability of the SFO estimation are experimentally investigated in the real-time asynchronous DDO-OFDM transmission system. The results indicate that the SFO estimation accuracy can be within±1.5 ppm and shows high stability even at an SFO of up to 200 ppm after 20-km standard single-mode fiber transmission.
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