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Symbol synchronization and sampling frequency synchronization techniques in real-time DDO-OFDM systems

机译:实时DDO-OFDM系统中的符号同步和采样频率同步技术

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摘要

In this paper, we propose and experimentally demonstrate a symbol synchronization and sampling frequency synchronization techniques in real-time direct-detection optical orthogonal frequency division multiplexing (DDO-OFDM) system, over 100-km standard single mode fiber (SSMF) using a cost-effective directly modulated distributed feedback (DFB) laser. The experiment results show that the proposed symbol synchronization based on training sequence (TS) has a low complexity and high accuracy even at a sampling frequency offset (SFO) of 5000-ppm. Meanwhile, the proposed pilot-assisted sampling frequency synchronization between digital-to-analog converter (DAC) and analog-to-digital converter (ADC) is capable of estimating SFOs with an accuracy of < ±5-ppm for initial SFOs as large as 1000-ppm. Moreover, the sampling frequency synchronization technique can also compensate SFO effects within a small residual SFO caused by deviation of SFO estimation and low-precision or unstable clock source. The two synchronization techniques are suitable for high-speed DDO-OFDM transmission systems.
机译:在本文中,我们提出并通过实验证明了在100公里标准单模光纤(SSMF)上使用成本直接在实时直接检测光学正交频分复用(DDO-OFDM)系统中进行的符号同步和采样频率同步技术有效的直接调制分布式反馈(DFB)激光器。实验结果表明,即使在5000ppm的采样频率偏移(SFO)下,基于训练序列(TS)的符号同步也具有较低的复杂度和较高的精度。同时,建议的数模转换器(DAC)和模数转换器(ADC)之间的导频辅助采样频率同步能够以高达±±5 ppm的精度估算初始SFO时的SFO。 1000 ppm。而且,采样频率同步技术还可以补偿由于SFO估计的偏差和低精度或不稳定的时钟源而在较小的残留SFO中产生的SFO效应。两种同步技术适用于高速DDO-OFDM传输系统。

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