Visible Light Communication (VLC) systems are more vulnerable to timing synchronization problems due to the employed incoherent modulation scheme. In this work, a blind timing synchronization algorithm is introduced to DC biased Optical Orthogonal Frequency Division Multiplexing (DCO-OFDM) systems, based on cyclostationarity of the received signal that relies on second-order statistics only. It does not require any channel impulse response, as it is a blind estimator. The performance of the proposed estimator is evaluated using computer simulations in the Lab-view software and also validated through experimental results obtained using the VLC testbed using Universal Software defined Radio Peripheral (USRP) hardware.

中文翻译：

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DCO-OFDM VLC系统的盲定时同步算法


由于采用非相干调制方案，可见光通信（VLC）系统更容易受到定时同步问题的影响。在这项工作中，基于仅依赖于二阶统计的接收信号的循环平稳性，将盲定时同步算法引入到直流偏置光正交频分复用（DCO-OFDM）系统中。它不需要任何信道脉冲响应，因为它是盲估计器。所提出的估计器的性能通过 Lab-view 软件中的计算机模拟进行评估，并通过使用通用软件定义无线电外设 (USRP) 硬件的 VLC 测试台获得的实验结果进行验证。