针对传统算法在信噪比(SNR)较低且存在传输色散的场景同步误差大的问题,发现了一种基于反正切运算的伪随机序列,能够对传统的Awoseyila 定时同步算法进行优化,同时借鉴ES-CAZAC序列的部分思想,提出反正切伪随机序列CO-OFDM光纤传输定时同步算法。仿真实验表明,所提算法可以在低SNR和传输色散场景下有效降低定时同步误差。

A novel pseudo-random preamble aided timing estimation via arc-tangent operation for CO-OFDM was proposed to tackle with the problems of lower SNR and more synchro errors under the context of transmission dispersion existing in traditional algorithm. The Awoseyila's algorithm could be optimized via the proposed method. Moreover, with using the line of ES-CAZAC preamble for reference, the arc-tangent pseudo-random preamble was proposed. Simulations were showed that the proposed method had much lower estimation error than traditional methods.