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本文提出一种新的基于CAZAC序列的CO-OFDM系统的同步算法。算法利用一个重新设计的加权CAZAC序列作为训练符号进行符号定时同步与载波频偏估计。该算法使用重新设计的训练符号使整数倍频偏估计的复杂度有效降低,并能够估计出[-5GHz,5GHz]范围内的所有频偏,满足实际系统的需要。由于对CAZAC序列进行加权,这极大地提高了系统的定时同步性能。该算法在基于100Gb/s 16-QAM PDM-CO-OFDM系统中进行仿真,仿真结果证明了算法的可行性与正确性。
This paper presents a new synchronization algorithm for CO-OFDM system based on CAZAC sequence. The algorithm uses a redesigned weighted CAZAC sequence as a training symbol for symbol timing synchronization and carrier frequency offset estimation. The algorithm uses the redesigned training symbols to effectively reduce the complexity of the integer multiple frequency offset estimation and can estimate all the frequency offsets in [-5GHz, 5GHz] range to meet the needs of the actual system. Due to the weighting of the CAZAC sequences, this greatly improves the system’s timing synchronization performance. The algorithm is simulated in a 100Gb / s 16-QAM PDM-CO-OFDM system. The simulation results show that the algorithm is feasible and correct.