PDM-16QAM系统中几种相位估计算法的性能与复杂度比较以及改进

发布时间：2019-04-04 12:33

【摘要】：在偏分复用的高速相干光通信系统中,16进制正交幅度调制(PDM-16QAM)是最有前景的调制格式,且载波相位估计是补偿发射端与接收端激光器对信号造成的相位失真的重要技术。该领域最经常使用的算法为QPSK分区算法与盲相位搜索算法,但他们都有自己的缺点,如估计效果不够好,适用范围不够广,或者计算复杂度过高。本论文实验搭建了224Gb/s PDM-16QAM波分复用传输640km相干检测系统平台,首先利用几种基于前述两种算法的相位估计方法对接收到的信号进行了数据处理,分别给出了误码率曲线图、误差向量幅度曲线图、计算复杂度分析表。然后基于性能最优与计算复杂度的平衡,提出了针对16QAM信号星座图中间圈的点的省略两级处理算法。将该改进的算法用于实验系统相位估计单元进行数据处理,结果表明,改进的算法P1,3/ML其误码率性能和误差向量幅度性能基本保持不变,但是计算复杂度降低为原来的1/2。
[Abstract]:In high-speed coherent optical communication systems with partial division multiplexing, hexadecimal orthogonal amplitude modulation (PDM-16QAM) is the most promising modulation format. The carrier phase estimation is an important technique to compensate the phase distortion caused by the transmitter and receiver lasers. The most commonly used algorithms in this field are QPSK partition algorithm and blind phase search algorithm, but they all have their own shortcomings, such as not good estimation effect, not wide enough range of application, or high computational complexity. In this paper, the platform of 640km coherent detection system for 224Gb/s PDM-16QAM wavelength division multiplexing transmission is set up. Firstly, several phase estimation methods based on the two algorithms are used to process the received signals. The error rate curve, error vector amplitude curve and computational complexity analysis table are given respectively. Then, based on the balance between optimal performance and computational complexity, a two-level algorithm for omitting points in the middle circle of 16QAM constellation is proposed. The improved algorithm is applied to the data processing of the phase estimation unit of the experimental system. The results show that the bit error rate performance and the error vector amplitude performance of the improved algorithm P 1 and 3 ML are basically unchanged. However, the computational complexity is reduced to the original 1-2.
【作者单位】：北京邮电大学信息光子学与光通信国家重点实验室;香港理工大学;
【基金】：国家自然科学基金(61205065) 高等学校博士学科点专项科研基金(20110005110014)资助项目
【分类号】：TN929.11

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