中国激光, 2014, 41 (s1): s105005, 网络出版: 2014-07-03  

窄带滤波损伤正交相移键控光信号的质量估计新算法

Novel Performance Estimation for QPSK Signals Impaired by Narrow Filtering
作者单位
哈尔滨工业大学深圳研究生院, 广东 深圳 518055
摘要
理论上提出了窄带损伤条件下的误差向量幅度的新算法,该修正算法可有效去除滤波引起的码间干扰因素,从而能利用计算的误差向量幅度更准确地估计系统光信噪比与误码率。通过数值仿真发现,新的算法能够有效地估计接收光信噪比,在加入码间串扰修正后的误差向量幅度对误码率的估计也有提高。同时,论文讨论了干扰码元个数的优化问题,以获得在计算复杂度与性能之间的最佳平衡,还分析在不同系统参数包括信噪比与滤波带宽下的估计性能表现。
Abstract
A new algorithm of error vector magnitude (EVM) for quadrature phase shift keying (QPSK) signals impaired by narrow filtering is proposed theoretically in this paper. The new algorithm can remove the influence of intersymbol interference (ISI) induced by filtering, so the calculated EVM can be utilized for accurate estimation on optical signal to noise ratio and bit error rate. The numerical results also confirmed that the proposed scheme has better estimation accuracy on optical signal to noise ratio, and the modified algorithm taking into account the ISI-induced distortion can improve the estimation accuracy of bit error rate. Meanwhile, the interference-related symbol number is discussed for trade-off between computation efficiency and estimation performance, and the estimation performance is analyzed under different system conditions, including optical signal to noise and filter bandwidth.

朱宇鹏, 杨彦甫, 颜丙阳, 钟杰昌, 曹剑超, 姚勇. 窄带滤波损伤正交相移键控光信号的质量估计新算法[J]. 中国激光, 2014, 41(s1): s105005. Zhu Yupeng, Yang Yanfu, Yan Bingyang, Zhong Jiechang, Cao Jianchao, Yao Yong. Novel Performance Estimation for QPSK Signals Impaired by Narrow Filtering[J]. Chinese Journal of Lasers, 2014, 41(s1): s105005.

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