通信学报 ›› 2013, Vol. 34 ›› Issue (6): 38-48.doi: 10.3969/j.issn.1000-436X.2013.06.005
郭通,兰巨龙,黄万伟,张震
出版日期:
2013-06-25
发布日期:
2017-07-20
基金资助:
Tong GUO,Ju-long LAN,Wan-wei HUANG,Zhen ZHANG
Online:
2013-06-25
Published:
2017-07-20
Supported by:
摘要:
通过分析网络流量数据在FrFT域的统计特性发现,实际网络流量在FrFT域满足自相似性,进一步地,针对网络流量在 FrFT 域的“时域”和“频域”展开,分别给出了基于改进的整体经验模态分解—去趋势波动分析(MEEMD-DFA)的Hurst指数估计法以及基于加权最小二乘回归(WLSR)的Hurst指数自适应估计法。实验结果表明,相比于现有估值算法,MEEMD-DFA法具有较高的估计精度,但计算复杂度高;而FrFT自适应估计法则具有更优的估计顽健性,且计算复杂度较低,可作为一种实时在线估计真实网络数据Hurst指数的方法。
郭通,兰巨龙,黄万伟,张震. 分数阶Fourier变换域中网络流量的自相似特性分析[J]. 通信学报, 2013, 34(6): 38-48.
Tong GUO,Ju-long LAN,Wan-wei HUANG,Zhen ZHANG. Analysis the self-similarity of network traffic in fractional Fourier transform domain[J]. Journal on Communications, 2013, 34(6): 38-48.
表3
不同方法对FGN序列的Hurst指数估计结果"
H | Hurst指数估计方法 | [j1,j2] | ||||||
R/S | Periodogram | Wavelet | EMD-DFA | FrFT LASS | MEEMD-DFA | FrFT Adaptive | ||
0.55 | 0.556 | 0.523 | 0.566 | 0.534 | 0.584 | 0.556 | 0.552 | [7,16] |
0.60 | 0.614 | 0.581 | 0.607 | 0.582 | 0.628 | 0.586 | 0.652 | [5,16] |
0.65 | 0.659 | 0.647 | 0.664 | 0.669 | 0.661 | 0.640 | 0.652 | [5,16] |
0.70 | 0.698 | 0.701 | 0.695 | 0.721 | 0.682 | 0.677 | 0.698 | [6,16] |
0.75 | 0.774 | 0.739 | 0.756 | 0.772 | 0.732 | 0.741 | 0.750 | [6,16] |
0.80 | 0.799 | 0.815 | 0.806 | 0.824 | 0.809 | 0.782 | 0.805 | [5,16] |
0.85 | 0.825 | 0.849 | 0.878 | 0.875 | 0.835 | 0.857 | 0.847 | [7,16] |
0.90 | 0.853 | 0.884 | 0.942 | 0.927 | 0.873 | 0.909 | 0.895 | [7,16] |
0.95 | 0.907 | 0.965 | 0.984 | 0.978 | 0.939 | 0.960 | 0.953 | [5,16] |
表4
鲁估值算法对4类数据的Hurst指数估计的顽健性比较"
Hurst指数估计方法 | FGN | FGN+余弦周期信号 | FGN+高斯白噪声 | FGN+趋势项 |
R/S | 0.026 4 | 0.205 2 | 0.038 6 | 0.071 4 |
Periodogram | 0.015 5 | 0.049 9 | 0.080 4 | 0.241 2 |
Wavelet | 0.023 2 | 0.174 2 | 0.085 2 | 0.084 6 |
EMD-DFA | 0.023 9 | 0.280 6 | 0.114 1 | 0.023 9 |
FrFT LASS | 0.022 0 | 0.031 3 | 0.032 0 | 0.028 1 |
MEEMD-DFA | 0.013 7 | 0.119 8 | 0.039 7 | 0.013 7 |
FrFT Adaptive | 0.003 5 | 0.008 3 | 0.005 1 | 0.003 4 |
表6
4组实际网络流量数据的估计值"
流量数据 | 尺度/s | Wavelet | MEEMD-DFA | FrFT Adaptive |
1 | 0.834 | 0.847 | 0.848 | |
BC_pAug89.TL | 5 | 0.855 | 0.858 | 0.854 |
10 | 0.887 | 1.026 | 0.858 | |
1 | 0.804 | 0.926 | 0.947 | |
BC_pOct89.TL | 5 | 0.877 | 0.931 | 0.952 |
10 | 0.963 | 1.061 | 0.957 | |
1 | 0.905 | 0.886 | 0.917 | |
BC_Oct89Ext.TL | 5 | 0.921 | 0.907 | 0.921 |
10 | 0.954 | 0.919 | 0.926 | |
1 | 0.861 | 0.913 | 0.942 | |
BC_Oct89Ext4.TL | 5 | 0.909 | 0.927 | 0.946 |
10 | 0.965 | 0.976 | 0.948 |
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