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用Welch法进行功率谱估计
考虑L的三个不同值：L＝256（3个数据段），L＝128(7个数据段)和L=64（15个数据段）。各自的谱估计图如上图所示。可以明显的看到，加窗明显的减小了频谱上的假谱峰，但也更加进一步平滑了谱峰。所以，对于L＝64的情况，在ω＝0.8π的谱线可以很确定的辨认，但是那两个靠近的谱峰不容易区分。对于L＝128的情况，这种情况提供了在分离和检测间最好的均衡。当然，对于在L＝256时的情况，效果是更好的，能够从谱估计图上明显的分辨出三条谱线的存在以及它们幅度关系的强弱。 除了Welch法外，还可以采用对多个周期图求平均的功率谱估计方法的其他方法如Bartlett法等等，在功率谱估计上也能取得较好的结果。(consider three different values : L = 256 (3 data), L = 128 (7 data) and L = 64 (15 data). Their spectral estimation map as shown in Fig. It is clear to see that increase significantly decreasing window of the spectrum of false peaks, but much more to further smooth the peaks. Therefore, L = 64, in the case = 0.8 spectrum can determine the identification, but that the two peaks around is not easy to distinguish. L = 128 for the situation, which provided the separation and detection among the best balanced. Of course, L = 256 in the case, the effect is better, from the spectral estimation map clearly distinguish between the three lines of the existence and their relationship to the rate of strength. In addition to Welch law, but also can be used to map multiple cycle for the average power)
- 2005-07-12 11:18:13下载
- 积分：1
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zixiangguan
说明： 自相关的matlab程序。可以用于信号的周期性监测。(Since the procedures related to matlab. The cyclical nature of the signal can be used for monitoring.)
- 2009-08-12 10:52:32下载
- 积分：1
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Chaos_Toolbox
混沌时间序列预测程序与文档
包括CC方法、GP方法、Lyapunov指数预测等(Chaotic time series prediction method procedures and documentation, including CC, GP method, Lyapunov index prediction)
- 2010-05-16 14:40:32下载
- 积分：1
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genetic
filter design with the genetic algorithm
- 2013-10-11 21:39:19下载
- 积分：1
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fit_ellipse
最小二乘法椭圆拟合
fit_ellipse( x,y,axis_handle )
x，y为坐标点
适用于一般方程哦。好用(Least squares ellipse fitting fit_ellipse (x, y, axis_handle) x, y for the coordinates of points applicable to the general equation Oh. Use)
- 2009-02-04 14:52:20下载
- 积分：1
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HassenMIMOOFDM
MIMO-ofdm documents in pdf format
- 2009-05-07 10:26:29下载
- 积分：1
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DFTerive.m
Computes the Discrete Fourier Transform of a function.
- 2009-11-27 14:03:57下载
- 积分：1
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circonv
for circular convolution
- 2011-05-27 21:15:18下载
- 积分：1
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Hububianju
计算7个Hu不变矩，使用于图像处理中的目标识别(Calculate seven Hu invariant moments used in image processing, target recognition)
- 2013-05-14 20:09:26下载
- 积分：1
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bpnet
bp原理的源程序，可以自由下载，不涉及版权。(bp of the source principle, be free to download, do not involve copyright.)
- 2007-08-26 15:52:30下载
- 积分：1
