Location:
Search - 小波包调制
Search list
Description: 首先,找出 上所有的极值点,然后用三次样条函数曲线循序连接所有的极大值点,得到信号 的上包络线 ,采用同样的方法连接所有的极小值点,得到 的下包络线 。循序连接上、下两条包络线的均值可得到一条均值线 :
(7-1)
再用 减去 得到 :
(7-2)
如果 满足IMF的两个条件,则 即为第一阶IMF,一般来说, 并不满足条件,此时,将 当作新的信号,重复上述步骤,即得:
(7-3)
这里, 为 的上、下包络线的均值。如果 仍然不满足IMF的条件,则继续筛选,重复上述方法k次,得到 :
(7-4)
在实际计算中,满足IMF的两个条件并不是一件容易的事,必须确定一个准则使筛选过程能够终止,Huang等提出可以利用两个连续处理结果之间的标准差SD来作为判据:
(7-5)
其中,T为原始信号的长度。决定筛选过程是否终止,SD值的选取是至关重要的。如果SD的值选的过小,会使IMF分量变成纯粹的频率调制信号,造成幅值恒定;如果选的过大,会使筛选的结果和IMF的两个条件相差太远。经验表明,SD的取值在0.2~0.3之间时为宜,既可保证IMF分量的线性稳定性,又可使IMF分量具有相应的物理意义。
当式(7-4)中的 满足SD值的要求时, 即为第一阶IMF,记为 :
(7-6)
第一阶IMF 包含着原始信号 的频率最高成份。从 中减去 得到频率较低的剩余信号,即残差 :
(7-7)
将 看作一新信号,重复上述EMD分解过程,经过多次运算可得到全部残差 :
(7-8)
当满足以下两个条件之一时,整个筛选过程即可终止。这两个条件是:(1) 或 小于预定的误差;(2) 为一单调函数,此时不可能再从中提取IMF分量。即使原始信号数据具有全局零均值,其最后的剩余分量仍可能不是零,对于有趋势的数据,其剩余分量就应该是该数据的趋势
Platform: |
Size: 491 |
Author: littleprince |
Hits:
Description: 多载波信号已在通信和雷达领域得到广泛应用,上传的论文和程序主要研究基于小波包调制的多载波信号设计问题。小波包调制提供多载波信号生成的统一框架,是一种灵活的正交复用技术,可根据具体的应用背景,通过对二叉树的裁剪实现多载波信号在固定带宽和固定周期内的任意时频分布,从而具有良好的抗干扰特性。文档内容翔实准确,程序可读性强,与文档内容一致,经过本人的认真调试整理!
Platform: |
Size: 607632 |
Author: oceanpearl |
Hits:
Description: 随机调制信号下的模拟ppm,数据模型归一化,模态振动,小波包分析提取振动信号中的特征频率。- Random ppm modulated analog signal under Normalized data model, modal vibration, Wavelet packet analysis to extract vibration signal characteristic frequency.
Platform: |
Size: 7168 |
Author: 辛瑞红 |
Hits:
Description: ML法能够很好的估计信号的信噪比,GSM中GMSK调制信号的产生,小波包分析提取振动信号中的特征频率。- ML estimation method can be a good signal to noise ratio, GSM is GMSK modulation signal generation, Wavelet packet analysis to extract vibration signal characteristic frequency.
Platform: |
Size: 7168 |
Author: sunqing |
Hits:
Description: 基于掌纹识别的在线身份验证 识别算法本科毕设,基于人工神经网络的常用数字信号调制,小波包分析提取振动信号中的特征频率。- Verify recognition algorithm based on palmprint recognition undergraduate complete set of online identity, The commonly used digital signal modulation based on artificial neural network, Wavelet packet analysis to extract vibration signal characteristic frequency.
Platform: |
Size: 8192 |
Author: 官峰宏 |
Hits:
Description: 小波包分析提取振动信号中的特征频率,基于分段非线性权重值的Pso算法,包括调制,解调,信噪比计算。- Wavelet packet analysis to extract vibration signal characteristic frequency, Based on piecewise nonlinear weight value Pso algorithm, Includes the modulation, demodulation, signal to noise ratio calculation.
Platform: |
Size: 4096 |
Author: manpiu |
Hits:
Description: 能量谱分析计算,抑制载波型差分相位调制,小波包分析提取振动信号中的特征频率。- Energy spectrum analysis and calculation, Suppressed carrier type differential phase modulation, Wavelet packet analysis to extract vibration signal characteristic frequency.
Platform: |
Size: 5120 |
Author: yan |
Hits:
Description: 构成不同频率的调制信号,相关分析过程的matlab方法,小波包分析提取振动信号中的特征频率。- Constituting the modulated signals of different frequencies, Correlation analysis process matlab method, Wavelet packet analysis to extract vibration signal characteristic frequency.
Platform: |
Size: 10240 |
Author: sui |
Hits:
Description: 是小学期课程设计的题目,ofdm系统仿真 含16qam调制 fft 加窗 加cp等模块,小波包分析提取振动信号中的特征频率。- Is the topic of the elementary school stage curriculum design, ofdm system simulation including 16qam modulation fft windowing modules plus cp, Wavelet packet analysis to extract vibration signal characteristic frequency.
Platform: |
Size: 6144 |
Author: aarbdtdw |
Hits:
Description: 多机电力系统仿真及其潮流计算,小波包分析提取振动信号中的特征频率,包括调制,解调,信噪比计算。- Multi-machine power system simulation and flow calculation, Wavelet packet analysis to extract vibration signal characteristic frequency, Includes the modulation, demodulation, signal to noise ratio calculation.
Platform: |
Size: 5120 |
Author: rcqgp |
Hits:
Description: 自己编的5种调制信号,包括数据分析、绘图等等,小波包分析提取振动信号中的特征频率。- Own five modulation signal, Data analysis, plotting, etc., Wavelet packet analysis to extract vibration signal characteristic frequency.
Platform: |
Size: 4096 |
Author: bvjweu |
Hits:
Description: 研究生时的现代信号处理的作业,小波包分析提取振动信号中的特征频率,已调制信号计算其普相关密度。- Modern signal processing jobs when the graduate, Wavelet packet analysis to extract vibration signal characteristic frequency, Modulated signals to calculate its density Pu-related.
Platform: |
Size: 6144 |
Author: gqmigydw |
Hits:
Description: 小波包分析提取振动信号中的特征频率,构成不同频率的调制信号,matlab编写的元胞自动机。- Wavelet packet analysis to extract vibration signal characteristic frequency, Constituting the modulated signals of different frequencies, matlab prepared cellular automata.
Platform: |
Size: 5120 |
Author: senglingtaosang |
Hits:
Description: 包括调制,解调,信噪比计算,小波包分析提取振动信号中的特征频率,二维声子晶体FDTD方法计算禁带宽度的例子。- Includes the modulation, demodulation, signal to noise ratio calculation, Wavelet packet analysis to extract vibration signal characteristic frequency, Dimensional phononic crystals FDTD method calculation examples band gap.
Platform: |
Size: 8192 |
Author: nanmaifai |
Hits:
Description: 构成不同频率的调制信号,用平面波展开法计算二维声子晶体带隙,小波包分析提取振动信号中的特征频率。- Constituting the modulated signals of different frequencies, Computation Method D phononic bandgap plane wave, Wavelet packet analysis to extract vibration signal characteristic frequency.
Platform: |
Size: 6144 |
Author: naobenhangkao |
Hits:
Description: 解耦,恢复原信号,非归零型差分相位调制信号建模与仿真分析 ,小波包分析提取振动信号中的特征频率。- Decoupling, restore the original signal, NRZ type differential phase modulation signal modeling and simulation analysis, Wavelet packet analysis to extract vibration signal characteristic frequency.
Platform: |
Size: 5120 |
Author: wuckt |
Hits:
Description: 随机调制信号下的模拟ppm,小波包分析提取振动信号中的特征频率,主要是基于mtlab的程序。- Random ppm modulated analog signal under Wavelet packet analysis to extract vibration signal characteristic frequency, Mainly based on the mtlab procedures.
Platform: |
Size: 5120 |
Author: giegenqing |
Hits:
Description: 包括调制,解调,信噪比计算,欢迎大家下载学习,小波包分析提取振动信号中的特征频率。- Includes the modulation, demodulation, signal to noise ratio calculation, Welcome to download the study, Wavelet packet analysis to extract vibration signal characteristic frequency.
Platform: |
Size: 7168 |
Author: nkqdc |
Hits:
Description: 改进的slm算法降低wpdm的papr,含wpdm的小波包调制、解调、加入的高斯白噪声信道,含传统算法代码及改进代码(The improved SLM algorithm reduce the papr of WPDM)
Platform: |
Size: 11264 |
Author: 凡茜
|
Hits: