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untitled
数字基带传输基带信号,指未经调制的信号。这些信号的特征是其频谱从零频或很低频率开始,占据较宽的频带。
基带信号在传输前,必须经过一些处理或者某些变换(如码型变换、波形和频谱变换)才能送入信道中传输。处理或变换的目的是使信号的特性与信道的传输特性相匹配。
数字基带信号是消息代码的波形表示。表示形式有多种,有单极性、双极性波形,归零和非归零波形,差分波形、多电平波形之分,各自有不同的特点。
研究数字基带信号通过加性高斯白噪声信道的传输,并且假设信道除了叠加高斯噪声外,不会对信号产生其他失真。(matlabSimulation(pulse amplitude modulation) modulation signal in AWGN (additive white Gaussian noise AWGN (Additive White Gaussian Noise)) under the channel bit error rate and bit error rate performance, and compared with the theoretical value.)
- 2018-05-08 18:47:36下载
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小波变换源码
说明: 带有多种小波基的小波变换程序,可用于图象识别,信号突变检测。(with multiple small Porgy wavelet transform procedures can be used to image recognition, signal mutation detection.)
- 2006-01-04 14:14:32下载
- 积分:1
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flourierwavelet
使用傅里叶变换和小波变换提取心电信号中的呼吸信号(Using the Fourier transform and the wavelet transform to extract the breathing signal ECG)
- 2013-03-06 11:08:15下载
- 积分:1
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wavelet-analysis-important
小波变换是一种非常重要的时频分析方法,研究小波变换对于地震处理研究有着非常重要的作用(Wavelet transform is a important tool for time-frequency,which plays an important part in the seismic processing.)
- 2013-01-27 17:17:32下载
- 积分:1
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wvd
这是一个轴承故障分解程序,给予小波变换,小波去噪,小波重构与EMD相结合,有时频谱,边际谱,功率谱(This is a to bearing failure decomposition program given wavelet transform, wavelet denoising wavelet reconstruction combined with EMD, sometimes the spectrum, marginal spectrum, power spectrum)
- 2012-11-26 15:15:09下载
- 积分:1
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stft
一维向量的离散短时Fourier变换函数。函数名:stft,输入:要处理的一维数组,加窗:矩形窗,窗口宽度:20。(One-dimensional vector of discrete short-time Fourier transform function. Function name: stft, enter: To deal with the one-dimensional array, plus a window: rectangular windows, window width: 20.)
- 2008-04-16 15:42:25下载
- 积分:1
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electric1
利用小波变换实现对电能质量检测的算法实现(using wavelet transform to detect power quality algorithm)
- 2007-01-17 16:24:47下载
- 积分:1
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ISARchengxiangfangzhen
设定雷达和目标参数,选取目标中心与雷达的距离为参考距离,采取dechirp方式接收信号,直接对回波信号进行二维FFT得到的成像结果,并采用Keystone法(即重采样法)校正越距离单元徙动。(Set the radar and the target parameters, select the center of the target and the distance from the radar as the reference distance, take reception dechirp signal, directly on the echo signals, the imaging results obtained by the two-dimensional FFT, and the Keystone method (i.e., re-sampling) Vietnam correction range cell migration.)
- 2013-05-20 15:43:22下载
- 积分:1
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二维S变换
能够实现二维S变换的MATLAB程序,与Stockwell的经典程序不同(the code which can implements the 2D S-transform)
- 2018-05-09 14:32:07下载
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wavelet
关于小波变换的一些常用函数,有关多尺度变换,希望可以帮助您(Wavelet commonly used functions, on multi-scale transformation, I hope to help you)
- 2019-03-27 20:49:30下载
- 积分:1