psd归一化MATLAB
时间: 2023-10-29 10:04:50 浏览: 295
在MATLAB中,归一化PSD(功率谱密度)可以通过将功率谱除以信号长度来实现。归一化的目的是使得在不同信号长度下比较不同信号的功率谱更加方便。具体而言,可以通过使用`psd`函数计算出功率谱密度,然后将结果除以信号长度来实现归一化。例如,以下是MATLAB代码示例:
```matlab
clear;
Fs = 1000; % 采样频率
n = 0:1/Fs:1; % 产生含有噪声的序列
xn = cos(2*pi*40*n) + 3*cos(2*pi*100*n) + randn(size(n));
window = boxcar(length(xn)); % 矩形窗
nfft = 1024;
[Pxx, f = periodogram(xn, window, nfft, Fs); % 直接法
normalized_Pxx = Pxx / length(xn); % 归一化PSD
plot(f, 10*log10(normalized_Pxx));
```
以上代码先生成含有噪声的序列`xn`,然后使用`periodogram`函数计算出直接法得到的功率谱密度`Pxx`,最后将其除以序列长度`length(xn)`来得到归一化的PSD `normalized_Pxx`。最后使用`plot`函数绘制归一化PSD的图形。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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