Question

matlab如何添加自定义信噪比的噪声信号？

Answer 1

clear all;

close all;

x=0:0.2:10;

data1=sin(x);

plot(x,data1);

hold on;

data2=awgn(data1,10*log10(0.05));

plot(x,data2,'r-');

hold off;

扩展资料

matlab添加白噪声叠加到信号：

function [Y,NOISE] = noisegen(X,SNR)

% noisegen add white Gaussian noise to a signal.

% [Y, NOISE] = NOISEGEN(X,SNR) adds white Gaussian NOISE to X.  The SNR is in dB.

NOISE=randn(size(X));

NOISE=NOISE-mean(NOISE);

signal_power = 1/length(X)*sum(X.*X);

noise_variance = signal_power / ( 10^(SNR/10) );

NOISE=sqrt(noise_variance)/std(NOISE)*NOISE;

Y=X+NOISE;

其中X是纯信号，SNR是要求的信噪比，Y是带噪信号，NOISE是叠加在信号上的噪声。