cp0802_add_noise.m

uwb无线电基础书本（电子工业出版社）的MATLAB程序

function [y] = cp0802_add_noise(x,SNR)
X_POWER = var(x);
linear_SNR = 10^(SNR/10);
noise_sigma = X_POWER/linear_SNR;
noise_scale_factor = sqrt(noise_sigma);
noise = randn(1,length(x))*noise_scale_factor;
%y = y(1:length(x));
y = x + noise;