例4：在sinc(t)信号中叠加噪声，分析对应频谱 fs=100 采样频率,必须大于两倍基带信号最高频率 ts=1/fs 采样时间间隔 T=2 时间窗大小 - x=x+0.1*randn(1,N) x=awgn(x,-10, measured ) figure plot(t,x) title( 时域信号图 ) xlabel( t /s ) y=fft(x,N) figure if mod(N,2)~=0

计算输入信号的功率，根据snr添加高斯白噪声，用randn函数实现-Calculation of the input signal power, according to the SNR adding Gaussian white noise, randn function

设置随机数，读取随机数，并显示波形，设置当前时间点，并显示当前时间-setup the randn waveform and time

对matlab通信仿真中噪声添加进行了定量分析，分别对awgn和randn加噪进行了编程实现，对于初学者掌握matlab噪声定量添加非常有帮助。-Communication Simulation of matlab noise addition quantitative analysis, respectively awgn and randn plus noise was programming for beginners to master matlab noise dosing very

Demo of adaBoost (adaptive boosting) Xu Cui 2009/05/12 clear training data (1000 samples, 2 dimensions, can be seen as 1000 people, each people have 2 variable: weight and age) data = randn(1000,2) 1000 number (x,y) 2d label