www.gusucode.com > 认知无线电频谱检测技术的研究,有循环检测,周期性检测源码程序 > 程序/nengliang.m
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%生成调制信号 fs=100; %采样频率 fc=40; %载频 fo=fs/20; %码率 L=300; %信号样本 t = (0:L-1)*1/fs; xn=cos(8*pi*fc*t); y = xn + randn(size(t)); figure(1) plot(t,y) %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%进行能量检测 NFFT = 2^nextpow2(L); Y = fft(y,NFFT)/L; f = fs/2*linspace(0,1,NFFT/2); figure(2) plot(f,2*abs(Y(1:NFFT/2)))