DSP

【整理】用IDFT实现UF-OFDM和OFDM的模拟调制

2019-07-13 15:25发布

cooperate with Liu Lei用IDFT实现OFDM的代码如下:N=32; x=randint(1,N,[0 3]); x1=qammod(x,4); f=1:N; t=0:0.001:1-0.001; w=2*pi*f.'*t; % w1=2*pi*(f+0.2).'*t; y1=x1*exp(j*w);%子载波调制 x2=ifft(x1,N); %ifft figure(1); plot(t,abs(y1)); hold on; stem(0:1/N:1-1/N,abs(x2)*N,'-r'); legend('模拟调制实现','IDFT实现'); title('OFDM的模拟调制实现与IDFT实现'); hold off;用IDFT实现UF-OFDM的代码如下:
N=32; x=randint(1,N,[0 3]); x1=qammod(x,4); f=1:N; t=0:0.001:1-0.001; w=2*pi*f.'*t; y1=x1*exp(j*w);%子载波调制 y1=fft(y1); fpass = 0; fstop = 10; [f1,y1] = IdealFilter(length(t),10,fpass,fstop,y1); % 进行理想带通滤波 y1=ifft(y1); x2=ifft(x1,N); %ifft figure(1); plot(t,abs(y1)); hold on; stem(0:1/N:1-1/N,abs(x2)*N,'-r'); legend('模拟调制实现','IDFT实现'); title('UF-OFDM的模拟调制实现与IDFT实现'); hold off;