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  • 2010-04-14 22:44
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Chaine de transmission OFDM
ofdm1.rar
  • ofdm1.m
    1.2KB
内容介绍
function y=ofdm1() clear all m=4; nlg=64; ncl=256; lp=4; L=16384; %%%%%%%%%%%%%%%%%%%%%%%%%%%%% EMISSION %%%%%%%%%%%%%%%%%%%%%%%%%%%% e=randint(L,1,m); %génération du signal aléatoire z=qammod(e,m);% modulation m-psk ss=reshape(z,nlg,ncl);%conversion série parallèle symbole=zeros(0); s=ifft(ss); %%%%%%%%%%ajout de préfixe %%%%%%%%%%% for ii=1:ncl symbole=[symbole;s(61:nlg,ii);s(:,ii)]; end %%%%%% filtrage et quantification %%%%%%%%%%%%% ofdmm=reshape(symbole,1,[]);%conversion parallèle série r=[1 zeros(1,49)]; r1=kron(ofdmm,r); filtre=rcosine(1,50,'default',0.3); [non,maxpos]=max(filtre); r3=conv(filtre,r1); r4=r3(maxpos:(maxpos+length(r1)-1)); %%%% suppression de prefixe %%%%%%%%% SNR=[1:10]; for i=1:10 s1=awgn(r4,SNR(i)); signal=s1(1:50:length(r1)); sr=zeros(0); is=reshape(signal,nlg+lp,ncl); for j=1:ncl sr=[sr;fft(is(lp+1:nlg+lp,j))]; end d=qamdemod(sr,m); %démodulation m-psk k=64; tau=0; for k=1:L if(e(k)~=d(k)) tau=tau+1; end end ber(i)=tau/(2*L); end semilogy(SNR,ber,'+r')
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