OFDM通信系统与QPSK系统性能比较(13)

qpskflection=qpskflection.^qpskin;%0--1;1---1 qpskflection(2,:)=j*qpskflection(2,:); qpskout=sum(qpskflection);

%+++++++++++++++++++++++++++++++++++++++

%++++++++++++++++扩展++++++++++++++++++ ifftin=zeros(1,N); ifftout=zeros(1,N);

for k=1:N %将输入的N/2点扩展为共轭对称的N点 if (33>k>=1) if(k==1)

ifftin(1)=qpskflection(1,1); else

ifftin(k)=qpskout(k); end else

if(k==33)

ifftin(k)=(-1)*j*qpskflection(2,1); else

ifftin(k)=conj(qpskout(N+2-k)); end end end

%+++++++++++++++++++++++++++++++++++++

%+++++++++++++++++IFFT+++++++++++++++++ ifftout=ifft(N*ifftin);

%+++++++++++++++++++++++++++++++++++++++