transmit.m

多径信道下的ofdm仿真系统

function BaseSignal=transmit(codemodu,ifftnum,carriers,guardtime);
%freq to time
parameterinit;
TxSpectrums = zeros(ifftnum,1);
TxSpectrums(carriers) =codemodu;
TxSpectrums(negcarriers)=conj(codemodu);
BaseSignal(:,1)=ifft(TxSpectrums(:,1));
clear TxSpectrums;
%add cyclic prefix
EndSignal = size(BaseSignal,1);	
BaseSignal=[BaseSignal((EndSignal-guardtime+1):EndSignal,:); BaseSignal];
BaseSignal = reshape(BaseSignal,size(BaseSignal,1)*size(BaseSignal,2),1); %并行数据转换为串行数据