transmitter.m

In 揚erformance of multi-carrier DS CDMA Systems?we apply a multi-carrier signaling technique to a di

function [mc_cdma] = transmitter(data,t,Nsample,Nc,pn,M,fc,Nusers)
% ----------------------------------------------------------------------- %
Nf = 31;
alpha = 0.5; 
T = 1; 
Tc = (T/Nc);
Fs = Nsample/Tc;
for no=1:Nusers
   repeated_data(no,:) = kron(data(no),ones(1,Nc));
	dsss(no,:) = repeated_data(no,:).*pn(no,:);   
	[ht] = Fil_ter(Nf,Tc,alpha,Fs,0); 
    sampled_dsss(no,:) = kron(dsss(no,:),ones(1,Nsample));
    a(no,:) = conv(sampled_dsss(no,:),ht);    
    filter_output(no,:) = a(1+(Nf-1)/2:length(a)-(Nf-1)/2);
    for d = 1:M, 
        mod(d,:) = sqrt(2)*filter_output(no,:).*cos(2*pi*fc(d)*t); 
    end; 
   %transmitted_signal
   trans(no,:) = sum(mod,1);
end;
mc_cdma = sum(trans,1);
% ----------------------------------------------------------------------- %