decoder.m

These files in Matlab implement a conventional DS -CDMA detector using QPSK modulation and matched f

%% Reception of the modulated QPSK signal
%% Description


function [user_info_recv ]=decoder(amp_estimate,index);

global Fs Fc Ts Nsamp Tb pn_seqI pn_seqQ  t SG amp_est

%** Note that amp_estimate is in polar form **%

x_recv=amp_estimate;
[walshcode,W]=walsh(64,index);

Z1=repmat(walshcode,1,(length(x_recv)/SG));
x_recv=x_recv.*Z1;        


user_info_recv=intdump(x_recv,SG);
% Z2=reshape(x_recv,SG,(length(x_recv)/SG));
% user_info_recv=sum(Z2,1)/SG;       % The actual user_info decoded