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% Program 3-10 
% qpskdemod.m 
% 
% Function to perform QPSK demodulation 
% 
% programmed by H.Harada 
% 
 
function [demodata]=qpskdemod(idata,qdata,para,nd,ml) 
 
%****************** variables ************************* 
% idata :input Ich data 
% qdata :input Qch data 
% demodata: demodulated data (para-by-nd matrix) 
% para   : Number of paralell channels 
% nd : Number of data 
% ml : Number of modulation levels 
% (QPSK ->2  16QAM -> 4) 
% ***************************************************** 
 
demodata=zeros(para,ml*nd); 
demodata((1:para),(1:ml:ml*nd-1))=idata((1:para),(1:nd))>=0; 
demodata((1:para),(2:ml:ml*nd))=qdata((1:para),(1:nd))>=0; 
 
%******************** end of file ***************************