qpsk.m

AOFDM系统matlab仿真程序

%Program 3-9
%qpskmod.m
%Function to perform QPSK modulation
%
%Programmed by lpch
%
function [iout,qout]=qpskmod(paradata,para,nd,ml);
%********************* variables **************************************
%paradata :input data(para-by-nd matrix)
%iout:output Ich data
%qout:output Qch data
%para:Number of parallel channels
%nd:Number of data
%ml:Number of modulation levels
%(QPSK -2 16QAM -4)
%*********************************************************************
m2=ml./2;
paradata2=paradata.*2-1;
count2=0;
for jj=1:nd;
    isi=zeros(para,1);
    isq=zeros(para,1);
    
    for ii=1:m2
        isi=isi+2.^(m2-ii)...
            .*paradata2((1:para),ii+count2);
        isq=isq+2.^(m2-ii)...
            .*paradata2((1:para),m2+ii+count2);
    end
    
    iout((1:para),jj)=isi;
    qout((1:para),jj)=isq;
    
    count2=count2+ml;
end
%************************* end of file *********************************