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% Program 5-2 
% crosscorr.m 
% 
% Crosscorrelation function of a sequence 
% 
% Programmed by M.Okita and H.Harada 
% 
 
function [out] = crosscorr(indata1, indata2, tn) 
 
% ************************************************************* 
% indata1 : input sequence1 
% indata2 : input sequence2 
% tn      : number of period 
% out     : crosscorrelation data 
% ************************************************************* 
 
if nargin < 3 
    tn = 1; 
end 
 
ln  = length(indata1); 
out = zeros(1,ln*tn); 
 
for ii=0:ln*tn-1 
    out(ii+1) = sum(indata1.*shift(indata2,ii,0)); 
end 
 
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