autocorr.m

一些基于CDMA的编码程序

% Program CDMA-1
%
% autocorr.m
%
% Autocorrelation function of a sequence
%

function [out] = autocorr(indata, tn)

% ------------------------------------------------------------

% indata : input sequence
% tn     : number of period
% out    : autocorrelation data

% ------------------------------------------------------------

if nargin < 2
    tn = 1;
end

ln    = length(indata);
out   = zeros(1,ln*tn);;

for ii = 0:ln*tn-1
    out(ii+1) = sum(indata.*shift(indata,ii,0));
end

% ----------------------- end of file ------------------------