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% File: autocorrelation.m 
% ------------------------------------ 
% This function calculate the autocorrelation of x(n) 
 
function[autocorrelation] = autocorrelation(m, signalvector_x); 
% L: Sample length 
% m: Timeshift interval 
% signalvector_x: Input sequence 
L = length(signalvector_x); 
autocorrelation = 0; 
for i = 1: L - abs(m) 
    autocorrelation = signalvector_x(i) * signalvector_x(i + abs(m)) + autocorrelation; 
end 
autocorrelation = autocorrelation / (L - abs(m));