Contents

% Barker code and matched filter receiver
% s3s3_3.m * mw * 07/23/2007

Barker code length 11 and matched filter impulse response b[11-n]

b = [1,1,1,-1,-1,-1,1,-1,-1,1,-1];
h = fliplr(b);
x = b + 1*randn(1,length(b)); % noisy signal

Matched filter

y = conv(h,x); % output signal

Graphics

figure('Name',['Barker code with length N = ',num2str(length(b))],'NumberTitle','off');
subplot(1,2,1); stem(0:length(x)-1,x,'filled'); grid % matched-filter impulse response
    axis([0,length(x)-1,-5,5]); xlabel('n \rightarrow'); ylabel('x[n],b[n] \rightarrow')
    hold on; stem(0:length(b)-1,b); hold off
subplot(1,2,2); stem(0:length(y)-1,y,'filled'); grid % matched filter output signal
    axis([0,length(y)-1,-5,20])
    xlabel('n \rightarrow'); ylabel('y[n] \rightarrow')

Published with MATLAB® 7.3