echo on
Lc=20; %number of chips per bit
A1=3;  %amplitude of the first sinusoidal interference
A2=7; %amplitude of the second sinusoidal interference
A3=12; %amplitude of the third sinusoidal interference
A4=0;  %fourth case:no interference
w0=1;  % frequency of the sinusoidal interference in radians
SNRindB=0:2:30;
for i=1:length(SNRindB),
    smld_err_prb1(i)=ss(SNRindB(i),Lc,A1,w0);
    smld_err_prb2(i)=ss(SNRindB(i),Lc,A2,w0);
    smld_err_prb3(i)=ss(SNRindB(i),Lc,A3,w0);
    echo off;
end;
echo on;
SNRindB4=0:1:8;
for i=1:length(SNRindB4),
    % measured error rate when there is no interference
    smld_err_prb4(i)=ss(SNRindB4(i),Lc,A4,w0);
    echo off;
end;
echo on;
%plotting commands follow