% ch_multipath.m
% ch_multipath
copy1=zeros(size(recv));
for i=1+d1:length(recv)
copy1(i)=a1*recv(i-d1);
end
copy2=zeros(size(recv));
for i=1+d2:length(recv)
copy2(i)=a2*recv(i-d2);
end
recv=recv+copy1+copy2;