function dlss = ddm_lin_sys_sol(A_sys,b_sys,N_fft,R)
dlss = zeros(ddm_dgr+1, N_fft-R+1);

for l=1:N_fft-R+1
  A = A_sys(:,:,l);
  b = b_sys(:,:,l);
  dlss(:,l)     = [fliplr((inv(A'*A)*A' * b).') 0];
end
end