claudiocamera said:The Z transform is the discrete counterpart to Laplace transform .
Is there Laplace Transform to periodic signals ? Since as well as Laplace transform the Z transform has a ROC region of convergence. So as Laplace transfor has basic transformation to cos (wt) u(t) or sin(wt) u(t) the Z transform has transformation to cos(nt) u or sin(nt) u.