For the minimization of the energy in the error signal there are different approaches like, Prony's method, Pade approximation. As g(n) has three samples. Consider them as g(−1),g(0),g(1) we can minimise E(h,g) by making h(n)=g(n) using rectangular window and Parseval's there of OTFT. Based on which 10g(−1)+g(1)=10(−3)+3 −27