5.4 (a) Using the Gram-Schmidt orthogonalization procedure, find a set of orthonormal basis functions to represent the three signals s₁(t), $2(t), and s3(t) shown in Figure P5.4. (b) Express each of these signals in terms of the set of basis functions found in part (a). s₁(1) $2(t) 432107234 -2 -3 4321 0 1 2 3 1 2 Sg(1) 13 3 432 101234 -2 72345 -3 TT -5- FIGURE P5.4 1 2 3