Finite-Dimensional lt Discrete-Time Systems In developing the transform-domain representation of the difference equation. it has been tacitly assumed that X(e o) an Y(e/)exist The previous equation can be alternately written as N∑三 (0k e (e0)=∑pk eJ在 X( k=0 Copyright C 2001, S K. MitraCopyright © 2001, S. K. Mitra 4 Finite-Dimensional LTI Discrete-Time Systems • In developing the transform-domain representation of the difference equation, it has been tacitly assumed that and exist • The previous equation can be alternately written as ( ) j Y e ( ) j X e ( ) ( ) 0 0  =  −  = −         =        j M k j k k j N k j k k d e Y e p e X e