3 Fourier Series Representation of Periodic Signals 3.3.2 Determination of the Fourier series Representation of a Continuous-time periodic Signal koot dk(t)=e2x)y,k=0,±1,+2 Orthogonal function set Determining the coefficient by orthogonality Multiply two sides by e jnogt x()em=∑ake(k-n)o3 Fourier Series Representation of Periodic Signals k (t) = e j k(2 /T )t , k = 0,1,2 3.3.2 Determination of the Fourier Series Representation of a Continuous-time Periodic Signal  + =− = k j k t x t ak e 0 ( )  ( Orthogonal function set ) Determining the coefficient by orthogonality: ( Multiply two sides by )  + =− − − = k j k n t k j n t x t e a e 0 0 ( ) ( )   jn t e − 0