2 The signal types with additive noise (1)deterministic signal x(t)=s(t)+v() For example:PAM signal (Pulse Amplitude Modulation st0=A0cosa40=0 within the period T PFM signal (Pulse Frequency Modulation s(t)=Acos()0 J0,1 within the period T Synchronous digital communication (without random phase) UESTC 5UESTC 何子述等 5 2、The signal types with additive noise For example：PAM signal (Pulse Amplitude Modulation ) PFM signal (Pulse Frequency Modulation ) x t s t v t ( ) ( ) ( ) = + 1 ( ) ( )cos( ), ( ) 0 o s t A t t A t   = =   within the period T 1 i i 2 , 1 ( ) cos( ), , 0 s t A t      = =   within the period T Synchronous digital communication (without random phase) (1) deterministic signal