Introduction Signals with random parameter are random singals i All noise that can not be predictable are called random noise or noise Random signals and noise are called random process i Random process(stochastic process) is an indexed set of function of some parameter( usually time) that has certain statistical properties. a random process may be described by an indexed set of random variables. a random variable maps events into constants, whereas a random process maps events into functions of the parameter t.3 Introduction • Signals with random parameter are random singals ; • All noise that can not be predictable are called random noise or noise ; • Random signals and noise are called random process ; • Random process (stochastic process) is an indexed set of function of some parameter( usually time) that has certain statistical properties. • A random process may be described by an indexed set of random variables. • A random variable maps events into constants, whereas a random process maps events into functions of the parameter t