Noise in communication systems S(t) Channel r(t)=s(t)+n(t) Noise is additional"unwanted "signal that interferes with the transmitted signal Generated by electronic devices The noise is a random process Each"sample " of n(tis a random variable Typically, the noise process is modeled as"Additive White Gaussian noise”(AWGN) White: Flat frequency spectrur Gaussian noise distributionNoise in communication systems S(t) Channel r(t) = S(t) + n(t) r(t) n(t) • Noise is additional “unwanted ” signal that interferes with the transmitted signal – Generated by electronic devices • The noise is a random process – Each “sample” of n(t) is a random variable • Typically, the noise process is modeled as “Additive White Gaussian Noise” (AWGN) – White: Flat frequency spectrum – Gaussian: noise distribution Eytan Modiano Slide 2