Analysis of Noises in the Digital Communication System Considering Gaussian as well as Non Gaussian Noise

Digital communication performances are affected by noise. Amplitude Probability Distribution (APD) has been proposed within C.I.S.P.R. for characterization of the impulsive noise emitted from electrical equipment. The noise which is of impulsive nature is known to affect digital communication performances. The characteristics of noise and the bit error probability are both correlated to each other for estimation of digital communication performances. A unique noise APD pattern is obtained from each measurement of noise emission from different electrical appliances. It is important to have correct measurement set up which utilizes a programmable digitizer with analysis software to evaluate signal power level sampling rate, sample points and filter characterization in order to acquire accurate representation of the noise patterns. The APD pattern is generated by the analyzer which employs the envelope sampling technique from actual probability. The noise PDF is useful for noise modeling and simulation. The degradation on digital communication performance in terms of bit error probability can be estimated by noise PDF. Keyword: Noise, Gaussian, APD etc.