Study of different types of noise and their effects on digital communications

Abstract: During propagation between a transmitter and a receiver, the transmitted signal is often subjected to several phenomena related to the propagation environment. It result during reception, a signal comprised of multiple elementary signals. These elementary signals take different paths and therefore have different propagation times and amplitudes. They thus exhibit phase shifts that may lead to recombination of constructive and destructive ways thus causing a complete disappearance of the signal. The latter phenomenon commonly known as �fading� may affect the performance of mobile communication systems. The fading amplitude of the received signal may follow several statistical distributions such as Rayleigh, Nakagami. In this context, the evaluation of performance of these systems is therefore essential to develop highly efficient systems. As the measures in real environments are very tedious, several methodologies will emulate realistic propagation channels multi paths have been proposed. This in order to characterize the performance of mobile communication systems.

Keywords: fading, noise, channel, Rayleigh, Rice, digital fingerprint.