Performance analysis of digital communication over fading channels
International Journal on Communications Antenna and Propagation
Department of Electronic and Electrical Engineering, Ladoke Akintola University of Technology, Ogbomoso, Nigeria; School of Electrical and Electronic Engineering, Universiti Sains Malaysia, Nibong Tebal, Pulau Pinang, Malaysia
There are several propagation paths between the transmitter and the receiver. The signal components arriving at the receiver from different paths add destructively or constructively any phase shift introduced by the medium. Thus, the signal strengths depend on the relative phases of the components of the received signal giving rise to a condition known as FADING. This paper dwells basically on the characterization, modeling and mitigation of outage probability of a generalized selection combining technique in a Rayleigh fading channel. It involves deriving the probability density function of the combiner output of a generalized selection system by integration, from which the outage probability would then be evaluated in closed form expression. MATLAB tool was used to simulate the behaviour of the received signal with varying number of selected paths: plots of the outage probability against normalized average signal-to noise ratio per symbol per path were obtained which showed an exponentially decaying power delay profile that is an increment in the available diversity paths L with the highest number of strongest paths Lc causing the performance of outage probability of a generalized combiner in Rayleigh fading channel to increase. Thus, it was observed that as the signal propagates through multiple paths, the average signal-to-noise ratio can be improved with the aid of a generalized selection combiner with the highest number of strongest paths. © 2012 Praise Worthy Prize S.r.l.-All rights reserved.