Performance Evaluation of Two-Hop Wireless Network under Asymmetric Fading Environment

Abstract

To enhance the reliability of long wireless link, a relay is placed between transmitter and receiver which break the link into two parts: transmitter to relay called 1 st hop and relay to receiver called 2 nd hop; such arrangement is called two hop wireless links. In two-hop wireless communication sometimes 1 st and 2 nd hops are affected by different types of fading called asymmetric fading environment. In this paper we consider four different combinations of Rayleigh and Nakagami-m fading on 1 st and 2 nd hop to observe the profile of combined pdf (probability density function) and cdf (cumulative distribution function). With the help of cdf we determine the variation of outage probability of mixed fading. Finally we plot the SER (symbol error rate) against the SNR (signal to noise ratio) of the 2 nd hop for all possible combinations of the two fading taking the SNR of 1 st hop as a parameter. Although recent literature deals with asymmetric fading environment but in this paper instead of details statistical model of such fading we provide the relative scenario of mixed fading on 2-hop wireless link.