Outage performance of opportunistic AF OFDM relaying over Rician fading channel

Abstract

This paper analyzes closed-form outage probability of opportunistic amplify-and-forward (AF) for orthogonal frequency division multiplexing (OFDM) relaying over Rician fading environment. The opportunistic relay node is selected by maximizing signal-to-noise ratio (SNR) over all the relay nodes. In this paper, we propose a method by which a closed form outage probability approximation for opportunistic AF OFDM relaying can be evaluated by utilizing the approximation of Marcum Q-function. The outage probability is derived over independent and identically distributed (i.i.d) fading channel and independent but not identically distributed (i.n.d) fading channel. The investigation indicates that the number of relay nodes has to be increased in order to improve the outage performance of opportunistic AF OFDM relaying irrespective of the number of subcarriers used by the transceivers. We derive a closed-form outage probability approximation over Rician fading channels at high SNR regime and it is validated through the Monte-Carlo simulation results.