DF Relaying Networks With Randomly Distributed Interferers

Xiazhi Lai, Wanxin Zou, Dongqing Xie, Xutao Li, Lisheng Fan

Abstract: In this paper, we study a decode-and-forward (DF) relaying network with random interferers, in which the source transmits its message to the destination with the help of N DF relays. We consider the interference-limited environments, where the reception at the relays and the destination are corrupted by random interferers, which are distributed according to a homogeneous Poisson point process. To improve the system performance, relay selection based on received signal-to-interference ratio (SIR) has been employed to select the best relay among N ones. We examine the network performance by deriving the analytical outage probability under Rayleigh fading transmission channels and Nakagami-m fading interference channels. Moreover, we compute the asymptotic expressions of outage probability, and confirm that the system diversity order on SIR is equal to 2/α, where α denotes the path loss factor. Furthermore, we see that the major limitation of system results from the second hop. Numerical and simulation results are demonstrated to validate the proposed analysis as well.