Aggregate Signal Interference of Downlink LiFi Networks

Light-fidelity (LiFi) extends visible light communication into high-speed and multiuser wireless networks. As in cellular networks, co-channel interference (CCI) stemming from other access points (APs) sharing the same transmission resources is the main limiting factor in the performances of the LiFi networks; therefore, it is important to study characteristics of CCI. This paper studies the statistical characteristics of aggregate signal interference i_agg in downlink LiFi networks where LiFi-enabled APs are randomly deployed following a Poisson point process (PPP). One of the advantages of considering i_agg compared to the aggregate power interference is that parameters of modulation schemes and room dimensions can both be incorporated. The paper's key finding is that the energy of $_agg is not monotonically decreasing as the vertical distance of user of interest and the AP increases. In addition, we show that the distribution of i_agg rapidly approaches a Gaussian distribution as PPP intensity increases.