Fig. 2
From: ELIoT: enhancing LiFi for next-generation Internet of things
Indoor system architecture overview comprising LiFi and Wi-Fi: each LiFi access point (AP) has a LiFi central unit (CU) that performs the baseband (BB) PHY and MAC layers and connects to multiple distributed units (DUs) which are optical front ends (OFEs) in the ceiling. The user terminal is also referred to as mobile unit (MU)