Experimental Demonstration of SDN-Controlled OFDM VLC System Based on Adaptive Multi-User Bit and Power Loading Algorithm

In this paper, we experimentally demonstrate a multi-user OFDM visible light communication system supporting software-defined-network (SDN) configuration to realize flexible resource allocation and bit/power loading for multiple users. An access point is designed based on FPGA to realize real-time generation of the OFDM signal and to interact with the SDN. Multi-user OFDM bit and power loading algorithm is implemented and configured by SDN to the real-time transmitter to flexibly allocate resources according to the demand of users and channel information. Two-user experiments with 30Mbit/s throughput show that the SDN-controlled system works properly and the bit error rate is kept below 10
⁻³
as the receiving angle and the data rate ratio between users change.