100-m field trial for 5G wireless backhaul based on circular (7,1) 8-QAM modulated outdoor visible light communication

Visible light communication (VLC) offers a power-efficient, clean alternative to RF technology, which is feasible for future 5G wireless backhaul. We experimentally demonstrate an outdoor WDM-VLC system employing circular (7,1) modulation. An aggregate capacity of 1.74Gb/s is successfully achieved over 100-m outdoor free space transmission.