Spectral and energy efficiency of DCO-OFDM in visible light communication systems with finite-alphabet inputs Ruixin Yang, Shuai Ma, Zihan Xu, Hang Li, Xiaodong Liu, Xintong Ling, Xiong Deng, Xun Zhang, Shiyin Li January 2022 Cite Next Proceeding of 2021 International Conference on Wireless Communications, Networking and Applications Previous A joint backscatter and VLC-NOMA communication scheme for B5G/6G umMTC system