A joint backscatter and VLC-NOMA communication scheme for B5G/6G umMTC system Dayu Shi, Xun Zhang, Lina Shi January 2021 Cite Next Spectral and Energy Efficiency of DCO-OFDM in Visible Light Communication Systems with Finite-Alphabet Inputs Previous Environment-aware RSSI based positioning algorithm for random angle interference cancellation in visible light positioning system