Spectral and energy efficiency of ACO-OFDM in visible light communication systems Shuai Ma, Ruixin Yang, Xiong Deng, Xintong Ling, Xun Zhang, Fuhui Zhou, Shiyin Li, Derrick Wing Kwan Ng January 2021 Cite Next Software Defined Radio & MIMO Signal Processing Previous Study of RSS-based indoor positioning system for target using visible light communication