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In recent years, wireless communications have significantly evolved due to the advanced technology of smartphones;, portable devices; and the rapid growth of Internet of Things, e-Health, and intelligent transportation systems . Moreover, there is anare increasing need fors of emerging intelligent services like positioning and sensing in athe future intelligence society. Recent years have witnessed the growing research interests and activities in the communication and intelligencet services in the optical wireless spectrum, as a complementary technology to more established radio frequency (RF)-based systems, to overcome the spectrum sparsity and increases data rates in crowded locations, due to the limited transmission range and interference. The OWC technology offers advantages such as free license, wide bandwidth, inherent security, no RF electromagnetic interference, and immunity to electromagnetic interference. The attractive applications of the optical spectrum include ultra-violet tactic communication, blue/green underwater communication, visible light positioning, and vehicular communication/sensing in intelligent transportation systems. The present Iissue, as named "Visible Light Communication and Positioning", focuses on visible light communication and visible light positioning, where four papers are on visible light communication and three papers are on visible light positioning. For visible light communication, the published works focus on the devices, the physical-layer techniques, and the system work aspects. Besides VLC, visible light positioning works include fingerprint-based indoor positioning system for multiple reflections, the impact of LED tilt on visible light positioning accuracy, and a mobile optoelectronic tracking system based on feedforward control.

sofware defined optics (SDO) --- n/a --- light to frequency converter --- white-light LED --- error observer --- nature conditions (thermal turbulence --- color independence --- feedforward control --- visible light communication --- adaptive power allocation scheme --- random forest (RF) --- localization algorithm --- generalized color modulation --- wearable device --- positioning --- tracking performance --- software defined radio (SDR) --- VLP --- multistate quadrature amplitude modulation (M-QAM) --- fog) --- rain --- visible light communication (VLC) --- LED tail-light --- optical wireless communication --- LED indoor ceiling light --- multipath reflections --- k-nearest neighbors (kNN) --- bit-error ratio (BER) --- anti-disturbance ability --- vehicle-to-everything (V2X) --- mobile optoelectronic tracking system --- disturbance observer --- model reference --- indoor positioning system (IPS) --- fitting model --- Visible Light Positioning --- LED tilt --- inverse power allocation scheme --- non-orthogonal multiple access --- V2X --- visual MIMO --- color-space-based modulation