Sensing-Aided CSK Constellation Design for Multi-Color VLC System With Random Receiver Orientation

Since the passband of an optical filter will shift as the optical incidence angle changes, random receiver orientation will lead to variation of normalized channel matrix in multi-color visible light communication (VLC) systems. This work investigates the constellation design for color shift keying (CSK) system under random receiver orientation. We consider a multi-color visible light sensing and communication system. Taking the chromaticity and color rendering index constraints into account, we propose two CSK constellation design methods, one to generate constellations for each optical incidence angle and the other to generate constellations with the optical incidence angle regarded as a random variable. Then, taking the sensing information as a prior knowledge, we construct the CSK constellation maps to reduce the real-time computational complexity, and propose a sensing-aided communication mechanism. Moreover, to obtain the sensing information, we propose a 5D user equipment (UE) location and pose estimation method for the considered systems. Simulation results demonstrate the performance gain of the designed CSK constellations, the accuracy of the proposed UE location and pose estimation method, and the potential with CSK constellation map.