Colored Reconfigurable Photodetectors for Aligning the Light in Vehicular VLC

Vehicular visible light communications have been proposed in the framework of 6G communications to potentially achieve high data rates and extremely low-latency simultaneously. Although multiple-input multiple-output schemes may achieve high data rates they are subject to closed-loop transmission in order to achieve multiplexing gain, also known as degrees of freedom (DoF). In this work, we propose the concept of colored reconfigurable photodetector that generates tuples of colors each providing channel responses linearly independent among them in order to derive a novel transmission scheme referred to as colored blind interference alignment (cBIA). It gets rid of the closed-loop transmission while achieving multiplexing gain, i.e., cBIA achieves both low-latency, depending on the data packet size, and high data rates. The proposed cBIA achieves three times the DoF obtained by traditional non-colored blind interference alignment (BIA). Simulations results show that the achievable rate of cBIA outperforms closed and open loop baseline schemes. Besides, cBIA satisfies the latency requirements of 6G communications.