Ambient light noise filtering technique for multimedia high speed transmission system in MIMO-VLC

In this paper, we analyze the degradation of system performance due to the variation of ambient illumination in MIMO-VLC environment for high-speed multimedia transmission and propose an adaptive filter technique to solve this problem. Conventional PD-based visible light communication systems are not suitable for multimedia high-speed transmission. It is vulnerable to optical interference in the presence of a large number of LEDs, and it is difficult to implement MIMO. For large-capacity high-speed transmission, it is necessary to increase the transmission capacity. MIMO-VLC using m * m LED matrix and image sensor enables high-speed transmission through data parallel transmission. However, the received power is greatly influenced by the surrounding light source environment and the receiving distance. Illumination changes caused by non-scattered lights in the indoor environment, which deteriorates the performance of the system. In order to solve this problem, adaptive filter coefficients according to the ambient illuminance are applied to improve on / off recognition rate of LED matrix. By using this technique to adjust the filter values for image processing according to the step-by-step illumination, the multi-LED pixel can be accurately recognized and the MISO-VLC QoS can be maintained.