Communication Range Expansion via Superimposed Iterative and Parallel Delay Transmission in Rolling Shutter Based Visible Light Communication

This study aims to enhance flexibility in the communication range of rolling shutter based visible light communication (RS-VLC). One of the main challenges in RS-VLC is the trade-off between the data rate and communication distance. To address this issue, we proposed a method that integrates superimposed iterative transmission with parallel delay transmission. Superimposed iterative transmission overlays two datasets, one optimized for short-range communication and the other for long-range. This strategy enhances communication over longer distances without significantly reducing the data rate at shorter ranges. Meanwhile, the parallel delay transmission sends signals with varying delays simultaneously across multiple LEDs, facilitating efficient transmission. By combining these two techniques, we aim to extend the communication range. Experimental results illustrate that the proposed approach enables data reception at long distances (up to 270cm) while significantly reducing data rate degradation at shorter distances. This effectively mitigates the trade-off between data rate and communication range. Additionally, over communication distances of 50 to 290cm, the average throughput of our method improved by approximately 73% compared to conventional methods.