Concatenated Channel Coding with Ring Structure in Screen-Camera Links

This paper presents a novel approach to screen-camera communication, addressing the growing demand for efficient data transmission in visible light communication systems. We introduce Concatenated Channel coding with Ring structure for unequal error protection (CCRCode), a robust coding scheme designed to overcome the challenges of screen-camera links. CCRCode leverages a two-tier error correction strategy: an intra-symbol level using Low Density Parity Check (LDPC) codes for data correctness, and an inter-symbol level employing a unique ring-structured layer-aligned multipriority rateless codes with additional LDPC codes for data integrity and unequal error protection. Our method outperforms existing techniques in handling heterogeneous data with varying importance levels. We develop an optimization model that dynamically adjusts coding parameters based on channel conditions, ensuring optimal performance across diverse scenarios. Extensive experiments demonstrate CCRCode's superior efficacy in terms of recovery rate and utility under various challenging conditions, including different distances, viewing angles, and screen shifts. Notably, CCRCode achieves complete data recovery in half the time required by competing methods.