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Resilient non-line-of-sight optical camera communication using byte-level RaptorQ and normalized variance ratio.

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    This study introduces a resilient optical camera communication (OCC) system using RaptorQ coding and a novel Normalized Variance Ratio (NVR) metric for non-line-of-sight (NLOS) data transmission. The system enhances throughput and reliability, overcoming data loss challenges in optical wireless communication.

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    Area of Science:

    • Optical Wireless Communication
    • Information Theory
    • Signal Processing

    Background:

    • Non-line-of-sight (NLOS) optical camera communication (OCC) faces challenges with data loss and spatial division multiplexing (SDM).
    • Existing OCC systems struggle with reliability and efficient data stream separation in complex lighting conditions.

    Purpose of the Study:

    • To develop a resilient NLOS OCC system that mitigates stochastic data loss.
    • To enable effective spatial division multiplexing (SDM) in NLOS OCC environments.
    • To improve data throughput and reliability in optical wireless communication.

    Main Methods:

    • Implementation of a unified byte-level RaptorQ coding scheme for data reconstruction.
    • Introduction of the Normalized Variance Ratio (NVR) statistical metric for adaptive NLOS SDM.
    • Experimental validation of the NVR-enabled NLOS SDM system with a 2-LED setup.

    Main Results:

    • RaptorQ coding increased throughput by 49% at a data reception ratio (DRR) of 0.82 with a 4-byte payload.
    • The NVR metric successfully enabled adaptive NLOS SDM by distinguishing superimposed light patterns.
    • The system achieved 4.4 kbps throughput at 0.8m with a bit error rate (BER) below 10-5.

    Conclusions:

    • The proposed RaptorQ coding and NVR metric significantly enhance the resilience and throughput of NLOS OCC systems.
    • The NVR-enabled NLOS SDM demonstrates superior reliability compared to existing OCC solutions like ReflexCode.
    • This system shows strong potential for practical applications requiring robust optical wireless communication.