研究目的
To allocate users to the optimal subcarriers in visible light communication and evaluate the performance of different allocation algorithms in an experimental setup.
研究成果
The proposed algorithm 1 outperforms other schemes, providing up to 11 users with a deviation smaller than 5% from the target data rate. The performance advantage diminishes with an increasing number of subcarriers, highlighting the algorithm's suitability for scenarios with a low amount of subcarriers.
研究不足
The study is limited by the conditions of large swings in signal-to-noise ratio (SNR) in a VLC channel and the lower amount of total subcarriers that can be allocated compared to fiber-optic communications.
1：Experimental Design and Method Selection
The experiment uses multiband carrierless amplitude and phase (m-CAP) modulation associated with subcarrier multiplexing (SCM) for multi-user access in a visible light communication (VLC) system. The setup includes a commercial white LED downlight as the transmitter and a receiver with a photodetector and transimpedance amplifier.
2：Sample Selection and Data Sources
The experiment involves 1 to 20 users in a VLC system, with data rate targets defined for each user. The performance is measured in terms of deviation from the target data rate.
3：List of Experimental Equipment and Materials
Commercial white LED downlight, 25 mm biconvex lens, photodetector, transimpedance amplifier circuit.
4：Experimental Procedures and Operational Workflow
The distance between transmitter and receiver is set at 2.15 meters with line of sight. The modulation process includes pre-equalization to extend the modulation bandwidth. The allocation of subcarriers to users is stored in the first subcarrier.
5：Data Analysis Methods
Performance is estimated by the deviation from the data rate target for each user, averaged across users. The deviation is measured as the absolute difference between attained and target data rates in percent.
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