研究目的
Investigating the performance of the 32-quadrature amplitude modulation (32-QAM) constellation shaping schemes for visible light communication (VLC) systems.
研究成果
The Circular (4, 11, 17) constellation shaping scheme achieves the best BER performance in the VLC system due to its lowest PAPR, demonstrating the importance of considering nonlinearity in constellation design for VLC systems.
研究不足
The study is limited by the nonlinearity of the LED and the constraints of the VLC system, such as the modulation bandwidth and the dynamic range of the transmitted electrical power.
1：Experimental Design and Method Selection:
The study designs two special circular constellations and a triangular constellation based on Shannon’s criterion for 32-QAM in VLC systems. It employs single carrier modulation combined with frequency domain equalization (SC-FDE) to evaluate the performance.
2：Sample Selection and Data Sources:
The experiment uses a commercially available LED and a PD module for transmitting and receiving signals, respectively.
3：List of Experimental Equipment and Materials:
LED (Cree XLamp XP-E), PD module (Hamamatsu C12702-11), arbitrary function generator (Tektronix AFG3252C), and high-speed digital oscilloscope (Tektronix MSO4104).
4：4).
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: Signals are generated offline, uploaded into an AFG, transmitted through the LED, received by the PD, and recorded by an OSC for offline demodulation.
5：Data Analysis Methods:
The performance is evaluated based on bit error rate (BER) and peak-to-average power ratio (PAPR) under different DC offsets and transmitted electrical power.
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