研究目的
Investigating the performance of a novel digital signal processing (DSP) scheme for special-shaped circular (7,1) modulated signals based on quasi blind carrier phase estimation (QBCPE) in high-speed visible light communication.
研究成果
The QBCPE algorithm demonstrates similar performance to LMS with 3% training sequence but with significantly less overhead (0.33‰), making it a quasi-blind method. This advancement enhances the feasibility of circular (7,1) modulation in high-speed VLC systems.
研究不足
The study focuses on a specific modulation format (circular (7,1)) and its performance in a controlled environment. The applicability to other modulation formats or more dynamic environments is not explored.
1：Experimental Design and Method Selection:
The study proposes a quasi blind carrier phase estimation (QBCPE) algorithm designed for special-shaped circular (7,1) constellation. The methodology includes signal generation, data transmission, and offline DSP processes.
2：Sample Selection and Data Sources:
The experiment utilizes a commercial LED (LZ4-00MA00) and a PIN photodiode (Hamamatsu 10784) for signal transmission and detection.
3：List of Experimental Equipment and Materials:
Equipment includes a self-designed bridged-T based hardware circuit, Bias Tee (ZX85-12G-S), RGB-LED (LZ4-00MA00), and lenses for light concentration.
4：Experimental Procedures and Operational Workflow:
The signal is pre-equalized, coupled with direct current, modulated onto an LED, transmitted through free space, detected by a PIN photodiode, and processed offline.
5：Data Analysis Methods:
The performance is evaluated based on BER and Q-factor measurements, comparing QBCPE with LMS algorithms.
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