研究目的
To propose an efficient polar modulation scheme using Constellation Rearrangement (CR) to uniform the Euclidean distance between polar modulated symbols in optical wireless communication MIMO systems, addressing the issue of uneven Euclidean distances that increase error probability.
研究成果
The proposed polar modulation with CR method effectively uniformizes Euclidean distances, leading to improved BER performance and power efficiency compared to general polar modulation, while offering higher BPCU than QCM. It provides a good trade-off in transmission rate and error performance for OWC-MIMO systems, suggesting potential for practical applications with further validation in diverse environments.
研究不足
The study is limited to simulations in an indoor LOS environment; real-world multipath effects and non-LOS conditions are not considered. The use of ZF detection may not be optimal for all scenarios, and the CR method's complexity and scalability to higher modulation orders or larger MIMO systems are not fully explored.
1：Experimental Design and Method Selection:
The study involves designing a polar modulation scheme with CR for OWC-MIMO systems, using computer simulations to compare BER performance, power consumption, and BPCU with existing methods like QCM and general polar modulation. Theoretical models include MIMO channel modeling and ZF detection.
2：Sample Selection and Data Sources:
Simulations are conducted with synthetic data based on defined parameters, including LED and PD locations, modulation orders (e.g., QPSK, 16QAM, 64QAM), and channel conditions in an indoor LOS environment.
3：List of Experimental Equipment and Materials:
LEDs and PDs are used as transmitters and receivers, with specifications such as half-power semi-angle of 60 degrees, FOV of 70 degrees, and responsivity of 1. No specific brands or models are mentioned.
4：No specific brands or models are mentioned.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The process includes generating QAM symbols, applying polar modulation with CR, transmitting through a 4x4 MIMO system with defined channel coefficients, adding AWGN, and using ZF detection at the receiver to compute BER.
5：Data Analysis Methods:
Performance is analyzed through BER curves and average symbol magnitude calculations, with comparisons made between QCM, polar modulation, and the proposed method under different LED power limitations (β=1 and β=4).
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