研究目的
Investigating the use of an element-by-element optical MIMO system with a narrow-window angular filter to achieve interference-free reception of parallel symbol streams in optical wireless communications.
研究成果
The proposed AF-aided element-by-element VLC-MIMO system demonstrates superior performance compared to conventional schemes, with the capacity increasing linearly with the number of transmit and receive elements. The system's low-complexity symbol-by-symbol detection scheme and effective decoupling of parallel symbol streams make it a promising approach for high-rate optical wireless communications.
研究不足
The study assumes accurate acquisition of the channel matrix at the receiver, which may require periodic insertion of pilot symbols. The mechanical alignment between the transmitter and receiver is crucial for optimal performance, potentially adding complexity and cost.
1：Experimental Design and Method Selection:
The study proposes a novel element-by-element optical MIMO system using a narrow-window angular filter (AF) based on a one-dimensional photonic crystal. The AF is designed to pass element-wise paths between the transmitter and the receiver, eliminating undesired interchannel interference (ICI) paths.
2：Sample Selection and Data Sources:
The system model includes a transmitter with Nt transmit LEDs and a receiver with an Nr-element photodetector array. The element spacings at the transmitter and the receiver are dt and dr, respectively.
3：List of Experimental Equipment and Materials:
The AF consists of alternating stacks of TiO2 and SiO2 films. The system parameters include a modulation bandwidth of 40 MHz, a room height of 1.75 m, transmitter semiangle and photodetector FOV of 60°, photodetector area of 1×10?6 m2, and photodetector responsivity of 1 A/W.
4：75 m, transmitter semiangle and photodetector FOV of 60°, photodetector area of 1×10?6 m2, and photodetector responsivity of 1 A/W.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The transmitter sends parallel symbol streams from multiple LEDs, which are received by the photodetector array through the AF. The AF's design ensures that the channel matrix is nearly diagonal and full rank, allowing for interference-free reception.
5：Data Analysis Methods:
The performance is evaluated in terms of the instantaneous channel capacity, comparing the proposed system with conventional VLC-MIMO schemes.
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