研究目的
Investigating the mitigation of multipath distortion in LED-based indoor positioning systems using an ellipse-based ACO-OFDM algorithm combined with RSS and Trust-region techniques for high accuracy positioning.
研究成果
The proposed EA-OFDM based indoor positioning system effectively mitigates multipath distortion, achieving higher accuracy than ACO-OFDM based systems. The Trust-region technique enables high precision 3D positioning with RMS errors of 0.19 m overall, 0.09 m for horizontal, and 0.16 m for vertical components. Optimal system parameters enhance performance, demonstrating the algorithm's potential for indoor location-based services.
研究不足
The study acknowledges potential initial deviations in 3D positioning estimates and the influence of multipath reflections, especially in corners. The performance is also dependent on system parameters like the ratio a/b, subcarrier number, modulation order, and SNR.
1：Experimental Design and Method Selection:
The study proposes an indoor visible light positioning algorithm combined with ellipse-based ACO-OFDM to mitigate multipath distortion. The real-valued output of OFDM is modulated onto an ellipse, transmitting only the imaginary value from the complex point on the ellipse. RSS technique is used for location determination, and the Trust-region technique is employed for 3D positioning.
2：Sample Selection and Data Sources:
The system uses four LED bulbs as transmitters installed on the ceiling of a room with dimensions of 6 m × 6 m × 4.2 m. Each bulb has a unique ID code for location distinction.
3：2 m. Each bulb has a unique ID code for location distinction.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: LED bulbs, photodiodes as receivers, and a room model for simulation.
4：Experimental Procedures and Operational Workflow:
The input bits including LED ID are mapped using M-QAM to generate complex data symbols modulating odd subcarriers. The output is modulated onto an ellipse, and only the imaginary part is transmitted after clipping negative parts. At the receiver, inverse operations are performed to recover the sequence for decoding LED ID and positioning.
5：Data Analysis Methods:
The performance is evaluated by RMS positioning error and maximum error, comparing EA-OFDM and ACO-OFDM based systems under different parameters.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
