Experimental Teaching Design for Integrated Optical Communication Positioning under Spread Spectrum System

While optical wireless communication (OWC) holds significant potential, its practical implementation faces critical challenges, including limited system stability, functional rigidity, and stringent alignment requirements. To address these issues, this paper presents an integrated experimental teaching platform for full-duplex spread spectrum (SS) communication and positioning utilizing light-emitting diode arrays. The proposed system employs optical SS modulation to enhance communication robustness and data throughput, while leveraging the phase characteristics of SS codes to achieve millimeter-level ranging accuracy through dual-terminal signal forwarding. Furthermore, to overcome the performance degradation of SS code recognition and acquisition in low signal-to-noise ratio environments, a novel correlation acquisition algorithm based on weighted Mahalanobis distance is introduced. By shifting the decision metric from conventional correlation peaks to feature distribution analysis, this algorithm significantly improves signal detection probability. Experimental results demonstrate a 40% enhancement in acquisition probability compared to conventional serial correlation methods, thereby reinforcing system reliability and noise immunity under adverse channel conditions.