Synchronous time multiplexing for non-line-of-sight multiple-input multiple-output optical camera communications.
Optics Letters
|May 15, 2024
Summary
This study introduces a novel time-multiplexing modulation scheme for multiple-input multiple-output (MIMO) optical camera communication (OCC) systems. The proposed method enhances data rates and security in non-line-of-sight scenarios.
Area of Science:
- Optical Camera Communication (OCC)
- Wireless Communication Technologies
- Signal Processing
Background:
- Multiple-input multiple-output (MIMO) optical camera communication (OCC) systems often suffer from high spatial correlation, leading to signal interference and reduced performance.
- Interference between optical signals in MIMO OCC systems degrades transmission efficiency and data integrity.
Purpose of the Study:
- To propose a novel time-multiplexing integral modulation scheme for non-line-of-sight (NLOS) MIMO OCC systems.
- To enhance both the data rate and security of MIMO OCC systems through innovative modulation and demodulation techniques.
Main Methods:
- Implementation of a time-multiplexing integral modulation scheme for NLOS MIMO OCC.
- Development of a genetic algorithm (GA)-based adaptive multi-threshold scheme for demodulating blurred fringes in multi-level pulse amplitude modulation (ML-PAM).
Main Results:
- Achieved a data rate of 16.4 kb/s at a distance of 2.5 m.
- Demonstrated a Bit Error Rate (BER) performance of 3.01 × 10-3, confirming the effectiveness of the proposed scheme.
Conclusions:
- The proposed time-multiplexing integral modulation scheme significantly improves performance in MIMO OCC systems.
- The GA-based adaptive multi-threshold scheme reliably demodulates signals, validating the overall superiority and reliability of the proposed techniques.
