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Simultaneously Capturing Real-time Images in Two Emission Channels Using a Dual Camera Emission Splitting System: Applications to Cell Adhesion

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Spatial division multiplexing of LED strips for optical camera communication.

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Area of Science:

Optical Wireless Communication
Mobile Computing

Background:

Rolling shutter based optical camera communication (RS-OCC) offers unlicensed spectrum and no electromagnetic interference, enabling flexible, low-cost data exchange using smartphone cameras.
Enhancing data throughput in RS-OCC remains a significant challenge for practical applications.

Purpose of the Study:

To propose and experimentally demonstrate a spatial division multiplexing (SDM) technique using LED strips to enhance RS-OCC data throughput.
To investigate and optimize operational parameters of LED strips and smartphone cameras for improved performance.

Main Methods:

Implementation of an LED strip-based spatial division multiplexing (SDM) system.
Optimization of LED strip and smartphone camera operational parameters.
Employment of a 5-tap least mean square-based feedforward equalizer (LMS-FFE).

Main Results:

Achieved a record aggregated data throughput of 201.96 kbit/s.
Successfully demonstrated the feasibility of using eight LED strips modulated with 8-level pulse amplitude modulation (PAM-8) signals.
Validated the effectiveness of the optimized parameters and LMS-FFE in enhancing data rates.

Conclusions:

The proposed LED strip-based SDM technique significantly enhances data throughput for RS-OCC.
This method provides a flexible and efficient data transfer scheme between mobile devices like smartphones.
RS-OCC presents a viable alternative for private information exchange in mobile environments.