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Design and Implementation of a Novel Compatible Encoding Scheme in the Time Domain for Image Sensor Communication
Trang Nguyen1, Mohammad Arif Hossain2, Yeong Min Jang3
1Department of Electronics Engineering, Kookmin University, Seoul 02707, Korea. trang@kookmin.ac.kr.
Sensors (Basel, Switzerland)
|May 24, 2016
Summary
This paper introduces a new On-Off-Keying modulation for optical wireless communication using image sensors. It ensures compatibility with various image sensors, enabling reliable data transmission even with differing camera specifications.
Area of Science:
- Optical Wireless Communication
- Image Sensor Communications
Background:
- Rolling shutter image sensors exhibit diverse frame rates, shutter speeds, and resolutions, posing challenges for standardized communication.
- Existing image sensor limitations include low and variable frame rates, long exposures, and slow shutter speeds, impacting link speed performance.
- The IEEE 802.15.7r1 Task Group (TG7r1) is exploring Optical Wireless Communication (OWC) solutions.
Purpose of the Study:
- To propose a time-domain modulation scheme based on On-Off-Keying for Optical Wireless Communication (OWC) using image sensors as receivers.
- To develop compatible communication supports for diverse image sensor types, addressing their inherent physical limitations.
- To enhance Image Sensor Communications (ISC) by enabling reliable data broadcasting and beaconing.
Main Methods:
- Development of a novel data frame structure supporting both high and low frame rate cameras.
- Implementation of an oversampling mode with majority voting for high frame rate cameras (≥20 fps).
- Utilization of an error detection mode with external code correction for low frame rate cameras (<20 fps).
Main Results:
- A compatible modulation scheme and system architecture for Image Sensor Communications (ISC) are presented.
- The proposed data frame structure effectively supports cameras with varying frame rates.
- Practical measurements informed the suggested operating frequency range and decoding procedures.
Conclusions:
- The novel modulation scheme and data frame structure enhance the robustness and applicability of Optical Wireless Communication (OWC) with image sensors.
- The proposed methods ensure reliable data transmission across a spectrum of image sensor capabilities, including low frame rate scenarios.
- The system architecture and decoding algorithms provide a viable solution for asynchronous communication prototypes in OWC.
Keywords:
IEEE 802.15.7r1LED-to-rolling shutter cameraTG7r1asynchronous communicationerror detectionframe rate variationhigh-speed linkimage sensor communication (ISC)image sensors compatibilitymajority voting schemeoptical wireless communication (OWC)oversampling modeundersampling modeunidirectional mode
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