NDLI: Self Contained Adaptable Optical Wireless Communications System for Stroke Rate During Swimming

Content Provider	IEEE Xplore Digital Library
Author	Hagem, R.M. O'Keefe, S.G. Fickenscher, T. Thiel, D.V.
Copyright Year	2001
Abstract	The velocity of a swimmer can be determined from the stroke rate and the stroke length or by integrating the forward acceleration. In competitive swimming, these parameters are very important for race planning. This paper presents a wrist mounted accelerometer and optical wireless communications to display goggles to give real time feedback to a swimmer during swimming. The system data rate is 2.4 kbps ON-OFF keying modulation for the optical wireless signal. The system uses visible light communication in the green-blue wavelength. Design challenges include interference from bubbles and strong background light. The final device is low cost with low power consumption and small size. Intra-stroke transmit times are scheduled using the acceleration sensor data. Experiments are conducted in air and under water for this system to optimize the link availability. Algorithms for finding the absolute maximum of the y-axis acceleration for each stroke cycle and the goggles display decision are implemented at the transmitter and the receiver, respectively. Hardware, software, and implementation modifications to improve the system are successfully tested.
Sponsorship	IEEE Sensors Council
Starting Page	3144
Ending Page	3151
Page Count	8
File Size	1202596
File Format	PDF
ISSN	1530437X
Volume Number	13
Issue Number	8
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-08-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	accelerometer Underwater optical wireless communication real time swimmers feedback visible light communication stroke rate
Content Type	Text
Resource Type	Article
Subject	Instrumentation Electrical and Electronic Engineering

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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