Self Contained Adaptable Optical Wireless Communications System for Stroke Rate During Swimming
Author(s)
Hagem, Rabee M
O'Keefe, Steven G
Fickenscher, Thomas
Thiel, David Victor
Year published
2013
Metadata
Show full item recordAbstract
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 ...
View more >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.
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View more >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.
View less >
Journal Title
IEEE Sensors Journal
Volume
13
Issue
8
Subject
Atomic, molecular and optical physics
Mechanical engineering
Optical fibre communication systems and technologies
Engineering