Designs of a free-space white-LED mass-storage transceiver for SD-card file transfer

Two visible-light mass-storage prototypes have been constructed. They enable file transfers between the SD (Secure Digital) memory card and the PC via white-LED light. The entire system consists of a pair of identical white-LED transceivers: one is connected to the PC, whereas the other is connected...

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Bibliographic Details
Main Authors: Lih Chieh Png, Nhat Le Minh, Liangquan Chen, Kiat Seng Yeo
Format: Conference Proceeding
Language:English
Subjects:
Clocks
Integrated circuits
Light emitting diodes
Prototypes
Pulse width modulation
Transceivers
Universal Serial Bus
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Summary:Two visible-light mass-storage prototypes have been constructed. They enable file transfers between the SD (Secure Digital) memory card and the PC via white-LED light. The entire system consists of a pair of identical white-LED transceivers: one is connected to the PC, whereas the other is connected to the SD-card subcircuit. File transfer operation is able to execute at 19200 bps. Prototype 1 is based on pulse-position modulation (PPM), while Prototype 2 is based on pulse-width modulation (PWM). It was found that the PPM design consumes less power and is more stable. Full-speed (12 Mbps) USB 2.0 VLC transceiver designs for slave and host devices are also included.
ISSN:2166-0077
2166-0077
DOI:10.1109/GLOCOMW.2012.6477762