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Creators/Authors contains: "Lang, Tian"

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  1. ; ; ; ; ; ; (, IEEE International Conference on Consumer Electronics (ICCE) 2021)
    null (Ed.)
    Future healthcare systems require smart hospitals with system-wide wireless communications and positioning functions, which cannot be facilitated by existing radio-frequency (RF) wireless technologies. In this paper, we present integrated design of a novel low-complexity received signal strength (RSS) based hybrid visible light communication (VLC) and indoor positioning (VLP) system. This VLC/VLP tracking system consist of host optical transceivers embedded in existing light-emitting diode (LED) bulbs and user-end optical tags, which interface with the existing 120AVC power wiring in a building. The new hybrid VLC/PLC tracking system was validated by simulation and experimentation. This LED VLC tracking system will enable smart hospital operations to modernize next-generation intelligent healthcare systems 
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  2. ; ; ; ; (, Proc. IEEE Global Communications Conference (GLOBECOM))
    null (Ed.)
    In this paper, we present an in-depth study of light emitting diode (LED) based indoor visible light communication positioning system using a smart phone camera with rolling shutter effect, aiming for smart and connected hospital applications. The LED transmits periodical signals with different frequencies as its optical tags. The camera exploits the rolling shutter effect to detect the fundamental frequency of optical signals. The roles of camera parameters determining the rolling effect are studied and a technique to measure the camera readout time per column is presented. Factors limiting the detectable optical frequency range is explained based on the discussion of rolling shutter mechanism. The Fourier spectrum based frequency resolution, which determines the tracking capacity, is analyzed. 
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  3. ; ; ; ; ; ; ; (, Journal of Communications)
    null (Ed.)
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