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UID:462@lincs.fr
DTSTART;TZID=Europe/Paris:20190710T140000
DTEND;TZID=Europe/Paris:20190710T150000
DTSTAMP:20190712T070440Z
URL:https://www.lincs.fr/events/talk-by-ho-sui-wai/
SUMMARY:Channel Estimation in Visible Light Communications
DESCRIPTION:\nIn visible light communications (VLC)\, LEDs are used for not
 only illumination but also communications. LEDs can further be used to
 support indoor positioning with high accuracy. Together with advantages
 such as high data rates\, free from radio frequency interference and energy
 efficiency\, VLC would be crucial for Internet-of-Things (IoT) applications
 as diverse as autonomous vehicles\, robotics &amp\; sensing and smart home
 &amp\; office. In the first part of this talk\, a brief overview of our
 visible light positioning systems for IoT applications will be
 given.\n\n\n\nIt is essential to obtain accurate estimates of the channel
 gains between receiver and multiple light sources in VLC networks. When
 there are multiple transmitters\, time-division multiple access (TDMA) is
 typically used in the channel estimation phase of radio frequency systems.
 However\, the estimation performance of TDMA-based schemes in VLC networks
 is substantially impacted by the maximum power constraint and desired
 average power constraint that are unique to visible light systems. Under
 these constraints\, this talk shows&nbsp\;a fundamental lower bound on the
 total noise variance at the receiver. The necessary and sufficient
 conditions for the bound to hold with equality are derived. This talk also
 illustrates a one-to-one correspondence between a balanced incomplete block
 design and an optimal pilot design with minimal total noise variance.
 Methods for constructing pilot sequences\, which satisfy an arbitrary
 average power constraint\, are shown.\n
CATEGORIES:Seminars,Youtube
LOCATION:Paris-Rennes Room (EIT Digital)\, 23 avenue d'Italie\, 75013
 Paris\, France
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=23 avenue d'Italie\, 75013
 Paris\, France;X-APPLE-RADIUS=100;X-TITLE=Paris-Rennes Room (EIT
 Digital):geo:0,0
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TZID:Europe/Paris
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DTSTART:20190331T030000
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