234
11 Applications of LEDs
particular, some specific applications are aircraft, hospitals and other radio frequency
sensitive areas, military bases and other information security areas. The white light
LED-based visible light communication technology does not directly replace the
traditional communication technology, but is a good complement to these wireless
communication technologies.
The United States is at the forefront of research in semiconductor lighting,
but research on semiconductor lighting information networks started late. Boston
University (responsible for LED communications, computer network system technology research), Rensselaer Institute of Technology (responsible for new material
device technology and system applications), and the University of New Mexico
(construction platform for nanomaterials, devices, bioimaging and display) center
have achieved data transmission between two laptop computers by two LED lights
flashlight demonstration system. Boeing is also engaged in research for multimedia
entertainment system on the aircraft’s study and development [2].
Europe has also carried out a lot of research and development work in this field.
The representative research institutions include the University of Oxford, University of Cambridge, Imperial College London, Siemens, France Telecom and so on.
Lubin Zeng from University of Oxford and his colleagues proposed a communication
system based on white-light LED arrays and detectors with data rates of up to 1Gbps
[3]. Researchers at Fraunhofer Institute of Communications in Germany together
with Siemens has realized the data transmission rate of 513 Mbps. The bit error
rate is lower than 2 × 10
−3 [4]. The University of Oxford put forward the method of
improving the data transmission rate by using pre-equalization and post-equalization,
and developed the point-to-point music playback demonstration system (data transmission rate less than 1 Mb/s) and the one-way communication of 2.5 mbit/s with
the transmission distance of 2 m. Siemens realized point-to-point data transmission
with a speed of over 10 Mb/s using white LED. At the beginning of this century,
the Nakagawa research group of Keio University in Japan proposed the concept of
constructing an indoor optical wireless network using illuminated white LEDs, and
made a preliminary theoretical analysis of the parameters and influences of the visible
light communication system [4]. In 2003, Japan established visible light communications Consortium (VLCC). The members include telecommunications, lighting,
LED aspects of manufacturing, power electronics, electronics manufacturing firms.
VLCC not only emphasizes the research and development of advanced technologies,
but also pays great attention to the research work of industry standards. In 2007, two
standards were proposed adopted by the Japan Electronics and Industrial Technology
Association (visible light communication system standard CP-1221 and visible light
ID system standard CP-1222). South Korea is also very active in the research of
semiconductor lighting information networks. Researchers from Samsung and Korea
Electronics and Telecommunications Research Institute have implemented point-topoint communication between mobile devices and wavelength division multiplexing
using RGB tri-color light to achieve one-way communication between fixed facilities and mobile devices as well as two-way communication from fixed facilities to
mobile devices.
11 Applications of LEDs
particular, some specific applications are aircraft, hospitals and other radio frequency
sensitive areas, military bases and other information security areas. The white light
LED-based visible light communication technology does not directly replace the
traditional communication technology, but is a good complement to these wireless
communication technologies.
The United States is at the forefront of research in semiconductor lighting,
but research on semiconductor lighting information networks started late. Boston
University (responsible for LED communications, computer network system technology research), Rensselaer Institute of Technology (responsible for new material
device technology and system applications), and the University of New Mexico
(construction platform for nanomaterials, devices, bioimaging and display) center
have achieved data transmission between two laptop computers by two LED lights
flashlight demonstration system. Boeing is also engaged in research for multimedia
entertainment system on the aircraft’s study and development [2].
Europe has also carried out a lot of research and development work in this field.
The representative research institutions include the University of Oxford, University of Cambridge, Imperial College London, Siemens, France Telecom and so on.
Lubin Zeng from University of Oxford and his colleagues proposed a communication
system based on white-light LED arrays and detectors with data rates of up to 1Gbps
[3]. Researchers at Fraunhofer Institute of Communications in Germany together
with Siemens has realized the data transmission rate of 513 Mbps. The bit error
rate is lower than 2 × 10
−3 [4]. The University of Oxford put forward the method of
improving the data transmission rate by using pre-equalization and post-equalization,
and developed the point-to-point music playback demonstration system (data transmission rate less than 1 Mb/s) and the one-way communication of 2.5 mbit/s with
the transmission distance of 2 m. Siemens realized point-to-point data transmission
with a speed of over 10 Mb/s using white LED. At the beginning of this century,
the Nakagawa research group of Keio University in Japan proposed the concept of
constructing an indoor optical wireless network using illuminated white LEDs, and
made a preliminary theoretical analysis of the parameters and influences of the visible
light communication system [4]. In 2003, Japan established visible light communications Consortium (VLCC). The members include telecommunications, lighting,
LED aspects of manufacturing, power electronics, electronics manufacturing firms.
VLCC not only emphasizes the research and development of advanced technologies,
but also pays great attention to the research work of industry standards. In 2007, two
standards were proposed adopted by the Japan Electronics and Industrial Technology
Association (visible light communication system standard CP-1221 and visible light
ID system standard CP-1222). South Korea is also very active in the research of
semiconductor lighting information networks. Researchers from Samsung and Korea
Electronics and Telecommunications Research Institute have implemented point-topoint communication between mobile devices and wavelength division multiplexing
using RGB tri-color light to achieve one-way communication between fixed facilities and mobile devices as well as two-way communication from fixed facilities to
mobile devices.