Add location in lighting LED lights search function for indoor equipment and provide network communication, it is important that the black is developed by Disney personnel involved in the research and development of science and technology...
Disney international development agency (Disney Research) and the federal institute of technology (ETH Zurich) in Zurich researchers add the location in the lighting LED lights for function, make it not only can be used for indoor lighting, but also to provide indoor communication links.
The researchers have developed EnLighting system based on consumer LED, and adjust its glow and light sensor function. By alternating let each individual leds adjust light signal and send it as a signal receiver, thus creating can send messages to each other and the light bulb connected to equipment online, and will not affect the indoor lighting.
ETH Zurich PhD Stefan Schmid with other researchers recently held in London in the IEEE sensors, communications and network (SECON) international conference to share their research achievements and details.
"Visible optical communication network in the radio spectrum at the same time, also make it difficult to be network beyond visual range (LoS) anyone eavesdropping," Disney Research vice President Markus Gross said.
VLC system based on intelligent LED bulb concept map: within visual range of LED lights can communication with each other (source: Disney Research)
Researchers used Qualcomm, Qualcomm Atheros wi-fi chip 3991 renovation this LED bulbs, and execute the embedded Linux version. Using simple key point (ON - OFF Keying; baton) modulation of the pulse width modulation (PWM) is used to instantiate the layer (PHY) symbol, and through the Atmel ATmega328p micro controller for the modulation.
Researchers for its verification feasible system deployed four such bulbs. They found that the system architecture and protocol so that the light bulb can make low bandwidth applications technical assistance (usually a IoT devices) the stability of the network. Researchers and show that the system can be used to estimate the location of the equipment in the indoor.
Besides can communicate between bulb, its features are not only is the key to support a wide range of IP range, at the same time can also be used for a series of application scenarios. Because can synchronize between adjacent bulb, reduced the number of data of conflict, makes the connection more stable.
The system also can be dynamically allocated bulb letter values, closed or replace one of the light bulb, or to the specified location. In addition, compared with the bluetooth beacon, mix radio frequency (RF) or optical system, the new system when positioning the light bulb is expected to take low computation load.
