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A US-funded initiative on smart lighting aims to provide wireless broadband capabilities to future LED lighting devices to provide more broadband access points.
For $18.5 million, the National Science Foundation, which lasted for ten years, has researchers from more than 30 universities from Boston University, Rensselaer Polytechnic Institute in New York, and the University of New Mexico (Albuquerque).
The initiative aims to use visible light beams for communication between wireless devices and LED-based lighting devices. This LED-based solution can also be used for communication between cars that are increasingly popular with LED lighting. The overall goal is to create new communication functions for all LED lights to mitigate the current crowded PF band.
Infrared communication of this type has been around for a long time, and there is an infrared data association called IRDA, which has spent many years discussing things like handheld computers, printers and laptops. Thomas University professor Thomas Little said: What we are doing now is to find the opportunity for the revolutionary networking of LED lighting. Incandescent and fluorescent bulbs are being replaced, and we hope to add networking technology to LED lights.
The light-based communication function is now using infrared LED lights, such as remote control, which will be replaced with visible light. In this way, the receiver in the digital device can communicate with the lighting device. The lighting equipment will be fixed to the Inter network. Unlike PF-based Wi-Fi access points that take up spectrum, visible line-of-sight communication can input different data streams into individual devices.
Researchers have tried several debugging schemes, including encoders with standard binary encoding, non-return-to-zero encoders, pulse code modulation, and pulse density modulation. They claim that as long as the data transmission rate is higher than 900 kHz, each solution can guarantee the stability of the light.
The initial prototype, which will be demonstrated next year at a speed of 1-10 Mbits per second, will use existing LEDs and photodiodes to handle the transmission and reception functions. The researchers also plan to develop new semiconductor technologies that will eventually establish visible light transmission and reception.
Little said: When some systems need a receiver, they are usually a photodiode. Here we have an idea to reverse bias with the same LED (actually this is only part of the production process) so that some of the LEDs receive signals and some transmit signals.
This group will also attempt to encode multiple data streams with light waves of various lengths that combine different colors of light into white LEDs. The polarization of light is also a concern for the multi-communication strategy of using visible light.
Boston University will focus on issues related to the rain system, including the development of computer network applications. The semiconductor development will be led by researchers at Rensselaer Polytechnic Institute in New York and the University of New Mexico.
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