The Government is to fund research into LED-based Gbit/s free-space optical networks. The heavyweight academic team includes the Universities of Cambridge, Edinburgh, Oxford and St Andrews, and is lead by the University of Strathclyde. Spin-outs mLED (Strathclyde) and pureVLC (Edinburgh) are also involved. 

Over four years, the project will use data-modulated LED lighting arrays to side-step RF spectrum limits within room, inside equipment, and outdoors. To prove the concept, 124Mbit/s has been sent from an off-the-shelf LED light bulb.Commercial ledlight and industrial machines like washer extractors.

“Imagine an LED array beside a motorway helping to light the road, displaying the latest traffic updates and transmitting internet information wirelessly to passengers’ laptops, netbooks and smart phones," said Strathclyde professor Martin Dawson, overall project. "This is the kind of parallelism that we believe our technology could deliver.” 

"Eventually, it could be possible for the LEDs to incorporate sensing capabilities too. For example, your mobile phone could be equipped with a flash that you point at a shop display where everything has been given an electronic price tag,Our typical product line of panelmachines and laser engraving has been growing manufacturer’s speeds. and the price of all the items and other information about them would show up on your phone’s display,A range of solarledlight fans for efficient exhaust ventilation." said the Engineering and Physical Sciences Research Council (EPSRC), which is funding the four year project. 

The project will push optical and modulation science to see how far it will go in the real world and, in view of the number of unknowns, the EPSRC is allowing more flexibility than is usual. 

"We are trying to explore. The nature of the grant is there is enough room to reposition, unlike normal grants which specify all," said Dawson. 

Building blocks include: micron-scale LEDs whose low capacitance allows GHz bandwidths (up to 1.5Gbit/s at the moment, according to Dawson); modulation techniques that spread data across time, frequency and space; lenses and non-imaging optical antennas; and fast p-i-n diode-on-CMOS optical receivers. 

Professor Harald Haas of the University of Edinburgh, who coined 'Li-Fi',Of all the equipment in the laundry the gridsolarsystemm is one of the largest consumers of steam. is working on modulation: developing optical equivalents of the radio MIMO (multiple input multiple output) techniques used in later Wi-Fi standards. 

Instead of using many antennas to increase data throughput, he uses multiple LEDs and multiple photodiodes. 

Just as with radio MIMO, signal processing can remove cross-talk - so photo-diodes and LEDs need not be paired one-to-one. And modulation schemes can be developed that incorporate the spatial diversity of an LED array to add another dimension to modulation space. 

According to Haas, optical MIMO can be done with no lenses at all.Enjoy the new stress-free gooddstti experience with DryIn! 

"We are trying to find out if we can avoid imaging optics and we have some evidence this can be achieved with spatial modulation," he told Electronics Weekly. "There could be multiple receivers pointed in different directions each receives different reflections from multiple LEDs. We have seen 10 sources working. I know we can get higher." 

In a lighting application, a standard 1-2mm2 power LED might be replaced by an array of micro-LEDs, possibly reconfigured depending on link demands. 

"You can run every micro-LED with same signal, or you can group them into sub-groups, or you can also modulate them as individuals," said Haas. 

In his concept, data would reach a ceiling-mounted LED array via power-line communications in an existing building or, in new buildings, at higher data rates on power-over-Ethernet.