Not Signed-In
Select and review.
30 JANUARY 2012

Will Li-Fi be the new Wi-Fi?

"FLICKERING lights are annoying but they may have an upside. Visible light communication (VLC) uses rapid pulses of light to transmit information wirelessly. Now it may be ready to compete with conventional Wi–Fi.

'At the heart of this technology is a new generation of high–brightness light–emitting diodes,' says Harald Haas from the University of Edinburgh, UK. 'Very simply, if the LED is on, you transmit a digital 1, if it's off you transmit a 0,' Haas says. 'They can be switched on and off very quickly, which gives nice opportunities for transmitting data.'

It is possible to encode data in the light by varying the rate at which the LEDs flicker on and off to give different strings of 1s and 0s. The LED intensity is modulated so rapidly that human eyes cannot notice, so the output appears constant. ...

But some sound a cautious note about VLC's prospects. It only works in direct line of sight, for example, although this also makes it harder to intercept than Wi–Fi. 'There has been a lot of early hype, and there are some very good applications,' says Mark Leeson from the University of Warwick, UK. 'But I'm doubtful it's a panacea. This isn't technology without a point, but I don't think it sweeps all before it, either.'"

(Jamie Condliffe, 28 July 2011)

Jamie Condliffe (2011). New Scientist magazine, 23 July 2011.

Fig.1 Harald Haas, July 2011, TED.com.

2). Steve Perlman "Distributed–Input–Distributed–Output (DIDO) Wireless Technology: A New Approach to Multiuser Wireless".

1

TAGS

applied research • bandwidth • broadband over power lines • device • DIDO • DIDO technology • Distributed-Input-Distributed-Output • experimental knowledge • fiber optics • Harald Haas • inventionLEDLED lighting • Li-Fi • LIFI • light • light bulb • lightingphysicsproblem solving researchpulsesignalsolutiontechnology innovation • TED Global • TED Talks • transmitting data • Visible Light Communication • VLC • wireless data • wireless technologies • wireless technology • wireless through LED

CONTRIBUTOR

Simon Perkins
Sign-In

Sign-In to Folksonomy

Can't access your account?

New to Folksonomy?

Sign-Up or learn more.