Google backs 'white space' wi-fi

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Google is pressing the US government to allow the unlicensed
frequencies of TV "white space" to be used for wi-fi.
The firm has written an open letter to regulators saying the US
spectrum was a "once in a lifetime opportunity".

White space is unused blocks of frequencies in-between channels
broadcast on analogue airwaves.

"The vast majority of viable spectrum in this country simply goes
unused, or else is grossly underutilised," wrote Google's Richard
Whitt in the letter.

"Unlike other natural resources, there is no benefit to allowing this
spectrum to lie fallow," he added.

Google has said the white space could be used to bring "ubiquitous
wireless broadband access to all Americans".

In the past TV broadcasters have opposed the use of white space,
fearing it would cause interference with television programming.

But in its letter, Google urged the FCC to adopt a series of
overlapping technologies, including "spectrum sensing," designed to
prevent signals from interfering with each other.

Mr Whitt said there was enough unused spectrum for businesses to
create a wide range of options, such as building small peer-to-peer
networks or even establishing an alternative national wireless

Google has said that devices designed to take advantage of the white
space spectrum could be on the market by the end of 2009.

Other countries are also looking at using white space spectrum.

In the UK much of this space is being dedicated for use by services
like wireless microphones for broadcast use, and for cognitive radio,
a smart wireless technology that allows for the use of wi-fi.

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