Feeds

Cancellation technique doubles wireless throughput

Full duplex, one frequency, no trouble

Top three mobile application threats

Researchers at Rice University have pulled a neat trick of noise cancellation which they say could double the throughput of wireless systems, by allowing full-duplex communications using a single frequency.

As El Reg readers surely know, wireless systems use either time- or frequency-domain multiplexing (or a mixture of the two) to support two-way communication. Either the transmit and receive channels use different frequencies; or only one direction transmits at any given time.

The idea that frequency multiplexing could be eliminated would be highly attractive to mobile carriers, since they would effectively double the capacity of their spectrum, without spending a cent.

The problem with using the same frequency to transmit and receive is that it’s hard to distinguish one signal from another.

The Rice researchers used a quite simple trick to get around the problem: with two antennas at a transmitter (call it the “A end”), it’s possible to identify what’s been sent from the A end and subtract it from the received signal; what’s left over should be the signal from the other station – the B end.

The researchers have published their paper http://arxiv.org/pdf/1107.1276v1 here.

Although the technique has been touted as a saviour for future cellular communication standards, it should be noted that the researchers’ experiments were conducted on indoor scenarios under favourable conditions. ®

Top three mobile application threats

More from The Register

next story
A black box for your SUITCASE: Now your lost luggage can phone home – quite literally
Breakfast in London, lunch in NYC, and your clothes in Peru
Broadband Secretary of SHEEP sensationally quits Cabinet
Maria Miller finally resigns over expenses row
EE dismisses DATA-BURNING glitch with Orange Mail app
Bug quietly slurps PAYG credit - yet EE denies it exists
Like Google, Comcast might roll its own mobile voice network
Says anything's possible if regulators approve merger with Time Warner
Turnbull leaves Australia's broadband blackspots in the dark
New Statement of Expectations to NBN Co offers get-out clauses for blackspot builds
Facebook claims 100 MEEELLION active users in India
Who needs China when you've got the next billion in your sights?
Facebook splats in-app chat, whacks brats into crack yakety-yak app
Jibber-jabbering addicts turfed out just as Zuck warned
prev story

Whitepapers

Designing a defence for mobile apps
In this whitepaper learn the various considerations for defending mobile applications; from the mobile application architecture itself to the myriad testing technologies needed to properly assess mobile applications risk.
3 Big data security analytics techniques
Applying these Big Data security analytics techniques can help you make your business safer by detecting attacks early, before significant damage is done.
Five 3D headsets to be won!
We were so impressed by the Durovis Dive headset we’ve asked the company to give some away to Reg readers.
The benefits of software based PBX
Why you should break free from your proprietary PBX and how to leverage your existing server hardware.
Securing web applications made simple and scalable
In this whitepaper learn how automated security testing can provide a simple and scalable way to protect your web applications.