Feeds

DARPA planning 100 Gbps wireless

Seeks interest in development and demonstrations

Next gen security for virtualised datacentres

DARPA (the Defense Advanced Research Projects Agency) has decided that the 200-276 Mbps wireless technology currently used for military communications, known as the Common Data Link, is not going to live forever, and is inviting companies to submit proposals to boost battlefield wireless to an impressive-if-achieved 100 Gbps.

The agency is hosting a “proposers’ day” event in January 2014. It says its Broad Agency Announcement (BAA) will set out the details of its “100G” program, “with the objective to design, build, and test a communications link with fiber-optic-equivalent capacity, long reach, and high availability in airborne-to-airborne and airborne-to-ground configurations that can serve as a deployable data backbone in a military communications network.”

The communications platform would have to match the weight and power specifications of today’s CDL platforms, and provide 200 Km reach for air-to-air links and 100 Km for air-to-ground links.

Since the platform has to operate in all weather conditions, the simplest solution – free-space optics – is ruled out.

DARPA’s media release quotes program manager Dick Ridgeway as saying “Providing fiber-optic-equivalent capacity on a radio frequency carrier will require spectrally efficient use of available RF spectrum … 100G plans to demonstrate how high-order modulation and spatial multiplexing can be synergistically combined to achieve 100 Gigabits per second”.

If, as speculated at ExtremeTech, the 100G program is likely to use Ku-band frequencies, then WiFi’s spectral efficiency of around 11 bits per Hertz doesn’t come even close to 100G’s requirements. The widest transmission allocation in the Ku band in Australia (since that’s the database this writer is familiar with) is 550 Mhz, yielding around 6 Gbps at WiFi rates.

Turning the calculation the other way: at the spectral efficiency of current commercial-grade kit, 100 Gbps would need a radio channel wider than the entire Ku-band, at 9 GHz. Hence the additional attention on spatial multiplexing.

So while there’s no prospect that DARPA is about to render optical fibre obsolete, The Register would anticipate some interesting science to flow from the project. ®

The essential guide to IT transformation

More from The Register

next story
6 Obvious Reasons Why Facebook Will Ban This Article (Thank God)
Clampdown on clickbait ... and El Reg is OK with this
So, Apple won't sell cheap kit? Prepare the iOS garden wall WRECKING BALL
It can throw the low cost race if it looks to the cloud
EE fails to apologise for HUGE T-Mobile outage that hit Brits on Friday
Customer: 'Please change your name to occasionally somewhere'
Time Warner Cable customers SQUEAL as US network goes offline
A rude awakening: North Americans greeted with outage drama
We need less U.S. in our WWW – Euro digital chief Steelie Neelie
EC moves to shift status quo at Internet Governance Forum
BT customers face broadband and landline price hikes
Poor punters won't be affected, telecoms giant claims
prev story

Whitepapers

Endpoint data privacy in the cloud is easier than you think
Innovations in encryption and storage resolve issues of data privacy and key requirements for companies to look for in a solution.
Implementing global e-invoicing with guaranteed legal certainty
Explaining the role local tax compliance plays in successful supply chain management and e-business and how leading global brands are addressing this.
Advanced data protection for your virtualized environments
Find a natural fit for optimizing protection for the often resource-constrained data protection process found in virtual environments.
Boost IT visibility and business value
How building a great service catalog relieves pressure points and demonstrates the value of IT service management.
Next gen security for virtualised datacentres
Legacy security solutions are inefficient due to the architectural differences between physical and virtual environments.