Language Selection

English French German Italian Portuguese Spanish

MIT starts second wireless revolution

Filed under

Wireless companies are investing big in new infrastructure that can handle the ever-increasing demand for inexpensive delivery of voice and data. But the solid-state amplifiers that the nation's roughly 200,000 wireless base stations now use to communicate with cell phones and other electronic devices are costly, generate excessive heat (requiring bulky cooling equipment) and need large backup batteries.

MIT researchers are developing an alternative: the first radio frequency (RF) power amplifier based on a ribbon-beam vacuum electron device. The new amplifier combines a half-century-old technology-vacuum electron devices, or "vacuum tubes" in the old terminology-with a recent MIT breakthrough: an elliptical, or "ribbon," electron beam.

A ribbon electron beam is much more efficient for RF amplification than the one-dimensional, pencil-like electron beam that conventional vacuum electron devices emit. A ribbon-beam vacuum electron device requires less energy than either conventional vacuum electron devices or the solid-state transistors that replaced them in many applications decades ago.

In January, Chiping Chen, principal research scientist in the MIT Plasma Science and Fusion Center, and his colleagues published a paper for the American Physical Society on the first-ever successful demonstration of a ribbon electron beam.

"This technology could change how radio-frequency amplifiers are made," said Chen.

These new amplifiers would enable the completion of next-generation wireless networks by dramatically improving throughput and reducing the cost of base stations by 65 percent. Chen believes RBAs have the potential to reduce the cost of delivering voice and data from the current 50 cents per megabyte to five cents per megabyte.

Moreover, their high power and their capacity to operate at low and high frequencies (from 1.9 GHz for third-generation U.S. wireless base stations to 5.8 GHz for WiMAX, or wireless broadband networks) make them "future-proof" for successive generations of wireless networks.

RBAs are a broad-platform technology with a range of applications in not only communication (telephony, WiMAX, satellite communications), but also defense (radar, missile defense) and scientific research (particle acceleration).

This work is funded by the U.S. Department of Energy, the U.S. Air Force Office of Scientific Research, and the MIT Deshpande Center for Technological Innovation.

Full Story.

More in Tux Machines

OSS Leftovers

  • The Future of Marketing Technology Is Headed for an Open-Source Revolution
  • Edging Closer – ODS Sydney
    Despite the fact that OpenStack’s mission statement has not fundamentally changed since the inception of the project in 2010, we have found many different interpretations of the technology through the years. One of them was that OpenStack would be an all-inclusive anything-as-a-service, in a striking parallel to the many different definitions the “cloud” assumed at the time. At the OpenStack Developer Summit in Sydney, we found a project that is returning to its roots: scalable Infrastructure-as-a-Service. It turns out, that resonates well with its user base.
  • Firefox Quantum Now Available on openSUSE Tumbleweed, Linux 4.14 Coming Soon
    Users of the openSUSE Tumbleweed rolling operating system can now update their computers to the latest and greatest Firefox Quantum web browser.
  • Short Delay with WordPress 4.9
    You may have heard WordPress 4.9 is out. While this seems a good improvement over 4.8, it has a new editor that uses codemirror.  So what’s the problem? Well, inside codemirror is jshint and this has that idiotic no evil license. I think this was added in by WordPress, not codemirror itself. So basically WordPress 4.9 has a file, or actually a tiny part of a file that is non-free.  I’ll now have to delay the update of WordPress to hack that piece out, which probably means removing the javascript linter. Not ideal but that’s the way things go.

Red Hat and Fedora Leftovers

Darling ('Wine' for OS X) and Games Leftovers

Linux 4.13.14, 4.9.63, 4.4.99, and 3.18.82