Profile image
By Alton Parrish (Reporter)
Contributor profile | More stories
Story Views

Now:
Last Hour:
Last 24 Hours:
Total:

Two Radio Signals on One Chip Open a New World for Wireless Communication

Tuesday, March 14, 2017 1:33
% of readers think this story is Fact. Add your two cents.

(Before It's News)

Cornell engineers devised a method for transmitting and receiving radio signals on a single chip, which could ultimately help change the way wireless communication is done.

Separating the send and receive bands is difficult enough, but the problem is compounded by the ever-increasing number of bands in the latest devices, which handle everything wireless technology has to offer. From GPS to Bluetooth to Wi-Fi, each band requires a filter to stop the strong transmit signals from drowning out reception.

Radio Chip
B4INREMOTE-aHR0cHM6Ly8zLmJwLmJsb2dzcG90LmNvbS8tT2NWQ1RuTFI3VGMvV01aZkZUeEJfVEkvQUFBQUFBQUJWcTAvQUtJcTBFak1OTlFIa2w5WXdyaFQySTl4c1lud05HYXJnQ0xjQi9zNjQwL1JhZGlvJTJCQ2hpcC5qcGc=
Credit: Cornell University
Alyosha Molnar, associate professor of electrical and computer engineering (ECE), and Alyssa Apsel, professor of ECE, have come up with an ingenious way to separate the signals. Their work is described in “A wideband fully integrated software-defined transceiver for FDD and TDD operation,” published online in the Institute of Electrical and Electronics Engineers’ Journal of Solid-State Circuits.
Their idea lies in the transmitter — actually a series of six subtransmitters — all hooked into an artificial transmission line. Each of the subtransmitters send signals at regular intervals, and their individually weighted outputs are programmed so that they combine to produce a radio frequency signal in the forward direction, at the antenna port, while canceling out at the receive port.

The programmability of the individual outputs allows this simultaneous summation and cancellation to be tuned across a wide range of frequencies, and to adjust to signal strength at the antenna.

Al Molnar, holding a test board with the two-way transceiver chip mounted in the center, is shown with graduate student Hazal Yüksel in Molnar’s lab. Yüksel is co-lead author of the latest paper from the Molnar lab, published earlier this year in the Journal of Solid-State Circuits.

B4INREMOTE-aHR0cHM6Ly8zLmJwLmJsb2dzcG90LmNvbS8tLUExOC1pY3RkbnMvV01aZmJjOVpEbUkvQUFBQUFBQUJWcTQvd3BUMi1nOEF2RjBWbUptU09rd0FkSDRVWTVIX05pSVJRQ0xjQi9zNjQwLzEzNTMxMV93ZWIuanBn
Credit: Cornell University

“In one direction, it’s a filter and you basically get this cancellation,” Apsel said. “And in the other direction, it’s an amplifier.”

“You put the antenna at one end and the amplified signal goes out the antenna, and you put the receiver at the other end and that’s where the nulling happens,” Molnar said. “Your receiver sees the antenna through this wire, the transmission line, but it doesn’t see the transmit signal because it’s canceling itself out at that end.”

This work builds on research reported six years ago by a group from Stanford University, which devised a way for the transmitter to filter its own transmission, allowing the weaker incoming signal to be heard. It’s the theory behind noise-canceling headphones.

Unlike the Stanford work, the Cornell group’s subtransmitter concept will work over a range of frequencies – a positive in this age of scrambling for available frequencies that used to be the realm of over-the-air television.

“This wire is a fairly broadband structure,” Molnar said. “And the thing you do to make it work over a wide range of frequencies is just control those different subgains of the transmitters to make this cancellation always happen.”

Instead of needing a filter for every band, signal separation can be controlled digitally. Upgrading to the latest version would be like updating an app – as simple as downloading the latest software.

Financial support for this work came from the Defense Advanced Research Projects Agency.
Contacts and sources:
Daryl Lovell

Cornell University

Citation: A Wideband Fully Integrated Software-Defined
Transceiver for FDD and TDD Operation
Hazal Yüksel, Student Member, IEEE, Dong Yang, Zachariah Boynton, Changhyuk Lee, Member, IEEE,Thomas Tapen, Alyosha Molnar, Member, IEEE, and Alyssa Apsel, Senior Member, IEEE



Source: http://www.ineffableisland.com/2017/03/two-radio-signals-on-one-chip-open-new.html

Report abuse

Comments

Your Comments
Question   Razz  Sad   Evil  Exclaim  Smile  Redface  Biggrin  Surprised  Eek   Confused   Cool  LOL   Mad   Twisted  Rolleyes   Wink  Idea  Arrow  Neutral  Cry   Mr. Green

Top Stories
Recent Stories
 

Featured

 

Top Global

 

Top Alternative

Register

Newsletter

Email this story
Email this story

If you really want to ban this commenter, please write down the reason:

If you really want to disable all recommended stories, click on OK button. After that, you will be redirect to your options page.