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Data transfer speed will double

09.11.2013

American engineers have learned to receive and transmit data on the same radio frequency - to do what seemed impossible for the last 100 years. The introduction of technology will help to double the speed of data transmission over wireless networks.

Startup Kumu Networks, created in 2012 by Stanford University employees (with an investment of $ 10 million), claims to solve a long-standing problem that it is impossible to send and receive data on the same radio frequency at the same time.

Receiving and transmitting data on the same frequency has a number of advantages, and one of the most important is more efficient use of the frequency spectrum. A breakthrough could double the speed of data transfer over wireless networks, writes Technology Review.

To solve the problem, engineers had to eliminate an effect known as "self-interference". During operation, the radio system sends and receives radio signals, while the power of the sent signals is billions of times greater than the power of the signals it receives. Any attempt at reception is hampered by the fact that the receiver also creates an outgoing signal, causing interference (superposition of radio waves). For this reason, most radio systems - including smartphones, cell phone base stations and Wi-Fi routers that serve them - send information on one frequency and receive on another, or use the same frequency, switching back and forth quickly from transmit to receive.

To eliminate self-interference, engineers from Kumu Networks built an electronic circuit that pre-calculates the amount of interference that the transmitter will create in the next instant and generates a compensation signal to eliminate the interference. The circuit generates a compensating signal during the transmission of each packet of information, which makes it possible to use it in mobile devices in which the elimination of interference is complicated by the fact that devices move in space (due to which the waves are constantly reflected from different objects).

"For the past 100 years, it seemed impossible," commented Sachin Katti, senior lecturer in electrical and computer science at Stanford University and co-founder and CEO of Kumu Networks.

Previously, the compensation method was used by other companies, including Comtech, in order to increase the capacity of satellite communication channels. However, until Kumu Networks, no one has demonstrated the applicability of the method in networks such as LTE and Wi-Fi, in which it is necessary to compensate for signals with five orders of magnitude higher power. That's what the Stanford startup did.

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