Italian and Swedish researchers have Bring a new technique of transmitting multiple signals

Researchers effort finding better wireless solution : group of Italian and Swedish researchers have Bring a new technique of transmitting multiple signals on the same frequency in wireless technology. This novel radio-technique allows the execution of, in principle, an infinite number of channels in a given, fixed bandwidth, even without using polarization, multi port or dense coding techniques. "This Technique paves way for innovative techniques in radio science and entirely new paradigms in radio-communication protocols that might offer a solution to the problem of radio-band congestion." They are from the University of Padova, Italy, and the Angstrom Laboratory, Sweden, devised a solution to the problem by manipulating waves so that they can hold more than one channel of information. They were able to twist radio waves akin to that of fusilli pasta, allowing nearly limitless numbers of channels to be received and broadcasted. The proliferation of smartphones, wireless internet and digital Tele-vision has continually shrunk the number of radio-frequency bands available to broadcast information. "You just have to try sending a text message at midnight on NewYear's Eve to realise how congested the bands are," stated Fabrizio Tamburini, lead author of the Researchers. A wave can twist about its axis a certain number of times in either a clockwise/counterclockwise, meaning there are several configurations that it can adopt. "In a 3D perspective, this phase twist looks like a fusilli pasta-shaped beam. Each of these twisted beams can be independently generated, propagated and detected even in the very same frequency band, behaving as independent communication channels," Tambourine said.

Researchers demonstrate transmitted two twisted radio waves, in the 2.4 - GHz band, over a distance of 442-m from a lighthouse on SanGeorgio - Island to a satellite dish on a balcony of Palazzo Ducale on the mainland of Venice, where it was able to pick up the two separate channels. "Within reasonable economic boundaries, one can think about using 5 orbital angular momentum states, from - five (counterclockwise) up to five (clockwise), including untwisted waves. In this instance, we can have 11 channels in one frequency band. It is possible to use multiplexing, like in digital Television, on each of these to implement even more channels on the same states, which means one could obtain 55 channels in the same frequency band," said Tambourine. In addition to increasing the quantity of information being passed around our planet, this new discovery could also help lend an insight into objects far out in our galaxy. Black holes, for example, are constantly rotating and as waves pass them, they are forced to twist in line with the black hole. According to Tambourine, analyzing the incoming waves from the super massive black hole at the centre of the Milky Way, Sagittarius A, could help astronomers obtain crucial information about the rotation of this "million-solar mass monster." Their results have been reported on March two, in the Institute of Physics and German Physical Society's New Journal of Physics.