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A team of Italian radio boffins – and one Swede – have one-upped their pioneering countryman Guglielmo Marconi by demonstrating a method of simultaneously transmitting multiple signals on the same frequency. "This novel radio technique allows the implementation of, in principle, an infinite number of channels in a given, fixed bandwidth, even without using polarization, multiport or dense coding techniques," the team explains in a paper in the March issue of the New Journal of Physics.
The sent beam was then encoded with two separate signals timed to occupy opposite angles of the spin, and antennas were set up to receive each of them. Theoretically, much more discrete signal-slicing could fit more signals into the same transmitted frequency.
Originally posted by kawika
I have heard of vertical, horizontal and circular polarization.
But not spinning polarization...
Seems unlikely to work.
Team member Bo Thide of Swedish Institute of Space Physics first conceived the orbital angular momentum idea in a 2007 paper focussed on radio astronomy, but in which he wrote that the concept "paves the way for novel wireless communication concepts." Last year, Tamburini, Thide, and their team demonstrated the multiple-signal technique by beaming two separate audio signals at 2.4GHz, then two television signals, 442 meters from the lighthouse of Venice's San Giorgio Island to the balcony of the Palazzo Ducale. "It's exactly the same place that Galileo first demonstrated his telescope to the authorities in Venice, 400 years ago," Thide told BBC News. As Thide noted, those authorities were skeptical. "They were not convinced at all; they could see the moons of Jupiter but they said, 'They must be inside the telescope, it can't possibly be like that.' To some extent we have felt the same [disbelief from the community], so we said, 'Let's do it, let's demonstrate it for the public'." ®
Originally posted by Imagewerx
In had to check the date,thought maybe I'd slept all the way through March and had woken up on April fools day.
A slightly mangled satellite dish can't "spin" a radio signal as if it's some sort of RF corkscrew and multiplexing by sending numerous different bits of data down one carrier wave or even a single piece of wire has been done successfully for many many years.
Originally posted by kawika
reply to post by braydenf
Subspace radio, like in Star Trek,
now that would be cool.
Here is a helix, commonly called a cork screw. This would give you circular polarization. Kind of a spinning signal.
edit on 2-3-2012 by kawika because: added image