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LarryM99
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re: Radio waves beamed with a twist allow massive multiplexing
LarryM99   3/14/2012 10:10:18 PM
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Either an April Fool's prank or a granted patent. It's getting harder and harder to tell those two things apart these days... Larry M.

old account Frank Eory
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re: Radio waves beamed with a twist allow massive multiplexing
old account Frank Eory   3/14/2012 8:25:04 PM
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As soon as I read "have solved the problem of radio congestion by cleverly twisting radio waves into the shape of fusilli pasta" I assumed it was an early April Fool's joke :)

PJames
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re: Radio waves beamed with a twist allow massive multiplexing
PJames   3/14/2012 7:17:58 PM
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Actually, MIMO techniques very easily decode 2 streams of data on cross polarized antenna even in the presence of the sources of "coupling" or "interference" you mention. It would seem this article is claiming something beyond that, however.

ivovi
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re: Radio waves beamed with a twist allow massive multiplexing
ivovi   3/14/2012 1:28:01 PM
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Hmmmm. Although I think the experiment is OK, but... 1) This is nothing new - it is just subset of spatial diversity system or MIMO theory, as you want. 2) No infinite information space is embeded in this as stated. 3) Just more antenna makes more capacity, but only for short distance. I higly reccomend this paper from Lund University: http://lup.lub.lu.se/luur/download?func=downloadFile&recordOId=2062936&fileOId=2339120

agk
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re: Radio waves beamed with a twist allow massive multiplexing
agk   3/13/2012 11:00:33 AM
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This seems to be a narrow beam width application suitable for point to point communication. Even if it is so lot of bandwidth saved. Is this possible in omni directional communications?

MeirG
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re: Radio waves beamed with a twist allow massive multiplexing
MeirG   3/13/2012 10:12:48 AM
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Yes indeed, this is yet another multiplexing method, polarization. And the technology hurdles are quite high. Polarization changes with reflections from buildings, trees, fog, rain, and other objects. The interference of direct and reflected waves at the reception antenna (antennae?) makes the polarization rather complex, if not impossible to decode. But hey, other technologies also looked impossible when proposed, so... lets hope!

BOB GUNNELS
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re: Radio waves beamed with a twist allow massive multiplexing
BOB GUNNELS   3/13/2012 9:49:22 AM
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This is either an April fools joke that was mistakenly published several weeks too early, or it is just another scam to solicit investments from the uninformed.

masher
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re: Radio waves beamed with a twist allow massive multiplexing
masher   3/13/2012 12:10:46 AM
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I can't see the video or get to the article on this PC but this just sounds like a combination of FDMA and TDMA signals multiplex with antennas using right an left hand circular polarization of multiple carriers. Early Comunity microwave tv used similar methods with 2 different linear polarizations on the same carrier frequency. I remember mechanically changing the feedhorn from horizontal to vertiocal polarization to null the other signal years ago in home brew 2.4 Ghz tv receivers.

PJames
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re: Radio waves beamed with a twist allow massive multiplexing
PJames   3/12/2012 9:30:36 PM
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Can anyone provide a quick description of what this really is or isn't? The paper makes some reference to discrete photon quantum eigenstates in the introduction. A quick glance at the rest of the paper makes it seem as if maybe what they are doing is simply using circularly polarized antennas and somehow tracking dynamic multipath spatial nulls created by the signal rotation. I'm I way off base? Does this look real or simply smoke and mirrors?



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