[Elecraft] OT: Distinguishable angular momentum in radio photons?

[Sverre Holm (LA3ZA)]

This is the debunking saying that this is more or less a special case of MIMO
- Multiple Input Multiple Output - communications, i.e. using multiple
antennas on the rx and tx sides:

"Is orbital angular momentum (OAM) based radio communication an unexploited
area?" Ove Edfors and Anders J Johansson, IEEE TRANSACTIONS ON ANTENNAS AND
PROPAGATION, 2012

http://www.lunduniversity.lu.se/o.o.i.s?id=12683&postid=2062936

Abstract: "We compare the technique of using the orbital angular momentum
(OAM) of radio waves for generating multiple channels in a radio
communication scenario with traditional multiple-in-multiple-out (MIMO)
communication methods. We demonstrate that, for certain array configurations
in free space, traditional MIMO theory leads to eigen-modes identical to the
OAM states. From this we conclude that communicating over the sub-channels
given by OAM states is a subset of the solutions offered by MIMO, and
therefore does not offer any additional gains in capacity."


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Sverre, LA3ZA

K2 #2198, K3 #3391
LA3ZA Unofficial Guide to K2 modifications 
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