Posted on 14 Nov 2012
Filed Under (Uncategorized) by dpr

Bob Frankston suggested I post some of my recent remarks and references to Orbital Angular Momentum and its potential value in increasing the capacity of “spectrum” (the word I think misleads everyone, but that’s a subject I’ve talked about a lot). So I did put up a brief page here, with some references also. I believe my comments made it onto Dave Farber’s Interesting People list, though I do not follow that list.

This is part of my general quest to get the wireless community to stop thinking about radio as “colors” and “rays” and “channels”, since they are poor approximations to the physics of EM waves, based on Marconi’s techniques for CW multiplexing of morse code. I wish the regulators were far more cognizant of the fundamental physics and our modern Computational Radio toolkit – the path I started following back in 1994, when I got fascinated with wavelet analysis and UWB Impulse Radio and their bases in physics and connection to information theory.

(1) Comment   


zeno on 12 December, 2012 at 10:06 #

I came up with these things recently
I am Physicist in my education and I teach Quantum Mechanics to undergraduates and make research in the field of Fiber optics Communications
Now I would not be so clear cut as you about the “quarrel” MIMO versus OAM
What I think is that MIMO actually leads to the same results as OAM which is essentially Quantum Mechanics
The two approaches (MIMO and OAM) start from very different mathematical aprroaches and assumptions
The thing is that people doing MIMO never get the opportunity to talk with Physicists, the two worlds are separate since many years, but both deal with electromagnetic waves.
The importnat thing to stress is that radio-wireless technology deals with “coherent” EM waves meaning that also the phase of the wave is used (this is true since the birth of radio). The mathematical tools used in Wireless technology (used for coding, equalization and optimization) are very sophisticated and are based on Information Theory (Shannon 1948) now Information Theory is not a part of “actual Physics” scientists “start” to “integrate” it in the field of Quantum Information.

I do not think that “quarrels” knowing who is right or wrong bring something to the debate.

If MIMO and OAM are two ways of describing the same thing ?

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