To exploit an angular momentum modulation we need a demodulator able to recognize that angular momentum... nowadays our demodulators cannot go beyond amplitude, phase and their combination. Maybe I'm missing something...
On Tue, Jul 17, 2012 at 6:59 PM, Michael Baker <[email protected]> wrote: > Timenutters-- > > Along the lines of splitting time into small increments, there > is an interesting article in the May 2012 issue of the > IEEE Spectrum Journal. > > It describes experiments with what I am calling "cork-screw > time-shift phasing modulation" or "orbital time-delayed angular > momentum phasing" for lack of a better description of the > process. This is not the same as circular-polarization of a > radiated signal. > > Visualize a 4-ft dia parabolic reflector which has been cut > (sliced) in a straight line from any arbitrary point on its outer > edge to its center. Then, at the outer lip of the reflector > surface, pull one side of the cut about a foot forward of the > other side of the cut. The separation is greatest at the edge > of the dish, gradually becoming less and less as the cut > approaches the center of the dish. > > The concept is that RF energy from the feed progressively > strikes different areas of the dish slightly ahead (time-wise) > from RF energy that strikes other parts of the dish. Because > the surface of the dish resembles a cork-screw the signal > from the dish has elements that are time-delayed with > respect to other parts. Accordingly, data elements can be > incorporated into the signal which have sightly different > time-delay angular momentum properties. Again, the folks > working on this insist that this is not the same as circular > polarity of the radiated signal such as is obtained with a > helix antenna. > > At the receive end, the process is reversed, producing a > signal which when demodulated can contain extra levels > of data modulation superimposed on it. > > The article points out that there are skeptics of the process > who say that this same modulation procedure can be done > with other methods although the modulation and demodulation > process would be much more complex. > > The orbital angular momentum of photons in the optical > realm has been extensively studied, although applying these > principles to RF is something new. > > Mike Baker > ------------------------------ > > > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
