[SFDXA] Not AM; not FM but SM

[Kai]

Hi Howard,
The folks at http://www.astrapi-corp.com/
are in a search for funding. They are VERY sparse about the technology, and 
"invented" the name "SM" for what they call spiral modulation. The best that I 
can tell from their (only) published white paper (a master work of mathematica 
obscurata), and some background ad images, is that they are using what Yasaman 
and I patented as "polarization orthogonal keying" (POK) a few years ago. "Not 
SM but POK."

I cannot talks about Astrapi or their technology, because there are not enough 
details - they are in fund raising mode. However, please at least look at the 
two patents US 8081699  and US 8553804. I certainly put something together about 
POK - given some guidance from the BoD. While POK may eventually have some 
application to ham radio, perhaps in the UHF+ range, this would be a very 
speculative topic.

The summaries of our (*Kai Siwiak, Yasaman Bahreini)* patents follow:

*US Patent 8,081,699: Wireless communication system and method with elliptically 
polarized radio frequency signals*
**

_Abstract_: In one embodiment, a UWB (ultrawide-band) transmission system 
includes a pair of crossed linearly polarized antennas, one of which is fed with 
a UWB signal current, while the second is fed with a temporally orthogonal UWB 
signal such as the time-derivative of the UWB signal current. The resultant 
field is elliptically polarized. In another transmission system, a loop and a 
co-located dipole are fed with the same current to generate signal exhibiting 
elliptical polarization. When the energies of the transmissions from each 
antenna are equal, the polarization is circular. In yet another embodiment, a 
polarization modulated transmitting and receiving system is disclosed in which 
the binary states are encoded in orthogonal polarizations, wherein left-handed 
polarization encodes one digital state while right-handed polarization encodes 
another digital data state, and data encoding is additionally provided. Since 
either one circular polarization state can be generated with both UWB pulses 
flipped in polarity, a Polarization Orthogonal Keying (POK) modulation, of 
4-state per symbol in the two orthogonal polarizations is disclosed as one 
example. Thus a UWB transmitting and receiving system is shown that utilizes 
signals that are simultaneously spatially orthogonal and temporally orthogonal, 
and the several combinations of those signal and polarization states encode data 
for transmission.

_Exemplary claim1_: A polarization modulation ultra-wideband (UWB) transmission 
system, comprising: an antenna system that is configured to emit first and 
second radiated RF signals that are orthogonally polarized in space when the 
antenna system is driven by first and second drive signals, respectively; and a 
transmitter, coupled to the antenna system, that drives the antenna system with 
the first and second drive signals, the first and second drive signals being 
configured to cause the first and second radiated RF signals to be orthogonal in 
time when emitted by the antenna system, the transmitter including: an input for 
receiving data; and a polarization orthogonal keying (POK) encoder, coupled to 
the input, the POK encoder imparting a positive or negative polarity to the 
first drive signal and imparting a positive or negative polarity to the second 
drive signal, to encode the first and second radiated RF signals with the data.

*US Patent 8,553,804: Wireless communication system and method with elliptically 
polarized radio frequency signals*:

_Abstract_: In one embodiment, a UWB transmission system includes a pair of 
crossed linearly polarized antennas, one of which is fed with a UWB signal 
current, while the second is fed with a temporally orthogonal UWB signal such as 
the time-derivative of the UWB signal current. The resultant elliptically 
polarized radiated fields are simultaneously orthogonal in space and orthogonal 
in time. In another transmission system, a loop and a co-located dipole are fed 
with the same current to generate signal exhibiting elliptical polarization. 
When the energies of the transmissions from each antenna are equal, the 
polarization is circular. Thus a UWB transmitting and receiving system is shown 
that utilizes signals that are simultaneously spatially orthogonal and 
temporally orthogonal, and the several combinations of those signal and 
polarization states encode data for transmission.

_Exemplary claim1_: An ultra-wideband (UWB) transmission system, comprising: an 
antenna system that is configured to emit first and second radiated RF UWB 
signals that are orthogonally polarized in space when the antenna system is 
driven by first and second drive UWB signals, respectively; and a transmitter, 
coupled to the antenna system, that drives the antenna system with the first and 
second drive UWB signals, the first and second drive UWB signals being 
configured to cause the first and second radiated RF UWB signals to be 
orthogonal in time and to occur simultaneously in time when emitted by the 
antenna system; wherein the antenna system comprises an electric antenna and a 
magnetic antenna that are co-located and oriented to emit the first and second 
radiated RF UWB signals that are orthogonal in space, and the transmitter drives 
both the electric antenna and the magnetic antenna with the same drive signal 
such that the first and second radiated RF UWB signals are orthogonal in time.

===

If after reviewing the above, and perhaps some of the Figures in the patents 
(they are really cool!), you still feel that it is a worthy ham presentation for 
The SFDXA, we can move further.
I'm stalling because it would take a rather extreme effort to put an interesting 
talk on POK that is devoid of "mathmatica obscurata". I want to know that the 
effort will be worth it!
Cheers
Kai, KE4PT


On 3/19/2019 12:06, Howard Rensin wrote:
> Kai;
> How about a presentation of SM at a future SFDXA?
>
> 73
> Howard
> KC3D
> Palm Beach Gardens, FL
> Life member: ARRL; QCWA; SKCC; and a bunch of others.
> South Florida DX Assoc. (SFDXA)
> KC3D at arrl.net
>
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