4 ms·
To me this looks like good old circular polarization. http://en.wikipedia.org/wiki/Polarization_%28waves%29 http://en.wikipedia.org/wiki/Polarization_%28waves%
by dosenwurst 15y ago
To me this looks like good old circular polarization.
http://en.wikipedia.org/wiki/Polarization_%28waves%29 http://en.wikipedia.org/wiki/Polarization_%28waves%29
- ars 15y agoNo, that's well known, and is only half of the rotation. (A rotation of the angle between the electric and magnetic fields.) This is apparently something new, not sure what though - it's not something I ever learned about with photons.
- dvdkhlng 15y agoNot sure that this is new. It is known that channel capacity can be scaled up linearly with the number of receive/transmit antennas by properly de-mixing the signal at the receiver (or pre-coding it properly at the sender). This is known as MIMO transmission, see https://en.wikipedia.org/wiki/MIMO https://en.wikipedia.org/wiki/MIMO for details (also has the capacity formula). What these people call "vortex wave", is just precoding/decoding done in a fixed way using fixed antennas. But with non-line-of sight channels and moving sender/receiver you will need dynamic MIMO coding anyways. This is already implemented in LTE (2 antennas in the handset, 4 at the base station, AFAIR).
- philwise 15y agoThat would be my guess too, especially as two crossed yagis are a well known way to receive circular polarized signals: http://www.qsl.net/dk7zb/Cross-Yagi/crossyagi.htm http://www.qsl.net/dk7zb/Cross-Yagi/crossyagi.htm