Hi Phil,
Short range (~20 mile) point-to-point and point-to-multipoint high speed data is the primary purpose.
QPSK, 16QAM and 64QAM will be the modulations, depending on speed requirements.
Depending on speed required, it can very from 5mhz (12mb/sec) to 10mhz (24mb/sec) in micro channel mode.
The standard is 54mb/sec channel using 20mhz of spectrum.
Super channel usage at 108mb/sec is 40mhz of spectrum (bonds 2 20mhz channels together).
BTW, this follows the exact same specifications as the IEEE 802.11a modulation system which operates in the 5ghz part 15 UNNI spectrum.
The only change/addition is the ability to use micro sized channels, where as 802.11a does not permit this functionality.
Seeya, Dave KG4YZY www.aprsfl.net
>This would be helpful in the design of modulation methods >as well as bandwidths and frequency selection to minimize >or eliminate mutual interference. > >The biggest issue is power spectral density. An >unmodulated carrier component often causes trouble >because it's a spectral line with theoretically infinite >power spectral density. On the commercial satellite >bands, which historically were shared with terrestrial >point-to-point links, the FCC imposes power spectral >limits that effectively ban discrete carriers. We don't >have those regulations on the ham bands, but we still >want to avoid interference. > >The usual fix is scrambling or spreading, but this >increases complexity so we'd like to know if we have to do it.