Shaun:
The ITU-R data rate requirement on the Global Third Generation (G3G)
IMT-2000 wireless systems is 144 Kb/s for high speed vehicles with speed up
to 500 Km/hr and is 2 Mb/s for indoor or stationary aplications. The
commercial deployment of 3G IMT-2000 systems is expected to start in May
2001 in Japan.
Are such data rates of IMT-2000 wireless mobile services sufficient for your
applications?
Sing Lin
-----Original Message-----
From: [email protected] [mailto:[email protected]]On
Behalf Of [email protected]
Sent: Saturday, September 30, 2000 1:51 AM
To: [email protected]
Subject: Moving Targets
Hi,
I'm doing a research project about providing Internet access to moving
targets on the eastern seabord of Australia. In this case, the moving
targets are trains.
We really need to provide around 1MB or so downstream, maybe 56k or so
uplink. I've been doing a lot of searching but facts seem to be hard
to come by.
By my reckoning something like a link to an LEO constellation is
needed to make this work because:
- GEO satellites can't easily provide this type of bandwidth
- GEO satellites require reasonably large dishes and need to
fairly precisely targetted at the sat
- Line of sight is needed for GEO links to work
Basically, I'm hoping that with LEO links a dish won't even be
required, some sort of antenna? Do any of the currently existing LEO
constellations provide this sort of service? Future ones?
Am I completely barking up the wrong tree here? Is there a better way
of providing reasonably high speed internet access to moving vehicles
without cabling etc.
Thanks in advance,
Shaun
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