The sensitive question:
What happened in Finland when CDMA was to become
one of the four licencees was that the question about
"neighbouring" bands, guardbands,etc became important.
As this is a "sensitive" thing, not much more was made
public.
However, guardbands has always been important, as well
as filters, spurios stuff,sidelobes, etc. CDMA2000
does not separate the subchannels within one 5Mhz, in fact
they overlap, and one should at least ask the question what
happens to the neighbouring 5Mhz bands.
The traditional sensitive thing is that this is a question
of two things
- the level of emergy transmitted on the neighbouring
bands (under varying, different conditions as well as
equipment)
- the sensitivity to energy from neighbouring bands
(also under different,varying conditions as well as
equipment)
That is, a typical case of having to cooperate to
coexist in a crowded space, set up and agree on guidelines
and rules, sometimes involving very intimate details (of the past,present and the plans for the future).
Ilmarinen
Btw, to my knowledge the application for the one
of four CDMA 3G license was withdrawn, but intimate
details like this are rarely hung out the window,
so don't trust me on this.
Btw,btw, I'm too, like others, a little tired of the
"regulatory barriers" in a field which includes factors
like global roaming, coexistence in the same "ether",
neighbouring frequencies and bands, even interconnections,
that is, something which is a prime example of regulations,
guardbands and barriers. (even hanging antennas in the same
mast, side by side) |
