Or you could squeeze in 50% more information in the same noise
bandwidth, which could be
used for FEC or somesuch, or something else *fun*..
Given that this implementation is heavily aimed at "existing HF gear",
it does not make much sense
going *much* below standard SSB filter bw. People will just squeeze
together and then you are
trying to decode 1.5 transmissions, 0.5 of another QSO.
Gullik
On 06/05/2013 10:37 PM, Bruce Perens wrote:
Yes, in theory you can do without the guard bands, which is worthy of
exploration. But you can slow down the symbol rate or use fewer
carriers, so you don't really have to transmit faster.
On 06/05/2013 01:32 PM, Gullik Webjörn wrote:
This is something I raised a year ago or so. I have been learned that
the very reason to use ofdm is
that the "next" carrier is located on the "previous" and the
"nextnext" NULL, i.e. there is a minimum
"right there", and that given imperfect filtering, with the integer
relation between carrier spacing
and baud rate do 2) below. Net effect, still in MY head, is that you
could either increase signalling
to 75 baud, or squeeze carriers together. Now, signalling at 75 baud
instead of 50, will burden
us CPU-wise, since all maths done in 20 mS must now be done in 13.33
mS. I guess the answer probably
lies in 3).
One more very interested...
Gullik
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