On Wed, Dec 5, 2012 at 6:39 PM, Bruce Perens <br...@perens.com> wrote:
> I did a talk at Lawrence Berkeley Lab today. Because the group I am working
> with does a lot of things that look very close to radio, I showed Mel's
> recent video as an example of an Open Source project where we are doing real
> science.
>
> I got one technical question privately afterward, which is why aren't we
> using OFDM? This was prompted by the visibility of guard-bands between our
> carriers.
>
> Maybe this is an area for some future Open Source developer. Do you think it
> has the potential to further reduce our spectrum use?

The main challenge with OFDM for amateur use is that the PAPR goes up
substantially with many carriers.
Even when your linearity is good (it certainly isn't for all ham gear,
but thats a prereq for OFDM) most ham gear is peak power constrained.
So poor peak to average ratio translates to lower output power.

There are techniques to address this stuff. Some may be patented
though. See also my post in the thread "PAPR and handheld operation"
on this list and the following responses.

Though sure OFDM is _obviously_ the way to go, after solving/ignoring
all other issues! :P

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