Jacopo wrote:
Thanks a lot!!!!
Another question: It's possible to have adaptive modulation, that is
the possibility to use different modulation for any subcarrier?
Bye
Jacopo
No, not in the current implementation. You'll have to create a new
ofdm_modulator block to handle this behavior.
On that note, that's really the entire point of what we've created (or
will have once the issues are all worked out). We wanted to show the
basics of a general OFDM modulator/demodulator so that others can build
from there with their own interesting stuff.
Tom
2008/2/3, Thomas Rondeau <[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>>:
Jacopo wrote:
> Thanks! But where can i check this parameter?
>
> Is it possible that fft_length= occupated carrier
(--occupied-tones in
> blksimpl/ofdm.py) + un_used carrier ? Where can i set the
position of
> the occupated_bins?
>
> bye
To modify the bandwidth, you have to set the interpolation and
decimation rates. Yes, fft_length is the size of the FFT or total
number
of subcarriers. Of this, only occupied-tones are used to carry
data. The
unused carriers are distributed evenly on the carriers and you cannot
modify this behavior in the parameters currently, i.e., we do not
support non-contiguous OFDM.
Tom
> 2008/2/2, Matt Ettus <[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>
<mailto:[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>>>:
>
> Jacopo wrote:
> > Hello I'm studing an OFDM implementation on gnuradio. I
want to
> modify
> > benchmark_ofdm_tx.py.
> >
> > I have just read ofdm.py and trasmit_path.py but I can't
find how
> > change some parameters.
> >
> > I'd want a bandwith of 20Mhz, where I can set this option?
Where
> can I
> > set the carriers number? And the pilot bins?
> >
> > Is it possible to set an adaptive modulation for
differents carriers?
>
> The USRP hardware is not capable of bandwidths that
high. You are
> best
> off staying around 6 MHz.
>
> Matt
>
--
www.fotofestefirenze.it <http://www.fotofestefirenze.it>
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