RE: [Discuss-gnuradio] Benchmark_ofdm_tx Benchmark_ofdm_rx

[matteo zunino]

> Date: Tue, 1 Jul 2008 08:05:55 -0700
> From: address@hidden
> To: address@hidden
> CC: address@hidden
> Subject: Re: [Discuss-gnuradio] Benchmark_ofdm_tx Benchmark_ofdm_rx
>
> On Tue, Jul 01, 2008 at 04:54:22PM +0200, matteo zunino wrote:
> > > On Tue, Jul 01, 2008 at 11:37:22AM +0200, matteo zunino wrote:
> > > >
> > > > Hi,
> > > >
> > > > i've a question about these two functions. My aim is to modify these
> > > > benchmarks in order to create a trasmission system that can choose
> > > > to put on a single carrier a BPSK or a QPSK modulation. My problem
> > > > is this one, how can i comunicate to the receiver what carriers are
> > > > BPSk adn what QPSK?
> > > >
> > > > Thanks a lot
> > >
> > > This is typically done by sending some kind of 'map' at the low rate
> > > at the beginning of packet. Take a look at WiMAX to see how
> > > complicated this can get ;)
> > >
> > > Eric
>
> > I've seen it ;) but i've problem too even if i konw what carriers
> > are BPSK and what are QPSK. I've studied how to modify ofdm.py in
> > order to transmitt for example the first 10 signals with BPSK
> > modulation and tre other with QPSK, but when i want to demodulate, i
> > don't know which point of gr_ofdm_frame_sink.cc i must modify to
> > demodulate correctly. Do you think my project is possible actually
> > in gnuradio OFDM?
>
> Sure it's possible. You'll have to do some work.


Excuse me for the continue questions but i've not such a big experience in Gnuradio. Where i i would modify gr_ofdm_frame_sink.cc in order to arrive to my aim? I don't know c++ language very well and i don't know where i can find it in this function
 Thanks a lot

Matteo

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