---------------------------------------- > Date: Tue, 1 Jul 2008 08:44:37 -0700 > From: [EMAIL PROTECTED] > To: [EMAIL PROTECTED] > CC: discuss-gnuradio@gnu.org > Subject: Re: [Discuss-gnuradio] Benchmark_ofdm_tx Benchmark_ofdm_rx > > On Tue, Jul 01, 2008 at 05:17:06PM +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 > > Matteo, I haven't looked at this code in a while and don't plan to at > this time. I'm working on other pieces of GNU Radio right now. > > You asked me if it's possible, and I said yes. It will take some > study and some work. Perhaps this is an opportunity to improve your > programming skills? You may have to look beyond gr_ofdm_frame_sink.cc > and understand how the whole OFDM system is put together. > > Each piece and feature of GNU Radio got written because somebody cared > about that part. We all started out knowing nothing. You appear to > be the person that cares about doing different modulations on > different subcarriers. You know what you want. You know a little bit > about the current code. You're exactly where you're supposed to be to > get started on it... > > Good luck! > Eric
Sorry, i don't want to look at this function but only know if you have already look at it ;) however, Thanks a lot for all the informations you give me. Hi, sorry again for the disturbe. Matteo _________________________________________________________________ Scarica Windows Live, un mondo di programmi per te! http://get.live.com/ _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
