thanks Vanessa
On Tue, Jan 31, 2012 at 12:21 PM, Friederike Maier <friederike.ma...@ikt.uni-hannover.de> wrote: > Hi > > I was also looking around the OFDM Modulation recently. Found this nice > project here: http://people.csail.mit.edu/szym/rawofdm/README.html > where ofdm mod and channel est are done separately. I didn't had the > time to follow ths more...perhaps it helps. > > best, friederike > > On 01/20/2012 02:38 PM, vanITA1082 wrote: >> >> Did you solve it? >> >> I am trying to add FEC in the OFDM chain but I didn't figure out how to do >> this, yet. >> >> Any advice or do you know if someone did it and the code is public? >> >> Thanks >> >> Veljko Pejovic wrote: >>> >>> Hi, >>> >>> I tried to use trellis_encoder from trellis package to perform >>> convolution coding before sending the message to the OFDM modulator. >>> However, ofdm_mod has zero input signature, and relies on send_pkt() >>> which calls ofdm_packet_utils.make_packet() and then puts the message >>> in the queue at gr.ofdm_mapper_bcv. Since the chain basically starts >>> with ofdm_mod I don't see the way to connect the trellis_encoder >>> before the signal is already modulated. In ftw80211 project they >>> modify ofdm_packet_utils and write their own convolution coding >>> method, I could do the same, but then I would miss all the benefits of >>> this nice trellis package. >>> >>> Interestingly, the other modulation blocks such as dbpsk or d8psk have >>> different input signatures, and I would put the trellis_encoder >>> between the gr.message_source and modulator in pkt.py. Is there a way >>> to seamlessly introduce trellis_encoder in the flow graph with an OFDM >>> modulator? Am I missing something here? >>> >>> >>> Thanks, >>> >>> >>> Veljko >>> >>> >>> _______________________________________________ >>> Discuss-gnuradio mailing list >>> Discuss-gnuradio@gnu.org >>> http://lists.gnu.org/mailman/listinfo/discuss-gnuradio >>> >>> >> > > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio -- Vanessa GARDELLIN, Ph.D. Researcher Institute for Informatics and Telematics (IIT), Italian National Research Council (CNR) Via G. Moruzzi 1 56124 Pisa - ITALY Phone: +390503158297 Room: B65/c E-mail: vanessa.gardel...@iit.cnr.it WWW: http://www.iit.cnr.it/staff/vanessa.gardellin/ Skype: gardellin.vanessa _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
