Thank you very much Tom Tom Rondeau wrote: > > On Sat, Jun 19, 2010 at 2:11 PM, Chris_Spain <christianper...@gmail.com> > wrote: >> >> Thanks Tom, but in DVB-H, the continual and scattered pilot are used for >> the >> sync, If I change, in TX and RX, the position and value of knows symbols, >> Will I lost the sync? > > Sure, because DVB-H is a continuous stream, so you don't need to > resync for bursts and the pilots are just used to track it. > > In this case, you would want to get rid of the idea of the known > symbols altogether. Then, you'll need to add the pilot handling code > into the receiver. This will probably call for a pretty thorough > redesign of the ofdm receiver that's in GNU Radio. It will probably > also require you to write a new ofdm sink C++ block to handle the > specifics of the standard. > > Tom > > >> Tom Rondeau wrote: >>> >>> On Sat, Jun 19, 2010 at 1:20 PM, Chris_Spain <christianper...@gmail.com> >>> wrote: >>>> >>>> Hello I'm trying to modify the OFDM module implemented in GNU Radio, >>>> and >>>> I >>>> have a question. In DVB-H I need to set the continual pilot carrier and >>>> the >>>> scattered pilot carrier. Both are known by TX and RX, then, Are the >>>> known >>>> symbols, implemented in OFDM module, pilots carrier? >>>> >>>> Thanks! >>> >>> No, the known symbols are preambles used for initial sync of a burst. >>> There is kind of a placeholder in the code for pilots (in the ofdm >>> mapper), but we haven't implemented anything here to handle them in >>> the receiver. I believe others have done this on their own. >>> >>> Tom > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio > >
-- View this message in context: http://old.nabble.com/OFMD-Known-Symbols-tp28935966p28936423.html Sent from the GnuRadio mailing list archive at Nabble.com. _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
