Hi Tom, Would you mind release your modified code for me as reference first? Thanks
Chin-Ya ----- Original Message ----- From: Tom Rondeau <[EMAIL PROTECTED]> Date: Wednesday, March 26, 2008 9:50 am Subject: Re: [Discuss-gnuradio] OFDM Updates To: CHIN-YA HUANG <[EMAIL PROTECTED]> Cc: [email protected] > CHIN-YA HUANG wrote: > > Hello Tom, > > > > Based on your information below I know the problem will be receiver. > However, if I want to solve the receiver's problem. Where is the > starting point you suggestion? From the gnu-radio core part? > > > > > > Chin-Ya > > > > This problem will be fixed once I get time to merge my current branch, > > which will be in a few days, hopefully. > > Tom > > > > From: Tom Rondeau > > Subject: [Discuss-gnuradio] OFDM Updates > > Date: Thu, 07 Feb 2008 14:09:58 +0000 > > User-agent: Thunderbird 2.0.0.9 (Windows/20071031) > > For anyone working with the OFDM code, my latest check-in to the > trunk fixes some of the main issues of transmitting over the air. > Using benchmark_ofdm_rx and benchmark_ofdm_tx on different machines, I > am now able to successfully capture most packets with any modulation > at the appropriate signal level. > > > > I say most packets because there is still an issue involved in the > receiver where the regenerator signal pops up before the peak detector > signal resets it and causes a problem in the packet sampler. To see > what I mean, run > > "benchmark_ofdm.py --log" > > > > And look at the output of the regen and peak detector blocks: > > gr_plot_char.py ofdm_sync_pn-regen_b.dat ofdm_sync_pn-peaks_b.dat > > > > > > This will plot a series of 0's with a few 1's, where the peaks > occur. The peak detector sends it out once, and then the regenerator > takes over. For every packet, there is one output of the peak > detector. If you look, sometimes the peak detector will hit just after > a regenerated signal. By this point, it's too late and the > ofdm_sampler has already triggered off of the regen signal and ignores > the peak. > > > > It's a bit of a hassle, but I'll look into it soon. Any help is > appreciated, though :) > > > > Tom > > > > > _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
