Re: [Discuss-gnuradio] OFDM Updates

[adib_sairi]

hi,
i would like to try the OFDM example but i cannot find the
benchmark_ofdm_tx.py and benchmark_ofdm_rx.py file in
/gnuradio-example/python/digital. did i search it in the wrong place or did
the file being remove from the gnuradio-3.1.3.tar ? 



trondeau wrote:
> 
> 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
> 
> 
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> 

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