Thanks for responding. No, everything is from the master branch, other than I split the ofdm_loopback script into tx and rx scripts but the blocks went unchanged.
Jon On Sat, Apr 26, 2014 at 12:10 PM, Martin Braun <[email protected]>wrote: > On 04/21/2014 09:02 PM, Jonathan Fox wrote: > > Hey list, another OFDM question. > > > > I have this simple OFDM script I have used before and in between USRPs I > > have VHF handheld radio I am using as an interferer (also have plenty of > > attenuation, between USRPs it is about 30 dB and the handset is > > attenuated by 55 dB). So with interefering signal around -23 dBm in > > between the the transmission 80 kHz channel which is at -32 dbm as > > according to my handheld Spectrum Analyzer, GNU Radio's FFT plot on the > > RX side gives a transmission of -90 dB and an interference at -50 dB. > > > > Whenever the handheld goes off, the receiver predictably loses the > > transmitted message and freezes up or the scope goes blank. Depending on > > the duration of the interference of the handheld (just a simple click of > > the tx) usually causes the receiver to lock up and not receive/never > > recover transmitted comms again. > > > > So why does the RX never recover and how can this be mitigated? I am > > still learning OFDM so I am thinking this is related to the channel > > estimator, is my line of thinking correct? > > The channel estimator holds no state, so I doubt that's the problem. Are > you working off of master? > > Martin > > > _______________________________________________ > Discuss-gnuradio mailing list > [email protected] > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >
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