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?
ofdm_v1_rx.png
ofdm_v1_tx.png