Re: [Discuss-gnuradio] IEEE 802.11 receiver not working for high sampling rates

[Marcus Müller]

Hi,

well, the next step here would pretty clearly be going through the flow graph and finding out where things don't work – you'd typically start with something like a frequency or waterfall plot directly at the receiver, and then look for packet errors, and so on. Use a Qt time sink to look for clipping or too weak signals.

As we're not sitting in your lab, this might actually be pretty hard to do remotely; that's the thing about debugging: you basically have to do it till until you're experienced enough. We can only suggest things from afar, but I think in the other threads we've been discussing the most likely things already...

Best regards,

Marcus

On 25.05.2017 17:43, Qurat-Ul-Ann Akbar wrote:

Hi,

I am working with USRPs N210 and GNU Radio version 3.7. I wasn't able to work with higher sampling rate like 20 MHZ used in WiFi and that's why I bought a new workstation with better processor. However, the module still isn't working. The receiver isn't receiving anything at 20 MHZ if it's QAM 64 or BPSK . It works perfectly fine with 1 MHZ and receives all data from the transmitter USRP. But at 20 MHZ it receives a few WiFi packets from surrounding far off APs in the building but isn't receiving anything from the USRP transmitter in the room. It doesn't work for 10 MHZ as well. 

Can anyone tell me what could be the reason for that? I have tried changing LO offset etc. 

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