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

[Uher, Jason J.]

This might be a silly question, but are your gain settings correct?

These two facts make me think you may be saturating the receiver and not experience sample flow issues:

1)      You’re not seeing under/overflows on the output (I assume, or you probably would have mentioned it)

2)      You *are* seeing correctly demoded packets, just from far away

 

Are you able to turn debug on and check that the packets are being received in the linear area of the PA and ADC?

 

 

 

From: Discuss-gnuradio [mailto:discuss-gnuradio-bounces+address@hidden On Behalf Of Diez Victor
Sent: Thursday, May 25, 2017 12:12 PM
To: Qurat-Ul-Ann Akbar; GNURadio Discussion List
Subject: Re: [Discuss-gnuradio] IEEE 802.11 receiver not working for high sampling rates

 

The problem could be the transmission of data via ethernet port.

Are you working under virtualized OS conditions? These could be the origin of your problem, virtualized ethernet ports don’t reach enough high data rates.

Another possibility could be that your ethernet adapter isn’t a gigabyte ethernet adapter.

Finally, if you work with Matlab/Simulink, you can have the same problem. In this case I recommend you to change to GNU-Radio and its flowchart interface, GRC.

 

 

 

De: Discuss-gnuradio [mailto:discuss-gnuradio-bounces+address@hidden] En nombre de Qurat-Ul-Ann Akbar
Enviado el: jueves, 25 de mayo de 2017 17:44
Para: GNURadio Discussion List
Asunto: [Discuss-gnuradio] IEEE 802.11 receiver not working for high sampling rates

 

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.