Re: [Discuss-gnuradio] gr-ieee802_11 not able to send or receive packets.

[Bastian Bloessl]

Hi,

On 03/28/2017 06:43 PM, Anshul Thakur wrote:
> With this, two parts work independently: 
> - I am able to Rx packets from Wifi using wifi_rx.py (however, it works
> best only when I use it from the shell script provided. That is strange!).
> - I am able to Tx packets from SDR which are detected by a Wifi card in
> monitor mode.

Great.

> 
> However, When one SDR transmits and the other is receiving, I am not
> able to receive the packets sent by the SDR. 
> - I tried it using wifi_rx shell script on one, and wifi_tx.py on the
> other. PDUs from other Wifi Devices are detected.
> - I also tried putting a direct line between the Tx of one SDR to Rx of
> the other. Still no reception.

I think you should try to find out where things go wrong. Are frames
detected? Is frame detection triggered all the time? Does the receiver
sync on the frames (i.e., looks the constellation diagram somehow OK)?
etc., etc.

Maybe the BladeRF also has some calibration routines for TX DC offset
(which, I think, could make things worse for the receiver with line of
sight).

You could also test different RX/TX gains and parameters for the padding
block (I don't have a BladeRF, so I have no experience). Also assert
that there are no overruns or underruns.

Best,
Bastian