Re: [Discuss-gnuradio] gr-ieee 802.11 transceiver, Trouble with the received packets

[Bastian Bloessl]

Hi,

please keep the conversation on the list.

On 03/29/2017 05:43 AM, Cristian Rodríguez wrote:
> It is very bad. I was trying and trying these days and i can't receive
> all the samples. What do you think, is a enough processor frequency so i
> can get the samples?. In this moment i have a core I5-6200U and 12Gb RAM.
> 
> I'm very worried about it, because i did a lot of proofs, even an
> overclocking and it didn't work. Then i think i'll have to get other
> processor.

I doubt that CPU performance is your actual problem. I would recommend
to make sure that frame detection is working. You might just have a DC
offset and the receiver triggers frame detection all the time. This
would overload any PC.

If everything works as it is supposed to and the PC is really to slow,
see for some tips here:
https://www.wime-project.net/installation/

If you ran volk_profile and really nothing works, only then I would try
another PC.

Best,
Bastian



> 
> What can you advice me?.
> 
> Thanks in advance.
> 
> Best regards,
> 
> Cristian
> 
> 2017-03-27 0:00 GMT-05:00 Bastian Bloessl <address@hidden
> <mailto:address@hidden>>:
> 
>     Hi,
> 
>     On 03/26/2017 09:44 PM, Cristian Rodríguez wrote:
>     > When it started i do:
>     >
>     > 1. In the flowgraph I'm in the freq 178 | 5.89 Mhz | 11p with sample
>     > rate=10MHz
>     > . It is shown in the terminal
> 
>     You should use Wireshark (on both sides) to check whether the frames
>     look as expected. From the ASCII debug output it is hard to tell what
>     kind of frame that is.
> 
>     Also the 'O's indicate that the PC cannot keep up with the sample stream
>     and drops packets.
> 
> 
>     >
>     > 2. I open another terminal and i try to do a ssh port and i receive it
>     > (in the second terminal):
> 
>     I assume the other side of the connection is a PC with a normal WiFi
>     card. Make sure to adapt the ARP entries to match the MAC of the card.
>     The WiFi card also needs static ARP entries for the SDR.
> 
> 
>     > NOTES:
>     > It is courious that i get 0000 when the transceiver is not receiving
>     > anything.
> 
>     This means your PC is not fast enough to process the incoming samples.
>     Either it is too slow, or frame detection is triggered too often due to
>     a DC offset, for example.
> 
> 
> 
>     Best,
>     Bastian
> 
>