[Discuss-gnuradio] gr-ieee802_11 Transceiver

[serefay]

Dear all,

I am using Bastian Bloessl's gr-ieee802_11 OFDM Transceiver for my
Thesis. I have used the Rx to captured the WiFi frames and saved them in
a file and also Pcap file of them. Now I want to compare the frames that
I received with the Original ones in order to check the change in
transmitted signal. I wanted to use the frames I have captured and use
TX to receive the original frames possibly. My aim is to compare the
received one with the original signal in order to calculate EVM. Can
anyone please help me?  how should I use the wifi_tx.grc. How can I
connect the set up flow graph to transmit Data Bytes of a frame to the
transmitter in order to get the original data frame.Or is there any
better way to do that.

Any help would be appreciated.

Kind Regards

Seref



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Re: [Discuss-gnuradio] gr-ieee-802-11 Transceiver (was: gr-ieee802_11 Transceiver)

[serefay]

Hi Marcus,

thanks for your reply and valuable comment on EVM. My problem with TX is
that I do not know how to connect my File source with the Transmittter
block? Of course I can receive the transmitted data by connecting file sink
parallel to USRP sink as you said but if I save my data Bytes from Pcap file
as bin file and transmit those bytes into the transmitter so that i can save
it to a file sink but connecting to which block and input( eg. into block
WIFI HIER as Mac_in or as or sample_in). I tried to send as follow (
Filesource->stream_taggedStream->tagged-Stream to pdu->app_in ) from the MAC
Block but it puts my data bytes as payload so which cannot be decoded by
receiver again. I did not understand what you meant by

 "For correctly received packets, couldn't you just use the same
gr-ieee802-11 blocks to recreate the original packet in the receiver,
and then compare? "

How can I do , I don't have much idea about that. Could you please guide me
a bit.

many thanks

Seref



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[Discuss-gnuradio] gr-ieee802_11 receiver

[serefay]

Dear all,

I am using gr-ieee802_11 Transceiver to analyze wifi signals.
I receive samples and retransmit the same IQ samples wit Tx and save
them in file, but when I try to use that IQ samples from file to receive
them from file source some packets are not received, even though they
are successfully transmitted and in file. Can anyone please help me what
could be the problem? what can I do.

Best Regards

Seref



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Re: [Discuss-gnuradio] gr-ieee802_11 receiver

[serefay]

Hi Marcus,

thank your very much for your reply . In Pictures attached there are my
receiver and transmitter. So with HackRf I have received some wifi packets.
And in my transmitter I read the Pcap file which contains those wifi packets
that I received and sending them all to the transmitter to create them
without noise. And at the end I multiply it by 500ms for gain and saved the
regenerated packets into a file . Now In those pictures you see I use a file
source as receiver source. I read those packets that I recreated and want to
compare with the old original pcap. But some of the packets or not read It
does not happens always to the same packets so I think it is not that the
packets are not successfully created but why It can be? I don't understand
that. Am I missing something? or what can I do more. I appreciate your help. 

Thank your very much

Kind Regards
Seref

 
 



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Re: [Discuss-gnuradio] gr-ieee802_11 receiver

[serefay]

Hi ,

I am sorry I have send on nabble and did not know that willl add only as
thumbnails. I can send grc flow graph but i have changed the original codes
so without those cpp files will it work. I dont know but I can send the
whole project. I can also send whole files if have time to check it. I
would be grateful for your help

Thanks

Best Regards

2017-04-01 23:49 GMT+02:00 Cinaed Simson [via GnuRadio] <
ml-node+s4n63412...@n7.nabble.com>:

> On 04/01/2017 08:41 AM, serefay wrote:
>
> > Hi Marcus,
> >
> > thank your very much for your reply . In Pictures attached there are my
> > receiver and transmitter. So with HackRf I have received some wifi
> packets.
> > And in my transmitter I read the Pcap file which contains those wifi
> packets
> > that I received and sending them all to the transmitter to create them
> > without noise. And at the end I multiply it by 500ms for gain and saved
> the
> > regenerated packets into a file . Now In those pictures you see I use a
> file
> > source as receiver source. I read those packets that I recreated and
> want to
> > compare with the old original pcap. But some of the packets or not read
> It
> > does not happens always to the same packets so I think it is not that
> the
> > packets are not successfully created but why It can be? I don't
> understand
> > that. Am I missing something? or what can I do more. I appreciate your
> help.
> >
> > Thank your very much
> >
> > Kind Regards
> > Seref
> >
> > <http://gnuradio.4.n7.nabble.com/file/n63409/transmitter.png>
> > <http://gnuradio.4.n7.nabble.com/file/n63409/receiver.png>
>
> Have you looked at those images online?
>
> If you need help, try sending the XML based flowgraph instead of a
> binary image.
>
>
> >
> >
> > --
> > View this message in context: http://gnuradio.4.n7.nabble.
> com/gr-ieee802-11-receiver-tp63405p63409.html
> > Sent from the GnuRadio mailing list archive at Nabble.com.
> >
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gr-ieee802-11-next.zip (3M) 
<http://gnuradio.4.n7.nabble.com/attachment/63413/0/gr-ieee802-11-next.zip>




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[Discuss-gnuradio] gr-ieee802_11 receiver

[serefay]

Hello everyone,

I am using gr-ieee802_11 to regenerate wifi packets. I receive packets with
HackRf and regenerate the same packet with transmitter and now I want to
look whether they look the similar but  some packets are not received. I
enabled MAC decode debug and it gives this error when it misses the packet.
"
Decode MAC: input 53
Warning: starting to receive new frame before old frame was complete
Already copied 27 out of 30 symbols of last frame
"
can anyone please help me  and give me some  idea what could result this
error.? I would be grateful for any help.
Thanks

Best Regards 
Seref



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Re: [Discuss-gnuradio] gr-ieee802_11 receiver

[serefay]

Hi, 

Thanks for your reply. I could not find out how can I solve it. But this
problem comes only when I receive from a file source. Even tough  when send
the IQ samples that I captured with Hackrf, which i saved in a file, it
encounters the same problem.Is there any some blocks can be alternative to
file source to send the samples to the receiver?

thanks




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Re: [Discuss-gnuradio] gr-ieee802_11 receiver

[serefay]

Hi, 

thanks for quick reply. What I am trying to do is to regenerate noise-free
wifi frames, which I already captured with HackRf. So I m receiving wifi
samples with hack RF then and save both the samples and decoded  frames in
files. I use the decoded pcap file to regenerate the wifi frames. I send
each frame to the transmitter ( i changed the mac block accordingly) and
regenrate the same packets. The aim is to receive them without noise so that
i can compare with the samples with with the noise, which i received with
hackrf. I will then use that for my statistic. I want to measure the Error
Vector Magnitude and see the deviation of wifi samples when i receive them.
I don not know if I made my point clear but thanks for your help. 

So I saved the samples in a file but I tried to connect the transmitter and
receiver in WIFI HIer  block. it still miss some packets.  How can i
understand if my disk has bottleneck and can it be solved?

Thanks a lot 
Best regards



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[Discuss-gnuradio] Solved:Re: gr-ieee802_11 receiver

[serefay]

Hi all,

thanks to Bastian i have solved my problem. So the problem was due to zero
padding between regenerated frames as Bastian said :  "The padding shouldn't
be all zeros but contain a small amount
of noise. If you send an all-zeros stream of samples, the receiver will
constantly divide by zero, which leads to undeterministic behavior and
random frames get detected." .  So I have changed the zero padding
implementation and added some noise instead of having zeros and now the
receiver can decode all frames. 

Regards




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