Re: [Discuss-gnuradio] How to define maximum number of samples in in Sync_Short used in IEEE802.11

[Bastian Bloessl]

Hi,

the sync short blocks doesn't know how long the frame is. It just
recognized that there is one. Since it doesn't know the length, it
forwards samples corresponding to a "large" frame into the flow graph.
If the frame is shorter, needless samples are dropped at a later stage.

IIRC, the actual maximum frame size allowed by the standard is above
2000 byte. I set max samples so that a 1500 byte BPSK1/2 frame can still
be decoded, i.e., such a frame should have around 540 OFDM symbols with
80 samples each.

Best,
Bastian

On 8/22/19 9:08 AM, SG wrote:
> Hi,
> 
> I have been trying to run WiFi receiver on my SDR using GNURadio based
> approach developed by Bastian in gr-ieee802-11.  However, I am not able
> to figure out the reason behind definition of Max_Samples=540*80 in
> sync_short.cc file.
> 
> Could anyone help clarifying this to me.
> 
> Thanks and Regards
> 
> SG
> 
> 
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-- 
Dr. Bastian Bloessl
Secure Mobile Networking Lab (SEEMOO)
TU Darmstadt, Germany

www.bastibl.net
GitHub/Twitter: @bastibl

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