From: Simon Barber <simon-vp0mx6+5gkqFX2APIN6yfw@public.gmane.org>
To: radiotap-sUITvd46vNxg9hUCZPvPmw@public.gmane.org,
wojciech.dubowik-ASv44eHyqLVBDgjK7y7TUQ@public.gmane.org
Subject: MCS field - STBC and Ness
Date: Thu, 10 May 2012 17:31:28 -0700 [thread overview]
Message-ID: <4FAC5DE0.90708@superduper.net> (raw)
Hi all,
I am writing a Wireshark extension to visualise 802.11 frames on a
timeline. In order to do this I need to be able to calculate the
duration from start of TX to end of TX for each frame.
For 802.11n I need to know the number of HT-DLTF and HT-ELTF training
symbols that are sent in the header - I have everything else needed to
calculate the duration. Given the MCS and the STBC and the Ness (Number
of extension spatial streams) I can calculate the number of training
symbols.
Both STBC and Ness are encoded in the HT-SIG transmitted at the start of
each HT frame.
The current proposal (or has it not yet been accepted?) for STBC
allocates just 1 bit - but the STBC field can have values or 0, 1 or 2.
Ness can be 0-3, so the remaining 2 bits could be allocated to Ness, but
this does not solve the problem of how to encode the modes with 2
spatial streams and 2 additional streams for STBC.
Does anyone know what current hardware supports - STBC values or 0,1,2?
Ness values of 0-3?
Any suggestions for how to convey these
Simon
next reply other threads:[~2012-05-11 0:31 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-11 0:31 Simon Barber [this message]
[not found] ` <4FAC5DE0.90708-vp0mx6+5gkqFX2APIN6yfw@public.gmane.org>
2012-05-11 7:04 ` MCS field - STBC and Ness Wojciech Dubowik
[not found] ` <4FACBA13.9040509-ASv44eHyqLVBDgjK7y7TUQ@public.gmane.org>
2012-05-11 16:44 ` Simon Barber
[not found] ` <4FAD41E4.3090803-vp0mx6+5gkqFX2APIN6yfw@public.gmane.org>
2012-05-11 16:53 ` Simon Barber
[not found] ` <4FAD43F0.20807-vp0mx6+5gkqFX2APIN6yfw@public.gmane.org>
2012-05-11 18:35 ` Johannes Berg
[not found] ` <1336761346.8739.3.camel-8upI4CBIZJIJvtFkdXX2HixXY32XiHfO@public.gmane.org>
2012-05-12 4:27 ` Simon Barber
[not found] ` <4FADE69F.9040100-vp0mx6+5gkqFX2APIN6yfw@public.gmane.org>
2012-07-05 9:12 ` Johannes Berg
[not found] ` <1341479550.4455.36.camel-8upI4CBIZJIJvtFkdXX2HixXY32XiHfO@public.gmane.org>
2012-11-01 0:22 ` Simon Barber
[not found] ` <5091C0BC.4040305-vp0mx6+5gkqFX2APIN6yfw@public.gmane.org>
2012-11-02 0:24 ` Simon Barber
[not found] ` <509312DB.7070100-vp0mx6+5gkqFX2APIN6yfw@public.gmane.org>
2012-11-05 14:35 ` Johannes Berg
2012-11-17 6:32 ` Standardisation - adding 2 bit STBC and Ness to MCS Simon Barber
2012-07-04 17:06 ` MCS field - STBC and Ness David Young
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