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From: Simon Barber <simon-vp0mx6+5gkqFX2APIN6yfw@public.gmane.org>
To: Oleksij Rempel <linux-YEK0n+YFykbzxQdaRaTXBw@public.gmane.org>
Cc: radiotap-qavaossjCcEdnm+yROfE0A@public.gmane.org,
	johannes-cdvu00un1VgdHxzADdlk8Q@public.gmane.org,
	Adrian Chadd <adrian-h+KGxgPPiopAfugRpC6u6w@public.gmane.org>,
	"ath9k-devel-xDcbHBWguxHbcTqmT+pZeQ@public.gmane.org"
	<ath9k-devel-xDcbHBWguxHbcTqmT+pZeQ@public.gmane.org>,
	linux-wireless-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: Standardisation - adding 2 bit STBC and Ness to MCS
Date: Fri, 03 May 2013 14:12:22 -0700
Message-ID: <51842836.8090601@superduper.net> (raw)
In-Reply-To: <518127ED.9060900-YEK0n+YFykbzxQdaRaTXBw@public.gmane.org>

I did post example code as attachments to the suggested-fields page a 
few months ago. Click on 'attachments' to view them. There are 3:

1. Intel wlan driver patch
2. Kernel patch
3. Wireshark patch.

Simon


On 05/01/2013 07:34 AM, Oleksij Rempel wrote:
> Hallo all,
>
>
>> http://www.radiotap.org/suggested-fields/MCS%20extension%20for%20STBC%20and%20Ness
>>
>>
>> I have posted 3 patches on the proposal page (see Attachments):
>>
>> 1. A patch that applies to the Linux kernel v3.7-rc1 to collect the new
>> STBC and Ness parameters from a wireless driver, and add them into the
>> MCS radiotap field.
>> 2. A patch to the Intel wireless driver in the kernel to collect STBC
>> and Ness information.
>> 3. A patch to wireshark to display STBC and Ness information.
>>
>> With this I believe we have everything needed to start the 3 week
>> comment period.
>
> There is a bit more then 3 week now. I would like to have this approved :)
> Are there any thing needed to finish this?
>
> Beside, i have one question about how STBC work. According to differnet
> docs, i assume that:
> - STBC is done by sending, at least, two stream with same data in
> different order.
> - It means for me, that real use of STBC can be made only on MIMO hardware.
> - If 1x1 receiver indicates that it got STBC encoded frame, it dos not
> meant, it would be able to use redundant data from second stream.
> - There are fallowing STBC schemes: Alamouti’s
> STBC for 2 transmit antennas and orthogonal STBC for 3 and 4 transmit
> antennas.
>
> According to this information, what do we call 1,2 or 3 stream STBC?
> Since STBC should have minimal 2 stream, but in same time we have 1x1
> and 2x2 hardware which able to receive and decode STBC stream i assume:
>      - RX-STBC1 is for compatibility only. No data redundancy.
>      - RX-STBC12 - can be used Alamouti’s schema with 2 streams. Mostly
> used method.
>      - RX-STBC123 - is orthogonal schema and not widely used method.
> Since last method use wide spectrum to transmit data comparable to SISO
> stream, it makes almost no sense. But 3-stream method get optimal error
> corect in compare with 2 and 4 strea schemas.
>
> Do this assumptions correct?
>
> PS: My assumptions based on "MIMO Space-Time Block Coding (STBC):
> Simulations and Results"

  parent reply index

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <518127ED.9060900@rempel-privat.de>
     [not found] ` <1367527479.11375.19.camel@jlt4.sipsolutions.net>
     [not found]   ` <1367527479.11375.19.camel-8Nb76shvtaUJvtFkdXX2HixXY32XiHfO@public.gmane.org>
2013-05-03 19:53     ` Patches for STBC Standartisation Oleksij Rempel
2013-05-07  7:40     ` Standardisation - adding 2 bit STBC and Ness to MCS Oleksij Rempel
     [not found]   ` <1367610836-3303-1-git-send-email-linux@rempel-privat.de>
     [not found]     ` <1367610836-3303-1-git-send-email-linux-YEK0n+YFykbzxQdaRaTXBw@public.gmane.org>
2013-05-03 19:53       ` [PATCH 1/3] mac80211: add STBC flag for radiotap Oleksij Rempel
2013-05-03 19:53       ` [PATCH 2/3] ath9k: remove useless flag conversation Oleksij Rempel
2013-05-03 19:53       ` [PATCH 3/3] ath9k: check for Rx-STBC flag and pass it to ieee80211 Oleksij Rempel
2013-05-03 19:53       ` [PATCH] tcpdump: add STBC Rx support Oleksij Rempel
2013-05-04  6:22       ` Patch for radiotap library Oleksij Rempel
     [not found]     ` <1367610836-3303-5-git-send-email-linux@rempel-privat.de>
     [not found]       ` <1367610836-3303-5-git-send-email-linux-YEK0n+YFykbzxQdaRaTXBw@public.gmane.org>
2013-05-03 19:58         ` [PATCH] tcpdump: add STBC Rx support Guy Harris
     [not found]           ` <15EBD372-C4E3-4DA3-9ED9-47B238654587-FrUbXkNCsVf2fBVCVOL8/A@public.gmane.org>
2013-05-03 20:04             ` Oleksij Rempel
     [not found]   ` <5188AFFE.6070804@rempel-privat.de>
     [not found]     ` <5188AFFE.6070804-YEK0n+YFykbzxQdaRaTXBw@public.gmane.org>
2013-05-07 13:54       ` Standardisation - adding 2 bit STBC and Ness to MCS Johannes Berg
     [not found]     ` <1367934867.8328.31.camel@jlt4.sipsolutions.net>
     [not found]       ` <1367934867.8328.31.camel-8Nb76shvtaUJvtFkdXX2HixXY32XiHfO@public.gmane.org>
2013-05-07 13:55         ` Johannes Berg
     [not found]       ` <1367934904.8328.32.camel@jlt4.sipsolutions.net>
     [not found]         ` <1367934904.8328.32.camel-8Nb76shvtaUJvtFkdXX2HixXY32XiHfO@public.gmane.org>
2013-05-07 14:25           ` Oleksij Rempel
     [not found]         ` <518916D1.4070902@gmail.com>
     [not found]           ` <518916D1.4070902-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2013-05-07 15:03             ` Oleksij Rempel
     [not found]           ` <518917C4.9090607@rempel-privat.de>
     [not found]             ` <518917C4.9090607-YEK0n+YFykbzxQdaRaTXBw@public.gmane.org>
2013-05-07 16:09               ` Jonathan Bither
     [not found] ` <518127ED.9060900-YEK0n+YFykbzxQdaRaTXBw@public.gmane.org>
2013-05-02 20:44   ` Johannes Berg
2013-05-03 21:12   ` Simon Barber [this message]
2013-05-01 14:34 Oleksij Rempel
  -- strict thread matches above, loose matches on Subject: below --
2012-05-11  0:31 MCS field - STBC and Ness Simon Barber
2012-05-11  7:04 ` Wojciech Dubowik
2012-05-11 16:44   ` Simon Barber
2012-05-11 16:53     ` Simon Barber
2012-05-11 18:35       ` Johannes Berg
2012-05-12  4:27         ` Simon Barber
2012-07-05  9:12           ` Johannes Berg
2012-11-01  0:22             ` Simon Barber
2012-11-02  0:24               ` Simon Barber
     [not found]                 ` <509312DB.7070100-vp0mx6+5gkqFX2APIN6yfw@public.gmane.org>
2012-11-17  6:32                   ` Standardisation - adding 2 bit STBC and Ness to MCS Simon Barber

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