RadioTap Archive on lore.kernel.org
 help / color / Atom feed
From: Johannes Berg <johannes-cdvu00un1VgdHxzADdlk8Q@public.gmane.org>
To: "radiotap-sUITvd46vNxg9hUCZPvPmw@public.gmane.org"
	<radiotap-sUITvd46vNxg9hUCZPvPmw@public.gmane.org>
Subject: multi-antenna handling
Date: Mon, 20 Aug 2012 18:50:25 +0200
Message-ID: <1345481425.4459.46.camel@jlt3.sipsolutions.net> (raw)

Hi,

This isn't really a proposal for a field definition, but more a usage
clarification that I'm seeking.

When we have multiple RX chains, it is often useful to know how much
power was received by each chain, and which chain(s) a frame was
received on.

Today, many drivers give the maximum power over all chains as a single
value, and some drivers give no antenna information while other drivers
(ab)use the (unitless) antenna index field (bit 11) as an antenna
bitmap.


I'm planning to modify this (in Linux) to include, where available,
antenna index & per-antenna signal information by duplicating the
radiotap namespace for each antenna, so that the header would, for
example, read as follows for a 3x3 devices:

 * ... TSF, Flags, Rate, Channel, ...
 * antenna signal: -40 dBm
 * antenna: 0
 * ... MCS, A-MPDU status, ...
 * antenna signal: -45 dBm
 * antenna: 1
 * antenna signal: -43 dBm
 * antenna: 2


Does this seem like sane behaviour? If so, do you think it would be
worthwhile describing it somewhere on the wiki?

johannes

             reply index

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-08-20 16:50 Johannes Berg [this message]
     [not found] ` <1345481425.4459.46.camel-8upI4CBIZJIJvtFkdXX2HixXY32XiHfO@public.gmane.org>
2013-07-08  8:59   ` Johannes Berg
     [not found]     ` <1373273952.8312.7.camel-8Nb76shvtaUJvtFkdXX2HixXY32XiHfO@public.gmane.org>
2014-06-25  1:53       ` Guy Harris
     [not found]         ` <C7AC152F-CCC4-48E7-B752-71655EFD0C58-FrUbXkNCsVf2fBVCVOL8/A@public.gmane.org>
2014-06-25  7:04           ` Johannes Berg
     [not found]             ` <1403679889.4140.2.camel-8Nb76shvtaUJvtFkdXX2HixXY32XiHfO@public.gmane.org>
2014-06-25 13:09               ` Matteo Cypriani
     [not found]                 ` <20140625090901.fa121a689f823f3af1db1e3a-yxGd9NVxpOI@public.gmane.org>
2014-06-25 15:11                   ` Johannes Berg
     [not found]                     ` <1403709105.4140.13.camel-8Nb76shvtaUJvtFkdXX2HixXY32XiHfO@public.gmane.org>
2014-06-26  2:07                       ` Guy Harris
     [not found]                         ` <636CB894-79D9-4CC3-B820-833761A9666D-FrUbXkNCsVf2fBVCVOL8/A@public.gmane.org>
2014-06-26  6:20                           ` Johannes Berg
     [not found]                             ` <1403763600.4131.3.camel-8Nb76shvtaUJvtFkdXX2HixXY32XiHfO@public.gmane.org>
2014-06-26  8:24                               ` Felix Fietkau
2018-12-30 21:47                               ` "Overall" and per-chain signal/noise values (was Re: multi-antenna handling) Guy Harris
     [not found]                                 ` <0836AF8F-37B1-4E52-B14C-7D7B31D4C5E8-FrUbXkNCsVf2fBVCVOL8/A@public.gmane.org>
2019-01-15 13:19                                   ` Johannes Berg

Reply instructions:

You may reply publically to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=1345481425.4459.46.camel@jlt3.sipsolutions.net \
    --to=johannes-cdvu00un1vgdhxzaddlk8q@public.gmane.org \
    --cc=radiotap-sUITvd46vNxg9hUCZPvPmw@public.gmane.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

RadioTap Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/radiotap/0 radiotap/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 radiotap radiotap/ https://lore.kernel.org/radiotap \
		radiotap@radiotap.org
	public-inbox-index radiotap

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.netbsd.radiotap


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git