From: Felix Fietkau <nbd@openwrt.org>
To: Rajkumar Manoharan <rmanohar@qca.qualcomm.com>
Cc: linville@tuxdriver.com, linux-wireless@vger.kernel.org
Subject: Re: [PATCH v3 11/13] ath9k_hw: Disable Walsh spatial spreading for 2 chains
Date: Thu, 04 Aug 2011 20:23:28 +0200 [thread overview]
Message-ID: <4E3AE3A0.2000308@openwrt.org> (raw)
In-Reply-To: <1312480447-27483-1-git-send-email-rmanohar@qca.qualcomm.com>
On 2011-08-04 7:54 PM, Rajkumar Manoharan wrote:
> The Walsh bit is disabled for regulatory consideration.
>
> As per the FCC rulings, only transmissions that are completely
> non-coherent, are allowed to waive the array gain contribution
> to EIRP for multi-transmit configurations. The use of 2-stream
> with 2 transmit and use of 3-steam with 3 transmit qualifies
> for this spatial multiplexing MIMO classification as long as
> the streams are directly mapped to each radio (not Walsh spread
> prior to splitting to multiple radios)
I think ath9k does not waive the array gain contribution. I haven't
checked AR9003, but on AR9002 and older, it explicitly includes the
array gain contribution in the tx power limit calculation. I'm not sure
that unconditionally disabling spatial spreading is the right way to
deal with this.
- Felix
next prev parent reply other threads:[~2011-08-04 18:23 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-04 17:54 [PATCH v3 11/13] ath9k_hw: Disable Walsh spatial spreading for 2 chains Rajkumar Manoharan
2011-08-04 18:23 ` Felix Fietkau [this message]
2011-08-05 2:54 ` Rajkumar Manoharan
2011-08-05 6:35 ` Adrian Chadd
2011-08-05 7:24 ` Rajkumar Manoharan
2011-08-05 8:36 ` Rajkumar Manoharan
2011-08-05 9:48 ` Felix Fietkau
2011-08-05 11:50 ` Adrian Chadd
Reply instructions:
You may reply publicly 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=4E3AE3A0.2000308@openwrt.org \
--to=nbd@openwrt.org \
--cc=linux-wireless@vger.kernel.org \
--cc=linville@tuxdriver.com \
--cc=rmanohar@qca.qualcomm.com \
/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
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).