From: <bogus@does.not.exist.com>
To: ath9k-devel@lists.ath9k.org
Subject: No subject
Date: Sun, 19 Dec 2010 23:59:03 -0000 [thread overview]
Message-ID: <mailman.2.1297934885.6166.ath9k-devel@lists.ath9k.org> (raw)
<br>
* If your RX chainmask has >1 radio enabled, you'll always be doing<=
br>
receive-side "diversity" (which is really "combining" (=
MRC) if I<br>
understand the technology correctly on multi-radio atheros 11n cards);<br>
* If your TX chainmask has >1 radio enabled and the TX descriptor has<br=
>
the relevant chainmask bits set, you should be transmitting on both<br>
antennas regardless of the rate. I honestly haven't verified it (I'=
ve<br>
only verified that behaviour for transmitting legacy rates out of the<br>
11n chips);<br>
<br>
* For rates < MCS8 (and legacy rates) there's further TX-side tricke=
ry<br>
that can be going on which I'm not too up-to-date on. For example,<br>
some (all?) of the 11n chips allow you to optionally transmit MCS0-7<br>
using STBC. But iirc, STBC is only enabled for 1-stream TX.<br>
<br>
In short, if you've got all the radios enabled =C2=A0for RX and ath9k i=
s<br>
enabling both/all radio chains when TX'ing, I think the answer is<br>
"yes" for you. :)<br>
<br>
Adrian<br>
<br>
On 16 February 2011 22:47, Baldomero Coll <<a href=3D"mailto:baldo.ath9k=
@gmail.com">baldo.ath9k at gmail.com</a>> wrote:<br>
> I'm not sure, but I've read somewhere that by default the two =
antennas are<br>
> used.<br>
> It is true that I'm not interested in selecting the number of ante=
nnas, what<br>
> I really want is that the MIMO capability is exploited if I'm usin=
g 802.11n<br>
> HT IBSS operation mode.<br>
> Can someone confirm that by default the two antennas (spatial diversit=
y) are<br>
> being used when we create the HT IBSS network?<br>
><br>
> 2011/2/16 Mohammed Shafi <<a href=3D"mailto:shafi.ath9k@gmail.com">=
shafi.ath9k at gmail.com</a>><br>
>><br>
>> On Tue, Feb 15, 2011 at 2:35 PM, Baldomero Coll <<a href=3D"mai=
lto:baldo.ath9k@gmail.com">baldo.ath9k at gmail.com</a>><br>
>> wrote:<br>
>> > Hello,<br>
>> ><br>
>> > Can you please tell me how do you select one o two antennas?<=
br>
>><br>
>> I don't know why you should do that. I guess changing the tx/r=
x<br>
>> chainmask will do after it was read from eeprom.<br>
>><br>
>> ><br>
>> > I'm using a similar setting than you:<br>
>> > Linux kernel: 2.6.32-28-generic-pae.<br>
>> > Driver: compat-wireless-2011-01-17 and iw-0.9.21 with the pat=
ch<br>
>> > suggested by<br>
>> > Alex.<br>
>> > Radio card: Ubiquiti SR71x<br>
>> ><br>
>> > Thanks in advance,<br>
>> > Baldomero<br>
>> >><br>
>> >> Hi all,<br>
>> >><br>
>> >> I would like to confirm my findings. My test platform con=
figurations<br>
>> >> are<br>
>> >> follow.<br>
>> >> Board: pcengine alix3d2<br>
>> >> Linux kernel: 2.6.35 from linux-wireless git<br>
>> >> Driver: compat-wireless-2011-01-17 and iw-0.9.21 with the=
patch<br>
>> >> suggested by Alex.<br>
>> >> Radio card: Ubiqiti SR71a on channel 36 with HT40+<br>
>> >> Measurement tool and settings: Iperf, UDP, 100Mb offered =
load<br>
>> >><br>
>> >> Recored throughput: 50-54Mbps (one antenna); 78-80Mbps (t=
wo or three<br>
>> >> antennas).<br>
>> ><br>
>> ><br>
>> > _______________________________________________<br>
>> > ath9k-devel mailing list<br>
>> > <a href=3D"mailto:ath9k-devel@lists.ath9k.org">ath9k-devel at li=
sts.ath9k.org</a><br>
>> > <a href=3D"https://lists.ath9k.org/mailman/listinfo/ath9k-dev=
el" target=3D"_blank">https://lists.ath9k.org/mailman/listinfo/ath9k-devel<=
/a><br>
>> ><br>
>> ><br>
><br>
><br>
> _______________________________________________<br>
> ath9k-devel mailing list<br>
> <a href=3D"mailto:ath9k-devel@lists.ath9k.org">ath9k-devel at lists.ath9k=
.org</a><br>
> <a href=3D"https://lists.ath9k.org/mailman/listinfo/ath9k-devel" targe=
t=3D"_blank">https://lists.ath9k.org/mailman/listinfo/ath9k-devel</a><br>
><br>
><br>
</blockquote></div><br>
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