I have a TP-Link TL-WN951N wireless PCI device (AR5008) and trying to make it
work in 802.11n mode with HT and MIMO. According to specifications (
http://www.tp-link.com/products/productDetails.asp?class=&content=spe&pmodel=TL%2DWN951N
) device supports 3*3 MIMO but I'm unable to enable spatial streams because of
ath9k driver. I have Ubuntu 10.10 with latest hostapd (compiled from git and
configured to support 802.11n) and installed
"linux-backports-modules-compat-wireless-2.6.37-2.6.35-28-generic" package
(which is latest available). The output of "iw list" command prints next
capabilities:
Capabilities: 0x104e
HT20/HT40
SM Power Save disabled
RX HT40 SGI
No RX STBC
Max AMSDU length: 7935 bytes
DSSS/CCK HT40
So there is no TX and RX STBC available. Even if I provide this options to
hostapd like "[TX-STBC][RX-STBC123]" the program is not starting with error
message stating that Driver does not support this modes. I'm interesting, it's
possible to enable spatial stream multiplexing for my device? Is there any
patch for ath9k driver or device is really does not support STBC and the
information provided at TP-Links site is false?
Another problem is that when I enable HT40 mode I get connection speed 300Mbps
but connection quality and speed is awful. In HT20 mode I get real 150Mbps,
good connection and 5-6 mb/sec speed. I guess that the problem with HT40 is
linked to absense of STBC. Any thoughts?
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