Comments on: Transmit beamforming

By: Jeremy Millener

Jeremy Millener — Wed, 02 Jun 2010 03:54:39 +0000

, thank you for this latest information. Therefore, I would like to ask for your allowance to add some of this information in my blog. Of course, I will provide a link to your website, as a source of my mentioned information.

By: Rajiv Iyer

Rajiv Iyer — Thu, 21 Jan 2010 17:57:26 +0000

Thanks for the follow up. Much appreciated.

Rajiv

By: Paul DeBeasi

Paul DeBeasi — Wed, 20 Jan 2010 13:22:12 +0000

Hi Rajiv,

I checked with Cisco, and you are correct. The Cisco Transmit Beamforming technology (Client Link) does not provide any benefits for 802.11b stations. Cisco is using some of the advanced 802.11n signal processing data to drive ClientLink. It is only computed for the 802.11a/g signals that use OFDM modulation, not the older CCK modulation used by 802.11b.

Thanks for your comment!
Paul

By: Paul DeBeasi

Paul DeBeasi — Mon, 18 Jan 2010 20:22:30 +0000

Hi Rajiv,

Although the documentation specifically states “802.11 g/a”, my understanding is that ClientLink also works with 802.11b stations. I am checking with Cisco on this and will post an update.

Thanks for your comment!
Paul

By: Rajiv Iyer

Rajiv Iyer — Mon, 18 Jan 2010 20:04:29 +0000

Nice article on Tx Beamforming. I noticed a small error. According to Cisco documentation, ClientLink does not work for 802.11b. I am not quite sure why this technology is limited to OFDM modulation.

You mention…

“Cisco has introduced a proprietary form of TxBF called ClientLink. ClientLink can work with 802.11b/g/a STAs because it requires no modifications in the STA.”

Cisco mentions…

Source: http://www.cisco.com/en/US/prod/collateral/wireless/ps5678/ps10092/white_paper_c11-516389.html

“And because it doesn’t require any special feedback, Cisco ClientLink works with all existing 802.11a/g clients .”