Detailed Information on 802.11n Protocol Stack

Asked by Hendrik on 2009-07-13

Hi,
i am just running the Experiment 7: IEEE 802.11 DraftN and keep asking myself some questions and hope you can shed some light...

You suggested a 3x3 MIMO configuration. Is there a reason for or can this configuration extended to 4x4?

Is it possible to apply a dynamic/time variant channel model or one of the six channel models (A - F) proposed by TGn?
I found something about (static) creating a wall and setting up the pathloss, but no dynamics...

Thanks for your great work!

Cheers
Hendrik

Question information

Language:
English Edit question
Status:
Answered
For:
openWNS-Application Edit question
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Last query:
2009-07-13
Last reply:
2009-07-20

Hi,

I'm afraid you will have to wait for Sebastian Max to come back from
vacation by the end of July to answer you your question.

Greats,

Mac Muehleisen

Hendrik wrote:
> New question #76846 on openWNS-Application:
> https://answers.launchpad.net/openwns-application/+question/76846
>
> Hi,
> i am just running the Experiment 7: IEEE 802.11 DraftN and keep asking myself some questions and hope you can shed some light...
>
> You suggested a 3x3 MIMO configuration. Is there a reason for or can this configuration extended to 4x4?
>
> Is it possible to apply a dynamic/time variant channel model or one of the six channel models (A - F) proposed by TGn?
> I found something about (static) creating a wall and setting up the pathloss, but no dynamics...
>
> Thanks for your great work!
>
> Cheers
> Hendrik
>
>

Sebastian Max (smx-comnets) said : #2

Dear Hendrik,

Considering the MIMO antenna configuration: The 3x3 is of course just a suggestion. In fact, the MIMO-enabled rate adaptation tries to optimize the number of streams, given the number of tx and rx antennas. Hence, it might happen that although 3x3 is available, only 1 stream is used (which allows reception diversity and thus an SNR gain). You can configure any number of antennas for any device.

Currently, there is no dynamic/time variant channel implementation, apart from the possibility to configure a time-dependent fading channel; Especially, there is no implementation of a channel model according to TGn.

BR,
Sebastian

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