802.11b/g Tx Power - RF Cafe Forums

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scylding

Post subject: 802.11b/g Tx Power

Posted: Thu Aug 23, 2007 4:56 pm

Lieutenant

Joined: Thu Aug 23, 2007 4:27 pm

Posts: 2

Location: Wichita KS

I was of the understanding that a wireless b/g card will initially transmit at full power (100mW) when initiating a link with an access point and then back off stepwise to the minimum power required for the link. I.e., if the signal was good and clean between AP and card, both parties would sense this and step down their Tx power to something quite a bit lower than 100mW.

I've done some searching, but I can't find anything explaining such a physical layer mechanism for b/g.

Am I mistaken?

Thanks in advance.

nubbage

Post subject:

Posted: Mon Sep 10, 2007 8:52 am

General

Joined: Fri Feb 17, 2006 12:07 pm

Posts: 304

Location: London UK

The lowest level I have seen reference to is 1 mW

However, I know not what the other steps might be.

A wild guess: 10dB

scylding

Post subject:

Posted: Mon Sep 10, 2007 9:07 am

Lieutenant

Joined: Thu Aug 23, 2007 4:27 pm

Posts: 2

Location: Wichita KS

Thanks for your help. It seems that there is no tx power control in b/g other than what is set by the user through the device driver.

Roi

Post subject:

Posted: Sat Sep 27, 2008 2:30 pm

Lieutenant

Joined: Sat Sep 27, 2008 2:07 pm

Posts: 1

The 802.11 spec has many chapters. Some deal with TX power control mechanisms. If I recall correctly the 11k or 11h have what you look for.

Posted 11/12/2012


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