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Message-ID: <1Ew2L2-1OyP4a0@fwd34.sul.t-online.de>
Date:  Mon, 09 Jan 2006 20:04:23 +0100 (MEZ)
Sender: os2-wireless_users-owner <os2-wireless_users-owner@2rosenthals.com>
Reply-To: os2-wireless_users@2rosenthals.com
From:  "Robert Lalla" <os2-wireless_users@2rosenthals.com>
To:  "os2-wireless_users@2rosenthals.com" <os2-wireless_users@2rosenthals.com>
Subject: [OS2Wireless] signal strength

On Fri, 06 Jan 2006 23:48:25 +0100, Christian Langanke wrote:

>the driver should report the signal strength within a certain value 
>range, according to the NDIS interface specs, from -200 to -10.

Yes, in the Microsoft NDIS specification is written that signal strength
should be typically between -10 and -200 dBm.

Today I did some theoretical calculations, basically combining 
Shannon's theorem and the Boltzmann formula for thermal noise:
The theoretical receive signal limit using ideal hardware and ideal 
modulation methods for transmitting 1Mbit/s over a 22MHz channel is 
-109.4dBm, for transmitting 54Mbit/s over a 22MHz channel is -88dBm. 
Actual 802.11g hardware is reaching -92..-95dBm for 1Mbit/s and 
-70..-75dBm for 54Mbit/s.



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