libertas-dev-bounces@xxxxxxxxxxxxxxxxxxx wrote on 03/19/2008 11:50:53 AM: > > RSSI can be derived by adding Noise Floor to SNR value > > I saw that, and it's actually like this coded. However, I was > wondering if it is allowed to add "dBm" to "dB". Those are the > documented units for "noisefloor" and "SNR", respectively. > Yes, you can add dB to dBm and you will end up with dBm 0 dBm = 1mW So the Noise Floor is given as an absolute value (dBm) and adding the SNR to it ( just a ratio in dB) will tell you what the Signal level is (in dBm) If the noise floor is reported as -86dBm, that means that the received noise power is about 2.5pW. An SNR of 36 means that the received signal power is -86dbm + 36dB = -50dbm ( i.e. 2^12 times higher - 10nW) Wikipedia has a nice article explaining that: http://en.wikipedia.org/wiki/DBm M. -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
