I have been trying to think of a simple example. The only one that comes to mind right now is listening to weak FM broadcast signal. If the station was transmitting a pure tone, you could pick out the tone from the static on a very weak station, but if that same weak station switched from transmitting a tone to some classical music, it would be almost totally lost in the noise. In order for you to get the content of the music, the signal would have to be much stronger. The pure tone contains zero information. The music contains lots of information. You need more power to get more information through the noise.
Does that make any sense? ----- Original Message ----- From: "Chuck McCown - 2" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]>; "WISPA General List" <wireless@wispa.org> Sent: Monday, June 16, 2008 9:14 PM Subject: Re: [WISPA] modulation question > RSSI, strictly speaking, is the received signal strength. (Received > Signal > Strength Indicator) The signal can be totally unmodulated or modulated in > a > very complex method with the same RSSI. I am wondering if what you are > asking is about the minimum RSSI needed. Generally speaking, the more > complex the modulation, the more received signal you need for a given > error > rate. > > > ----- Original Message ----- > From: "Rogelio" <[EMAIL PROTECTED]> > To: "WISPA General List" <wireless@wispa.org> > Sent: Monday, June 16, 2008 9:06 PM > Subject: [WISPA] modulation question > > >> I've got a question, which I'm afraid might be a little stupid to some, >> particularly those with RF backgrounds... >> >> I've always thought that modulation rate was directly tied to RSSI (for >> some law of physics reason or something), but someone else told me that >> it's not like that (in theory) and what I'm seeing is just certain >> vendors do that for a particular purpose. >> >> What is this purpose? >> >> >> -------------------------------------------------------------------------------- >> WISPA Wants You! Join today! >> http://signup.wispa.org/ >> -------------------------------------------------------------------------------- >> >> WISPA Wireless List: wireless@wispa.org >> >> Subscribe/Unsubscribe: >> http://lists.wispa.org/mailman/listinfo/wireless >> >> Archives: http://lists.wispa.org/pipermail/wireless/ >> > > > > -------------------------------------------------------------------------------- > WISPA Wants You! Join today! > http://signup.wispa.org/ > -------------------------------------------------------------------------------- > > WISPA Wireless List: wireless@wispa.org > > Subscribe/Unsubscribe: > http://lists.wispa.org/mailman/listinfo/wireless > > Archives: http://lists.wispa.org/pipermail/wireless/ > -------------------------------------------------------------------------------- WISPA Wants You! Join today! http://signup.wispa.org/ -------------------------------------------------------------------------------- WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
