GreekIslandGirl wrote:So, the signal diminishes through distance because of noise?
Imagine you are speaking to someone. The further away they are the harder it is to hear you and they may end up having to say, sorry please repeat that (that's your data rate dropping as it takes more time to relate given amount of info). Then imagine someone drilling near by. When the person is near you the noise of the drill does not overcome your talking. As you move further from them the noise of the drill has more effect in terms of making you harder to hear.
Distance reduces the received signal strength thus the signal to noise ratio also decreases, even with a constant level of noise. It's the ratio of the TWO things that defines how much information peer second can be sent