Carrier-to-receiver noise density

Okay, so imagine you have a toy car and a toy garage. The car represents the signal that is being transmitted and the garage represents the receiving device. When the car drives into the garage, it makes a sound - this is the signal that the receiving device picks up.

Now, imagine there are other toys in the room making noise, like a toy train or a musical toy. These other toys represent noise that can interfere with the signal from the toy car that is trying to get into the garage.

The carrier-to-receiver noise density is like a measurement of how loud the other toys are compared to the signal from the toy car. The louder the other toys are, the harder it is for the signal from the toy car to be heard by the receiving device.

So, when engineers are designing communication systems, they need to think about how to lower the noise level so that the signal can be heard clearly. They measure the carrier-to-receiver noise density in order to figure out how much noise is present and how to minimize it.

In the end, it's like trying to listen to someone in a noisy room. If there are a lot of people talking loudly, it's hard to hear the one person you need to listen to. Similarly, if there is a lot of noise around a signal, it's hard for the receiving device to pick up the signal clearly.