How does cosmic background radiation contribute to communication noise?
Consider a simple telephone conversation: A person (message source) speaks into a telephone receiver (encoder), which converts the sound of the spoken word into an electrical signal. This electrical signal is then transmitted over telephone lines (channel) subject to interference (noise). When the signal reaches the telephone receiver (decoder) at the other end of the line it is converted back into vocal sounds. Finally, the recipient (message receiver) hears the original message.
In the context of information theory, cosmic background radiation acts as a source of background noise that affects communication systems.1
Because this radiation is a homogeneous, omnipresent remnant from the early universe, it functions as an inescapable feature of the environment that can interfere with signal transmission. In communication engineering, such noise must be accounted for when determining the physical limits of data transmission. Claude Shannon’s foundational work in information theory provides the mathematical framework to calculate the minimum energy costs required to successfully transmit a bit of information through such noisy channels.12
While engineers can work to minimize noise generated by internal electrical circuits, cosmic background radiation represents a persistent, external source of interference that cannot be eliminated, necessitating robust signal processing strategies to maintain communication integrity.1