There is no getting away from the fact that the health crisis brought by Covid-19 and the forced confinement of the majority of the world’s population has allowed teleworking to become a new way in which to engage with employers.
Today, all machines need to communicate with each other. The fact that they are heavier than other technologies is the reason why the Internet has become so fundamental in our everyday lives. This would never have been possible, however, without wireless communication, that is, devices capable of connecting to each other using electromagnetic waves in the air.
Following on from a previous article on DSL and its scientific bases, I now want to review the fundamentals of another technology: radio. As with a DSL, the ability to transmit data in any radio communications system – from the very first Marconi experiments to 5G networks – is bound by Shannon’s equation, based on the channel’s bandwidth and signal-to-noise ratio. In radio, we also have another interesting equation that can tell us the received signal strength when the transmitter power and frequency, antenna characteristics and distance to the receiver are known.