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.
Every day we hear more news on 5G, its progress and evolution, as the demand for connectivity between vehicles, towns and cities, devices and sensors continues to grow. As you might expect, the railway sector and it’s train communications are no less affected, being one of the main players anxiously awaiting these new developments to adapt the 5G technology and use in their area of railway intra and intercommunication.
Future deployments of 5G mobile telephone networks will bring large-scale small-cell roll-outs. A small cell is nothing more than a miniature base station, or low-powered mobile telephone node, that improves a network’s spectral efficiency by allowing the same frequencies to be reused within a geographic area thanks to its limited range (10 meters to a few kilometers).
We are approaching the end of Q1 in 2018 and for various reasons across the world, I believe that in the coming days many of our readers will probably be taking a short break. Whether it’s because of traditional festive holidays that are coming up in many parts of the world or because of the change in the seasons. So, this is a great moment to pause and think how 2018 has progressed so far.