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 โ€“ from the very first Marconi experiments to 5G networks โ€“ is bound by Shannonโ€™s equation, based on the channelโ€™s bandwidth and signal-to-noise ratio....

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