8. Modulations
September 27, 2018
Antennas - Focusing EMWs
6. Antennas – Focusing EMWs
September 27, 2018
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Signals and Channels

What happens to periodic signals if their period tends to infinity?
How do we describe continuous signals in terms of sine waves?
How does a time-varying signal tell us what frequencies we need to mix in order to form it?
What happens when we cut some of these frequencies?
What is the extent of the frequency-time duality?
How do we turn a continuous signal into a discrete set of bits?
Can we always do this without losing information?
What is sampling and why is it important?

Signals and Channels - Part 1

Signals and Channels - Part 2

Signals and Channels - Part 3


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