A3-Digital Communication principles

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⌘ Summary

• radio wave propagation
• Electromagnetic signals
• Nyquist Theorem
• Signal/noise ratio
• Shannon Theorem
• Signal strength

⌘ Nyquist Theorem

• Shannon: If a function contains no frequencies higher than [cycles/s], it is completely determinded by giving its ordinates at serires of points spaced seconds apart

• band-limitation versus time-limitation
• Fourier transform

[source: Shannon, 1948]

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