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In reading a paper on demodulation there was this sentence:

"Using complex-envelope notation, the noise corrupted waveform at the IF filter output can be written as...".

I've not heard this term, what does the complex-envelope notation mean?

The equation below that statement is:

$$z(t) = \mathrm{Re} \left\{ \widetilde{z}(t)e^{j2\pi f_0t+\theta} \right\}$$

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    $\begingroup$ Read about analytic signal and this presentation will become clear. $\endgroup$ – jojek Oct 16 '14 at 15:48
  • $\begingroup$ The z on the right side of the equation had a tilda over it, I'm not sure how to represent that here though. $\endgroup$ – tylerjw Oct 16 '14 at 15:48

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