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what is the meaning of Exponential signals?

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exponential signals

Hi evreyone,
does anyone know the meaning of Exponential Signals and it's types?
and what is the meaning of complex numbers ,is it the mix of Imaginary part and the Real Part of the signal?
Regards
 

exponential

Hi

In communications, the purpose of using exponential signals instead of sinosuid ones is to use both halves of signal spectrum(Negative and Positive sides of spectrum).

For example an FSK signal can not simply downconverted to DC. because its spectrum is not symmetric around its center frequency, so you should downconvert it with exponential signal( the idea of using I and Q downconverter).

Regards
 

real exponential meaning

what is positive and negative sides of spectrum(is it the lower side and uper side in the frequency spectrum)??
sorry i couldn't understand the meaning of an exponential signals ,and what i could not understand in Exponentails signals is the follwing terms:
1-Complex Exponentials.
2-Real Exponential Signals.
3-Periodic Complex Exponential.
4-General Complex Exponential Signals.
i was reading a book called Signals and Systems for openhime and could not understand those terms as the book contains alot of math ,so any explanation for the pervious terms involving less mathmatics will be so helpful.
thanks for the reply.
Regards
 

types of exponential signals

Hi

First, exp(jwt) = sin(wt) + j cos(wt).
Second, When you downconvert a signal to baseband frequency contents at negative frequncy is called negative side of spectrum and positive frequency content is called positive side. Now if your signal is real negative side and positive side are miror. if your signal is complex neqative side differ from positive side.

Regards
 

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