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Discussion Groups | Matlab DSP | Low frequency - High frequency signal


Technical discussion about Matlab and issues related to Digital Signal Processing.

  

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Low frequency - High frequency signal - maha devi - Dec 3 7:51:44 2009

Hi all,

I have a question about exp(j2*pi*n) signal . This signal is a impulse in
frequency domain. I could not get much intuition about this signal. but I
see this signal used in many applications related to radar. what is its
property like? What difference will it cause in transmission( in terms of
distance travelled, energy , power, reflections) when it is low frequency
and high frequency. Thank you so much. I got really good replies for my
previous question on this forum.. Thanks a lot to everyone

Regards,
Mahadevi.





Re: Low frequency - High frequency signal - Jeff Brower - Dec 3 9:44:10 2009

Mahadevi-

> I have a question about exp(j2*pi*n) signal . This signal is a impulse in
> frequency domain. I could not get much intuition about this signal. but I
> see this signal used in many applications related to radar. what is its
> property like? What difference will it cause in transmission( in terms of
> distance travelled, energy , power, reflections) when it is low frequency
> and high frequency. Thank you so much. I got really good replies for my
> previous question on this forum.. Thanks a lot to everyone

Your signal is a sine wave in the time domain -- there is huge amount of info
online about sine waves that you can study.

But just a comment about intuition of this signal:  I like to think of
sinusoidal signals as efficient ways to
transmit something.  RF signals, power lines, audio tones, light (to some
extent), tsunamis -- all sine waves, and all
efficient ways to "move something" over distance.

-Jeff




Re: Low frequency - High frequency signal - Mohammad Alawieh - Dec 3 10:23:03 2009

> I have a question about exp(j2*pi*n) signal . This signal is a impulse
in
> frequency domain. I could not get much intuition about this signal. but I
> see this signal used in many applications related to radar. what is its
> property like?

The exp( ) is an eigen value, that is the output of the channel has a direct
relation (in a SISO system its a multiple).

> What difference will it cause in transmission( in terms of
> distance travelled, energy , power, reflections) when it is low frequency
> and high frequency.

High frequency is preffered becuse of the less interference (ISI), I dont
know if it has something to do with distance traveled !

Mohammad

-- 
Mohammad Alawieh
Fraunhofer IIS
Power Efficient Systems Department
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