Low frequency - High frequency signal

Started by maha devi December 3, 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.
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
> 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
Navigation Group
Nordostpark 93
90411 Nnberg
Phone: +49 911 21 35 504
Mobile: +49 176 64 37 33 75
> 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
Navigation Group
Nordostpark 93
90411 Nnberg
Phone: +49 911 21 35 504
Mobile: +49 176 64 37 33 75
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
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.