Recent content by sanjaysan

So, is x(t)cos(wt)+y(t)sin(wt) the required complex exponential modulated signal?

Bassalisk, How do i go about generating the complex exponential e^(jwt)? You said a system which transfers sine and cosine waves in parallel. Do you mean sin(wt)+cos(wt)? shouldn't it be cos(wt)+j sin (wt)?

I've read the whole paper. Its not about SSB modulation. The author specifically talks about using the negetive frequency components for communication. Heres the link to the paper- http://arxiv.org/pdf/1012.1403v5.pdf Any feedback would be appreciated.

Sophie, I get that we have been 'picking the more suitable result' for analysing the signal. But, I recently read a paper titled "Negative frequency communication" which says that half of the frequency(negetive) is being wasted and it does have a physical meaning. You can read more about it...

Warren, Are you saying there is no physical significance attached to negative frequencies?

Yes, filters do have a mirrored profile about y-axis in frequency domain, hence filtering out the negative frequency component is not possible. Anyway, why i had this question was that i noticed that any periodic signal has symmetric mirrored profile about the y-axis in f domain. This, i think...

I understand what you are trying to say. But, what i was looking for is a means of eliminating the original negative frequency component in the modulating signal without having to shift it by the frequency of the carrier. In other words, i don't want any frequency components towards the left...

when a signal is represented in frequency domain, it has both positive and negative frequency components. example:- cos(2*pi*f*t) in freq domain has 0.5*d(t) at +f and -f. I am looking to eliminate the component at -f. (d(t)=delta function)

thanks,that answers my question:)

Hi, Is there any method(circuit) to retain only the positive frequency components of a signal? thanks in advance.

Hi, I stumbled upon the following two functions which have the same freq domain representation, 1/(j.pi.f) 1.signum(t) = u(t) - u(-t) 2. 2u(t) what is the reasoning behind them having the same f domain representation?