Questions tagged [conjugate]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
2
votes
2answers
718 views

Result of conjugate symmetry property of DFT

I know one of the properties of DFT for real-valued time series is conjugate symmetry. But what does it imply? In the textbook it says that for a DFT of the length M, this makes M/2-1 spectral ...
2
votes
1answer
250 views

Fourier Transform gives unexpected results: signal reversal and conjugation

As far as I understand the math you can reverse a real valued signal by Fourier transformation, taking the complex conjugate of the result and inverse Fourier transformation, i.e. \begin{equation} \...
0
votes
1answer
84 views

Complex Conjugate Sinusoids in Forward DFT

I hope this isn't such a dumb question, but I'm finally getting to grips with the inner workings of the DFT. What I'm having trouble understanding is why the basis complex sinusoids in the "forward" ...
1
vote
2answers
1k views

How to interpret output of matched filter with complex input?

I have implemented a matched filter based on the Fourier Transform approach. In the real numbers domain that means that I use as the coefficients of my filter (B) the inverted time-samples of the ...
3
votes
1answer
19k views

Conjugation in Fourier Transform

I have a very simple question. In Oppenheim book, it says that: If CT Fourier transform of $x(t)$ is $X(j\omega)$ then, CT Fourier transform of $x^*(t)$ is $X^*(-j\omega)$. What I can't ...
0
votes
1answer
2k views

Meaning of Multiplying a complex number with its conjugate

While reading Estimation of Symbol Timing Offset, i came across an equation like multiplying a signal with its conjugate. $$ \hat{\delta} = \arg \max_{\delta} \sum_{i=\delta}^{N_g-1+\delta} \left|y^*(...
7
votes
3answers
21k views

How to make a signal conjugate symmetric?

Take the simple frequency-domain band-pass filtering operation below . . . ...