Questions tagged [orthogonal-signals]
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14
questions
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1answer
33 views
Refinement equation and orthogonal wavelets basis
I have a wavelet function space defined by,
$ \phi(x) = \sqrt(2) \sum_n h_{\phi}(n) \phi(2x-n) $ .
given the Fourier transform of the function is:
$\hat{\phi}(\omega) = \frac{1}{\sqrt(2)} \hat{h}...
1
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3answers
256 views
How can I know if these two signal are orthogonal to each other
So the question is to determine if this statement is true or false. The question can be seen below.
I know that two signals are orthogonal if their inner product is equal to 0. I know how this ...
1
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0answers
13 views
Expectation of power spectrum for nonorthogonal wavelets
I'm working through "A Practical Guide to Wavelet Analysis" by Torrence and Compo, and I am confused about section 3d ("Wavelet Power Spectrum").
Let $x_n$ denote the signal, sampled at increments $\...
1
vote
1answer
37 views
Is it possible to spread signal using sum of more than one orthogonal code
I was wondering if we can spread the signal using more than one spreading code. Assume we have the Walsh code used to spread the transmitted signal, the Walsh code is, for example, gotten based on ...
2
votes
1answer
113 views
When Two Sampled Sinusoidal Are Orthogonal?
If two analog sinusoidal are orthogonal with duration T, their minimum frequency difference should be 1/2T in case of no phase offset between them.
And if there is phase offset, the difference is 1/...
0
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0answers
130 views
CDMA-DSSS with orthogonal codes and BPSK modulation: proper way to demodulate
I am having problems when demodulating the signal: If I demodulate the sequence chip by chip and then operate only with binary information the "integrate and dump" (correlator) sometimes will provide ...
0
votes
1answer
28 views
Are there analogues to orthogonal transformations in non-orientable surfaces?
I am working on extremely large, symmetric matrices of counts, and attempting to identify patterns/shapes within them. Wavelets are a popular tool in image processing, and have some nice statistical ...
0
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1answer
88 views
Temporal Orthogonality
I'm studying Digital Communication and I couldn't understand the relationship between temporal orthogonality and sampling theorem.
Definition of the Temporal Orthogonality is as follows:
$$\mathrm{...
2
votes
1answer
199 views
struggling to understand why Fourier basis is orthogonal
Studying DSP on my own time on Coursera.
Was given a proof to why the Fourier basis is orthogonal, but I can't figure it out. Here is how it is proof goes.
Consider the Fourier basis
$$
\left\...
1
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1answer
61 views
Does Hamming encoding preserve orthogonality?
The question I have is this-- if I have two binary vectors, i.e. $x_1, x_2 \in \mathbb F_2^k$ that are orthogonal, i.e. $x_1^T x_2 = 0$, and let's say I Hamming encode each of them separately with an $...
4
votes
1answer
908 views
Orthogonal basis of signal space and the projection of white noise
I am trying to make the relation between linear modulation and nonlinear one by using orthonormal expansion. The purpose is to understand what is orthonormal set in each case and to understand the ...
2
votes
1answer
110 views
Absolute maximum number of possible PN sequences for given length
I previously asked if it was possible to use encryption-grade randomness as a CDMA spreading sequence and learned that the codes must be orthogonal, not necessarily random.
I've tried different ways ...
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votes
7answers
22k views
When are two signals orthogonal?
The classical definition of orthogonality in linear algebra is that two vectors are orthogonal, if their inner product is zero.
I thought this definition might be applied to signals as well, but then ...
1
vote
3answers
400 views
Proving orthogonality
How to prove a cosine signal with irrational period and another cosine signal with a rational period are orthogonal?
For example, $\cos(4t)$ and $\cos(4\pi t)$ sum is aperiodic. Hence it is said that ...
