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Plenty! In fact, since the mid-1970s, people in security have been working on automatic transmission classification. It's a hard problem, and you logically can't detect all transmission schemes, but it's something that's being sold as service and as product, especially for government (and three-letter government agencies). These guys, for example, focus on ...

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Define a level function curve (L) like this: $$L(x,y) = C_0 \cdot x + C_1 \cdot y + C_2 \cdot x^2 + C_3 \cdot xy + C_4 \cdot y^2 ....$$ It has no constanst term. Now, find the best fit to the level curve $L(x,y)=1$. This will yield the values for the coefficients. Normalize the coefficients so the gradient is of a magnitude you like. Find the level ...

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I finally settled on python, and here is why: I had no reason to limit myself to a specific language or framework. The target plateform was not specified, but I needed to have proof of concepts for the project, and quick. I choose python because of its versatility, the profusion of libraries, the speed over other scientific calculation packages, and the ...

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You clarified that your question really is how multiple users can be separated in code space. Since you said that you understand orthogonality well, I assume you just need an example to tie it all together. With reference to the below examples of the DFT (OFDM) and Hadamard Matrices (CDMA) where each row of either represents a different orthogonal code that ...

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