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| Show all threads Hide all threads Show all messages Hide all messages | | This is soo000ooo funny problem! | B@R5uk | 1704. Demodulation | 13 Jan 2018 21:30 | 1 | You need to compute two scalar products, each for 0 bit and 1 bit. Then just compare it. That'a ALL!!! If you are afraid of amplitude being negative then abs() each product and compare them after. There is no need to fuss about anything: carriers and constant level orthogonal to each other and noise guaranteed to be small by problem statement. Well, if noise was too big betrayer would never be able to transmit his data. Even if every bit was transmitted with differen amplitude and different constant level this approach still would work.
I just do not undestand why this problem is rated soooooo high?! | | What kind of Noise() function??? | xurshid_n | 1704. Demodulation | 21 Jan 2017 11:29 | 1 | Noise() - is constant, or linear, trigonometric, or random function??? | | Hints | Fyodor Menshikov | 1704. Demodulation | 23 Jul 2010 19:55 | 6 | Hints Fyodor Menshikov 21 Apr 2009 21:30 1. Minimize sum of squares of differences, not sum of absolute values of differences.
2. It is important, that constant AMP (amplitude) is the same for all bits.
3. There is no test with negative amplitude. Hint should be:
notion of appropriate statistical processing:
extracting a and b in a+b*k from noise
Or
MNK
Or
sequental analysis
Or
maching learning
Or
optimal decision theory
What artical in Wikpedia should read? Re: Hints Alipov Vyacheslav [Tomsk PU] 22 Jul 2010 01:48 Would you be so kind to give the slightly more detailed description of your solution?
I tried to used DFT but it seems to be too sensitive to noise.
I heard of Arctan-Differentiated Demodulator, but I can't find the literature on this theme. Does anybody know, is it applicable here? Re: Hints Vedernikoff Sergey (HSE: АОП) 23 Jul 2010 02:29 Use OLS (ordinary least squares) estimator for this problem Re: Hints Alipov Vyacheslav [Tomsk PU] 23 Jul 2010 19:55 Thanks a lot. I've never used this method before. But it's worth keeping in mind :) | | WA3 Please help!!! | SirJ [KhAI] Smusenok Sergey | 1704. Demodulation | 9 Jan 2010 00:28 | 1 | я решаю через количество пересечений графиком синуса ось ох, вроде алгоритм правильный а преодолеть третий тест не могу. помогите пожалуйста!!! | | Mistake in statement | OpenGL | 1704. Demodulation | 10 Apr 2009 13:49 | 3 | In russian, "кочевники ограбили очередной корован". Right word- "караван". :) OpenGL 10 Apr 2009 13:49 | | What does "punctuation signs" mean? | Blue Mary | 1704. Demodulation | 4 Apr 2009 16:23 | 1 | All printable nonspace & non-letter characters? |
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