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I'm a beginner in radio demodulation, and several days can't solve my problem. The problem is to get bit stream from known frequency. I made I C# application that gets the data in real time from FunCube dongle and applies FFT. But what to do next - it is a puzzle for me. The final goal is to detect narrow-band signal on a known frequency and get the bit stream from it. I've already read different books on DSP but I'm at an impasse. So, the question is what to read, where to go, maybe any algorithms.

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    $\begingroup$ I'm not sure I understand the question. What does it mean to get a "bit stream from known radio frequency"? $\endgroup$ – Gabe Jun 20 '12 at 19:24
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    $\begingroup$ Are you saying that you've modulated a signal, fed it to your dongle, gotten the output from your dongle, and now you want to demodulate it and see that you've recovered your original signal? $\endgroup$ – Gabe Jun 20 '12 at 19:37
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    $\begingroup$ So you're asking us how to demodulate your signal without telling us what modulation scheme you're using? $\endgroup$ – Gabe Jun 20 '12 at 19:51
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    $\begingroup$ I ask what to read and what to do to understand how to make it by myself. $\endgroup$ – Valeriy Jun 20 '12 at 19:53
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    $\begingroup$ @Valeriy Can you tell us anything about the signal? $\endgroup$ – Jim Clay Jun 21 '12 at 14:27

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