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Periodic noise in an SDR spectrum is a common problem. One likely source is EMI or RFI from nearby electronics. The sources of EMI and RFI can be from computers, USB cables, networks cables and routers, power cords, wall plug or internal power supplies for various electronic devices, wireless chargers, LED lighting controls and voltage converters, and ...


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I believe, there are two aspects of your question. For the FFT calculation, the power density spectrum is the square of the FFT modulus multiplied by the sampling period (in your notation: T) and divided by the number of samples (in your notation:L): T/L * abs(FFT(X))^2 or T/L *abs(Y(f))^2 Here is now where I believe you have an error, you have to add ...


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The PSD of the altitude of countryside with rolling hills has all the energies concentrated in the low frequencies, and as strong as the altitude change from hill to valley. The PSD of the altitude of countryside with jaggy mountains and cliffs and stuff has much greater high-frequency content, but with low frequency content corresponding to the "big" ...


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