# Tag Info

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### Is the periodogram squared-magnitude DFT or squared-average DFT?

The periodogram is simply the squared magnitude of the DFT. Since the periodogram is a rather poor estimate of the power density spectrum of a random process there are methods which use averaging of ...
• 80.2k
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• 40.4k

### Interpretation of Clarke's Doppler power spectral density

In addition to Carlos answer, I want to correct your general understanding: What I understand of Doppler spread is that the relative motion between Transmitter (TX) and Receiver (RX) change the ...
• 6,058

• 80.2k
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### Show That the Power Spectrum Density Matrix Is Positive Semi Definite (PSD) Matrix

Pay attention that for a Scalar Random Process the Power Spectrum Density is non negative. Namely, let $y \left[ n \right] \in \mathbb{R}$ be a WSS Random process with its Auto Correlation function ...
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• 31.4k
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### Allan Variance vs Autocorrelation - Advantages

My current work involves the design details of atomic clocks where we use the Allan Variance and Allan Deviation (ADEV) extensively. The primary point is that it can be used for non-stationary ...
• 37.1k
First, multiply (-174dBm/Hz) by 180000, then convert the result into watt? Because the decibel is a logarithmic unit, you need to be careful here. $-174\mathrm{dBm}$ means $10^{-17.4} \mathrm{mW}$. ...