# Tag Info

## New answers tagged power-spectral-density

### How do you find the null to null bandwidth for the signal below?

The $\text{sinc}$ function is the Fourier Transform of a Rectangular pulse. Its zeros are located at non-zero integers of $x$. Therefore, if your spectrum can be expressed as $\text{sinc}(Bx)$, the ...
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### How do you find the null to null bandwidth for the signal below?

The key observation is that $\text{sinc}(x)$ is zero for all arguments $x$ that are nonzero integers, so the problem reduces to "what values of $f$ yield the nonzero integers closest to zero, ...
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### How do you find the null to null bandwidth for the signal below?

The following MATLAB script is a solution to your question clear all;close all;clc 1. fzero only returns 1 zero ...
Accepted

### How to plot in MATLAB the PSD of two signals with different bandwidths

The spectrum of a BPSK signal has a sinc function envelope. That's not bandlimited and falls off very slowly with frequency so you can't easily sample it without getting significant amount of aliasing ...
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1 vote

### Why power = variance = rms^2 in the White Noise process?

I saw the article variance = power = rms^2 in White noise. That's true for almost all mean-free signals, not just white noise. For simplicity, we assume a discrete real signal, $x[n]$ of length $N$ ...
• 34k
1 vote
Accepted

### Why power = variance = rms^2 in the White Noise process?

The relationship between variance and rms value follows directly from the definition of variance. For a continuous random variable, it is defined as:  \sigma^2 = E\left(\left(X - \mu\right)^2\right) ...
• 23.8k