# Questions tagged [signal-power]

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### How to measure the PAPR of OFDM signal in practical case

The way of investigating the PAPR for OFDM system using MATLAB is known, but what I am looking for is: can we measure the PAPR effect in real systems? For example, assuming we have a transmitter and a ...
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### Why am I not getting proper values of power(Px) and energy(Ex) signal as per book?

I am considering an energy signal in MATLAB as I am going through the book Signals and Systems Laboratory with MATLAB by Alex Palamides. My Matlab code is below: ...
1 vote
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### Is there instantaneous energy for signals? Why is $\big|x(t)\big|^2$ instantaneous power?

Today I learned, instantaneous power is $$p_x(t) = |x(t)|^2$$ and I've known, energy is $$E_x = \int_{-\infty}^{\infty} |x(t)|^2 dt$$ What I also thought was, $|x(t)|^2$ is instantaneous energy, ...
505 views

### Definitions of Discrete Power Spectrum and Discrete Power Spectral Density

I have been reading lots of posts about the scaling factors in PSD, and related topics on this forum. My understanding of the topic has been greatly improved. Thankyou all. I just need a little more ...
65 views

### Bartlett's method: Order of normalisation?

I want to estimate the power spectrum of a given signal using Bartlett's method. I understand the general purpose of the method. However, I do not get my head around the algorithmic description of the ...
1 vote
226 views

### Minimal SNR to distinguish LFM target from noise at range doppler output

I am working on a radar signal processing project using MATLAB. I am required to simulate range doppler maps for Linear Frequency-Modulation (LFM) targets (non-fluctuating) in noise at various SNRs (...
1 vote
224 views

### Calculating SNR of one N-point DFT over another M-point DFT in frequency domain

Consider N-point sine signal mixed with a random noise (implemented in Python below): ...
80 views

### signal power from single sided DFT

Definitions As far as I know the power of a signal can be expressed (using discrete time samples) via: $$P_x=\frac{1}{N}\sum_{n=0}^{N-1}\big|x[n]\big|^2$$ For details see this question. However, it ...
110 views

### Energy ratio of signal

What is the energy ratio of signal at frequency domain? What is its mathematical formula at frequency domain and what can stand for? I found it in this paper https://www.researchgate.net/publication/...
1 vote
953 views

### What's the meaning of negative frequencies after taking the FFT in practice?

Suppose I have a signal $x(t)$ with baseband bandwidth $W$ Hz and power $P$, and consists of $K$ samples, and I draw the two-sided power spectral density (PSD) of this [baseband] signal in MATLAB as <...
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### Signal power normalization

Let's say a I have a signal x= [1,2,3,4,5,6,7,8,9,10,11] y= [0, 2, 4, 6, 8, 10, 8, 6, 4, 2, 0] How do I normalize this signal so the integral from 0 to 10 (along x-...
23 views

### Normalized Power of a signal [duplicate]

I have the following power values in Watts of a signal: 6.5e-8, 4.6e-8, 7.1e-8, 1.01e-7, 9.98e-7, 2.5e-6, 3.96e-6, 2.84e-5, 2e-4, 4.05e-4, 1.7e-6, 8e-7, 8.23e-8, 8.32e-8. How do I normalize this to ...
1 vote