Questions tagged [signal-power]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
3
votes
2answers
77 views

Frequency content Signal processing of very large files

I recently had to process a very large file to obtain the power spectrum. The file had about 60m measurements (arguably its not that huge, but its getting to that point). Although, in the end (...
0
votes
1answer
42 views

The plot of instantaneous power of the Dirac function

I am very confused. I have tried researching this question for the last two weeks and I cannot get a conclusive answer. I was wondering how would I go about plotting the instantaneous power in the ...
2
votes
2answers
91 views

Power of a real exponential signal

I am having difficulty with the case when a is real. But after this, I am not going anywhere.
0
votes
1answer
78 views

Energy per symbol calculation

I am having trouble calculating my Energy per symbol and Es/No. Using these parameters and equation $N_s = $Number Symbols $R_s = $Symbol Rate $T_s = $Symbol Time $sps = $samples per symbol x = signal ...
0
votes
1answer
32 views

Calculate the power of a discrete-time signal

We got this question in our test :- $$S(t) = 5\cos(10πt - π/2) + 6\sin(15πt)\cos(15πt)$$ My Solution :- $$S(t) = 5\cos(10πt - π/2) + 3\sin(30πt)\qquad \textrm{[Using $\sin(2A) = 2\sin(A)\cos(A)$]}$$...
0
votes
1answer
47 views

Concept of energy threshold

I am analyzing some program responsible for detecting the correct signal in the channel on the receiver side. It seems to me that such an implementation allows for the detection of the correct packets ...
1
vote
1answer
22 views

Spectral properties of QPSK modulation

From what I've read, the spectral properties of the modulation largely depend on the rate of change of the signal phase - "a signal in which the phase changes stepwise has a broad spectrum, well ...
0
votes
0answers
29 views

How to find Integration of sinc function and then it's infinite summation?

I was doing this problem,i got answers of (a) and (b) by going following way, first i computed F.T. of x(t) as follows which in turn will be used to estimate it's bandwidth which will come as 2Hz and ...
0
votes
1answer
45 views

How is the Tx/Rx Gain calculated in USRP?

I know that USRPs are uncalibrated devices. In many exampls you can set the so called Tx or Rx gain (as in the picture below). Now, I know that this does not correspond to the real power of the ...
4
votes
1answer
44 views

SNR of filter output

I have a filter where the input is: $$ x(t) = s(t) + w(t) $$ which is signal plus white Gaussian noise and the output is $y(t)$. If the impulse response of the filter is $h(t)$, then: $$y(t) = s(t)*h(...
1
vote
2answers
173 views

Find power of a sum of sinusoids

We got this question to solve: Calculate the power of the signal: $$s(t) = 8\cos\left(20\pi t-\frac \pi4\right) + 4\sin(15\pi t)$$ Now, I thought of two approaches : Use Parseval theorem, so first ...
1
vote
3answers
39 views

Signal variance and power connection

For a random signal $x(n)$, why is $E(x(n)^2)$ called signal power? Is it really power? Any proof?
2
votes
2answers
106 views

Power of an angle-modulated wave

Let $$\phi(t) = A\cos(\omega_c t + km(t)) \tag{1}$$ be an angle-modulated wave(FM or PM). What's the power of $\phi(t)$? Intuitively, it seems that the answer is $$P = \frac{A^2}{2} \tag{2}$$ since ...
0
votes
1answer
31 views

What should go to infinity in power's formula N or the repetition KN?

I have this question : I should now calculate power of y[n], where the formula well in the power's formula N which constant goes to infinity how could this be ? i see in the question that N=7 which ...
0
votes
1answer
69 views

Relation between power of the baseband signal and the low pass equivalent

Let $x(t)$ be a real bandpass signal and $x_l(t) = (x(t) + j\hat{x}(t))e^{-j2\pi f_0t}$ be the lowpass equivalent. Is there any relation between $P_x$ and $P_{x_l}$ where $P_x$ refers to the average ...
1
vote
2answers
72 views

Is this an energy or power signal?

Is the given input signal x[n] an energy or power signal? The image shows what I did so far. Is it correct? Thank you! EDIT: I solved it again, please tell me if I did it correctly this time. $$E= \...
1
vote
1answer
34 views

Why can't the callee whom I am on call with hear the sound coming from my phone's speaker but I can while my phone is on loud speaker?

I was on call with my friend and have put the phone on loud speaker and I opened youtube,The sound was audible to me but not to my friend. How is it even possible when he can hear my voice but not the ...
1
vote
1answer
117 views

Finding Minimum SNR or Minimum Detectable Signal Based on Noise Spectral Density

Imagine I have an $n$-bit sensor, whose noise spectral density is $V/\sqrt{Hz}$. $V$ is an exemplary measurement unit. The desired measurement bandwidth is also known. Is there a mathematical way to ...
1
vote
1answer
76 views

awgn function in MATLAB

I'm using 'awgn(input_signal,snr_db,'measured')' function in MATLAB to add white noise to the input signal. Here is the simplified script. Does zero padding the input signal affect the behavior of ...
0
votes
1answer
32 views

How to compute total interference power at receiver antenna

I would like to know what is the proper way to sum interferences. I have, for example, let say 0.4 mW, 0.035 mW and 0.2 mW are those interferences. Do I have to sum them resulting 0.635 mW or make a ...
0
votes
0answers
23 views

Energy or power signal for continuous signal

I have solved $w(t) = 1dt$ and determined it as power but when $w(t) =\Pi\left(\frac{t}{T_0}\right)$ it is energy.
0
votes
0answers
29 views

Received signal's power under Raleigh fading

I am trying to understand how to calculate the power of a received signal under Raleigh fading. What I gather is that the Rayleigh fading is a complex Gaussian random variable and that the multipath ...
0
votes
1answer
54 views

Signal Power estimation

I want to add a White Gaussian noise to noise-free signal given desired SNR value. To do that, I am looking for a way to estimate the power of the signal. The noise-free signal looks like the ...
1
vote
0answers
73 views

Finding the Energy & Power of a Composition of Odd and Even Signal

Given two CT signals $x_1(t)$ (even signal) and $x_2(t)$ (odd signal). If $x_1(t)+x_2(t)$ is an even signal then what is the energy and power of $x_2(t)$. My Attempt $\int \limits _{-\infty}^{+\infty}$...
2
votes
1answer
149 views

Calculating the peak power of a signal on python

As far as I've researched, the energy and power of a given (discrete) signal are given by $$E = \sum_n \left|x_n \right|^2$$ $$P = \lim_{N\rightarrow\infty}\frac{1}{2N+1}\sum_n \left|x_n \right|^2$$ ...
1
vote
1answer
85 views

Es/N0 with roll-off

I was trying to figure out if the relationship between SNR and Es/N0 changes with roll-off factor. $W$: RF bandwidth. $B$: Base band bandwidth. $W = 2B$. $E_s$: Symbol energy. $P_s$: Symbol power. $...
0
votes
0answers
13 views

Is it interesting to look at two conditions and compare their power spectral density at frequencies?

so I am doing my thesis in Neuroscience and trying to prove the alpha blockade, i.e. the reduction in power of the alpha frequency band when the eyes are open compared to when they are closed. I used ...
0
votes
1answer
32 views

What is the unit-power information signal?

I am learning signal processing for my subject and have some problems with the unit-power information signal. I refer to this paper: https://arxiv.org/pdf/1906.03949.pdf In this paper, they formulate ...
1
vote
1answer
95 views

How to calculate time domain SNR using known sequence

I am using the following formula to calculate SNR of a real world complex baseband signal sampled at 1x Nyquist. ...
1
vote
1answer
34 views

Power Spectrum analysis arbitrary length signals

I have signals belonging to diseased and healthy samples recorded from multiple electrodes. These signals are taken monthly and are of arbitrary length (say 4-5 mins). I am planning to do a power ...
2
votes
2answers
326 views

Power Spectral Density from Probability Density Function

The samples of a signal $x[n]$ are i.i.d. and follow a triangular pdf with $a = 0,\ b = 2,\ c = 1$: The DC-power of the signal is $$\mu_x^2 = \big(\mathbb{E}(X)\big)^2 = \left(\int_{-\infty}^{\infty} ...
2
votes
1answer
109 views

Getting the power of a signal from its Fourier transform?

I have a non-periodic signal that contains the sinc function in the time domain and so it is a bit difficult to calculate its power (because of the integral) through: $$ {P_x} = \lim_{T \to \infty} \...
0
votes
1answer
38 views

How can I calculate the height at which the mobile phone is located?

I need to calculate Hm - the height at which the mobile phone is located. For calculating I can use: Hb - the BTS height, m L - the rssi-parameter, dB, f - frequency, MHz. When I use an Okuruma-...
0
votes
1answer
119 views

SINAD calculation in MATLAB

I want to understand how SINAD is calculated. In MATLAB there is a funciton called SINAD and I would like to see if I can obtain "the same" answer as the inbuilt function does. From the ...
0
votes
0answers
24 views

modulation depth

When a value for the power dissipated by an AM signal is given, and the depth of modulation is also given. Then you are told to find the modulation depth required to increase the power to a higher ...
0
votes
1answer
59 views

Why is the total power not the same before and after mixing two signals?

I am trying to simulate an IQ mixer by multiplying two periodic signals IF and LO. Edit: My signals are given by $s_{1} = A_{...
0
votes
2answers
40 views

How to calculate the total signal strength and phase shift of multiple signals in a reciever

I have a simulation to make where I have an array of transmitters that transmit the same signal. At a random point, which I have to consider as a receiver I have to measure the phase shift of the ...
0
votes
1answer
63 views
0
votes
1answer
75 views

What is full scale?

I read the Wikipedia documentation and it's not clear to me what is the full scale concept. What is the meaning of changing the full scale? How I can preserve data in that scale?
2
votes
1answer
116 views

Leakage in power spectral density estimation

What does it mean for a power spectral density exhibiting leakes from one frequency bin to other. I am reading a book which states the following: "Often the time series we use as input for our ...
0
votes
2answers
60 views

How can I shape my time channel response, in order to have Gaussian shaped Doppler Spread?

I know how to generate a Rayleigh fading channel but I have no clue how I can shape the Doppler spectrum to be Gaussian. Any help will be really appreciated. ps: I am coding on matlab
9
votes
5answers
732 views

Inconsistency between the units of power spectral density and the definition that people often give

Perhaps someone can help me resolve something - this is my understanding: In deterministic signal analysis, for a signal $x(t)$ the signal energy is defined by $$E_{\textrm{s}} = \int^{+\infty}_{-\...
1
vote
1answer
76 views

dB SPL readings differ from external sound level meter?

I'm trying to write a program that takes values from a MEMS microphone and calculates the dB of the incoming audio data. The microphone i'm using is this: https://www.mouser.es/datasheet/2/218/...
1
vote
0answers
78 views

Calculating the power spectral density on a different bandwidth

Let us say I have the power spectral density for a given bandwidth F1 at a transmit power T. I would like to calculate the power spectral density for bandwidth F2 for 1) the same transmit power T 2) ...
0
votes
2answers
41 views

Channel noise - A misnomer?

I was discussing with a colleague with background in communication about white Gaussian (WG) channel noise. He said noise is not added by the channel and it's just a misnomer. Noise, which is thermal ...
0
votes
1answer
39 views

help with bandwidth diagrams for digital transmission

I am taking a undergrad network course that uses Data Communications and Networking 5th edition containing diagrams and legends which I cannot decipher. Specifically the diagram on the right, has y-...
-3
votes
1answer
103 views

average power of signal given the mean and the variance [closed]

Let a signal be a random process.Given the mean and variance what is the average power of the signal.
6
votes
4answers
991 views

What are the units of the product of two signals?

In a standard mixer, we multiply two signals $x_1(t)$ and $x_2(t)$, each with units of volts $(V)$, and get at the output: $$y(t)=x_1(t)\,\cdot\,x_2(t)$$ I have always thought that the output of ...
1
vote
1answer
72 views

Analytically determine a PSD from a transient function

This question is related to a series of questions I have asked about the units of PSD and ESDs. I include it as a separate question as it may have worth in isolation. As I understand it to compute ...
1
vote
2answers
101 views

The sum part of the formula for a signals power

$$P_x=\lim_{M\rightarrow \infty }\frac{1}{2M+1}\sum_{n=-M}^{M}\left | x[n] \right |^2$$ I have used this formula to find out the powers for different signals, but the sum part of the formula still ...