Questions tagged [signal-power]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
1 vote
1 answer
32 views

Power of signal in specific frequency in FM and AM modulation

My professor gave us the following problem: Given a sinusoidal signal with $f_m = 1KHz$ which is put into an AM and FM modulation find the modulation index of FM and AM if you know that (amongst ...
user avatar
0 votes
1 answer
22 views

Power Spectrum for feature extraction

I want to extract frequency domain features for my machine learning model, and to do so I have calculated the power spectrum of the EMG signal. One of my first questions is that my frequency is just ...
user avatar
  • 3
0 votes
0 answers
42 views

What are the differences between GPS and GLONASS?

I'm studying the localization systems, especially the GPS one. I inquired about other systems and wanted to understand what are the main differences between GPS and GLONASS, why has the first type ...
user avatar
0 votes
1 answer
47 views

How can I add white gaussian noise to get the required extinction ratio?

I need to add white gaussian noise to my signal in MATLAB so that I obtain 15 dB extinction ratio (ER). I know that ER is max power level to min power level. I use below code to calculate my signal ...
user avatar
  • 53
-1 votes
1 answer
32 views

Plot the Power Spectral Density for a signal in Matlab

I have an OFDM signal x, generated using QAM modulation, I first use the command in matlab y1 = ifft(x); to generate the time-...
user avatar
  • 59
0 votes
1 answer
22 views

number of subcarrier and transmit power

How does the total transmit power affects the number of subcarriers? For example, if we have 624 subcarrier, can we use the same maximum power (for example the budget is 64 watts) as we will when we ...
user avatar
0 votes
1 answer
58 views

Calculating instantaneous power of a frequency band in a 1-d signal

I am trying to calculate the instantaneous power of a 1-d signal within a particular frequency band in an on-line, real-time, streaming application. I have tried using sliding window FFTs but these ...
user avatar
0 votes
0 answers
40 views

Correct Noise for NOMA system

I am trying to simulate a NOMA system with SIC, but I'm so confusing with the noise expression: $n_m \sim CN(0, \sigma^2_m)$, is zero mean complex additive Gaussian noise with variance at mth user ...
user avatar
1 vote
1 answer
23 views

How to find the relative energies between multiple frequency bands?

I am filtering my input into four frequency bands using IIR filters. The output of each band has some disturbances or ripples in it. I am looking for a method to normalize the four bands so that all ...
user avatar
2 votes
2 answers
152 views

Confusion regarding energy and power signals?

I know that when a signal has finite energy,it is energy signal and when its power is finite, it is power signal But what is exactly meaning of finite here? Zero also included? For example if a signal ...
user avatar
  • 906
0 votes
0 answers
53 views

Problem to extract value from complex_to_mag_squared GNURadio block

I am trying to dissecate a large bandwidth into smaller ones and, for each of those smaller bands, see if it contains enough energy to consider that a message is sent in it. To do so, I am thinking of ...
user avatar
0 votes
2 answers
33 views

High frequency and received signal power? Why using massive MiMo?

The power received by an isotrapic antenna is calculated by: $P_0=\frac{P_T}{4 \pi d^2}\cdot \frac{\lambda^2}{4 \pi} = \frac{P_T}{4 \pi d^2}\cdot A_e$ or, by Friis transmission formula: $\frac{P_r}{...
user avatar
4 votes
0 answers
68 views

Energy and Time Signals

In Signal Processing, we broadly categorize signals as either being "Energy Signals" or "Power Signals". If the total Energy for a signal is finite, we categorize it as a Energy ...
user avatar
  • 36.1k
-1 votes
1 answer
50 views

what is bi-spectrum of signal

anyone knows what is bi-spectrum and its usage in signal processing? how can I extract data from bi-spectrum of signal? I want to use bi-spectrum of signals to classify them and I want to knows the ...
user avatar
0 votes
1 answer
59 views

Receiver Peak Output Voltage

I am currently on a university course doing a telecommunications module. I have been doing some past papers today and came across a question around peak output voltage of an optical receiver and have ...
user avatar
  • 1
1 vote
1 answer
74 views

What is the meaning of dbFS/LSB

A simple question that I am not able to find any solution online or in the literature I have. What does it mean when it something is written as dbFS / LSB, for example ...
user avatar
  • 13
0 votes
1 answer
44 views

Why the received SNR increases with bandwidth?

I am performing the following simulation: Complex chirp signal with bandwidth [-B, B] is transmitted through a multipath channel which has $N$ taps all being complex Gaussian variables (i.e., ...
user avatar
-1 votes
1 answer
48 views

Random Signal Energy

Why the energy of random signal(random process) is infinite? and why random signal can not be zero at infinity? I know that there is a relation between the tow questions but I'am still confused.
user avatar
0 votes
1 answer
76 views

Relation between SNR and fading channel coefficients?

I am trying to understand the following thing: Does the average signal to noise ratio (SNR) depends on fading channel coefficients ? Any help in this regard will be highly appreciated.
user avatar
  • 1
0 votes
1 answer
18 views

total rms current from rms current values

I would like to calculate the RMS current value over a say an hour from RMS current values taken at minute intervals. I don't have access to the instantaneous current values, just the rms current ...
user avatar
1 vote
1 answer
140 views

How do we equate the signal energy before and after sampling?

I have a band-limited signal and sample it at sample rate of $f_\mathrm{s}$. By taking the continuous time fourier transform, I will see copies of the same signal at $n\cdot f_\mathrm{s}$ where $n \in ...
user avatar
1 vote
3 answers
76 views

Multiplying complex signal with its own complex conjugate transposed copy? [closed]

Let input be a real (audio) signal, and let X be its complex frequency domain representation. What does the output represent when the frequency domain signal is ...
user avatar
  • 472
3 votes
3 answers
98 views

$\frac{\mathbb{E}[P]}{\mathbb{E}[N]}$ vs. $\mathbb{E}\left[\frac{P}{N}\right]$

This is a very simple question arised from my considerations in here: Log-normal shadowing and mean power. I have understood that SNR is often defined as $$\frac{\mathbb{E}[P]}{\mathbb{E}[N]},$$ but ...
user avatar
  • 126
0 votes
0 answers
78 views

maximum faithful coverage distance of signal

For a microwave terrestrial-based line-of-sight communication operating at 10 GHz, what is the maximum faithful coverage distance that the signal could make before requiring a repeater? The following ...
user avatar
  • 1
2 votes
2 answers
126 views

The transmission distance of a signal

I am no professional in this area so please forgive me if this question is too immature. And thanks in advance for any help and information. I want to know how to calculate the transmission distance ...
user avatar
0 votes
1 answer
64 views

Log-normal shadowing and mean power

Let's assume I'm receiving a signal with power measured in dBm shadowed according to the normal distribution, i.e. $P_{\text{dBm}} \sim N(0,1) $. If there is also a normally distributed noise power $...
user avatar
  • 126
0 votes
2 answers
275 views

Units of a Fourier Transform (FFT) and Spectrogram [closed]

I am very interested in analyzing signals in the frequency domain. Units of a Fourier Transform (FFT) when doing Spectral Analysis of a Signal 1.In the previous question, answer the unit for the ...
user avatar
1 vote
1 answer
37 views

What does not happen if we limit the duration of this sequences to 2014 samples?

I am confused with this multiple-choice question: Assuming that $x(n) = e^{-2n}u(n)$, what does not happen if we limit the duration of this sequences to 2014 samples? A. The signal power leaks out ...
user avatar
1 vote
0 answers
57 views

How to calculate received signal power for a Multi-User MIMO OFDM system?

I have a Multi-User MIMO system where there are 2 users served by a base station. The base station consists of 64 transmit elements and the users are equipped with linear antenna array consisting of 3 ...
user avatar
  • 21
0 votes
0 answers
37 views

Problem with creating wavelet transform

I am trying to create time-frequency representation of my brain signal. I would like to create the data for frequencies from 0hz - 120hz (so it can cover, delta, theta, alpha, beta, low-gamma and high-...
user avatar
  • 139
0 votes
1 answer
113 views

How to extract noise from a signal in order to get both noise power and signal power

I have to implement a function to get an accurate SNR value. For that, I would need a separate noise signal to get the signal power and noise power but I have only one noisy signal (a .wav file.) ...
user avatar
0 votes
0 answers
52 views

Is this a valid way to calculate SNR?

If I calculate 1.) the average power of a signal, $P_s$, in terms of the average energy of the signal, $E_s$ and take it as a constant over a given period of time, $T_s$, as $P_s=E_s/T_s$ where $E_s$ ...
user avatar
1 vote
1 answer
91 views

Estimating the SNR of respiration signal

I'm trying to evaluate the SNR of a respiration signal on Matlab environment, so the bandwidth considered is [0.04-1Hz]. The problem is that noise is overlapped on the signal, so I can't evaluate the ...
user avatar
  • 13
0 votes
1 answer
65 views

Does the RMS value of a signal yields its root-power?

I'm relatively new to the field of signal processing and might be a bit confused about terminology here. I'm trying to understand what determines whether I deal with a root-power or simple power ...
user avatar
  • 103
0 votes
2 answers
67 views

Working out EIRP

There is a debate about the proper way of how to calculate the EIRP, so I need your help on which method is wrong and why please! Let's suppose we have the following: Output power: 165 W Reflected ...
user avatar
0 votes
1 answer
37 views

Understanding SNR effect on signal [duplicate]

I'm studying how SNR is measured, I know is a ratio between the power of signal and noise, and is given in a logarithmic scale but I'm confused about how is interpreted, for example does a SNR of 6 ...
user avatar
1 vote
2 answers
61 views

Saturation in magnitude estimation?

An magnitude estimate algorithm has been used for a while in which no multiplication is done. See link here: http://dspguru.com/dsp/tricks/magnitude-estimator. This method does have advantage in terms ...
user avatar
3 votes
2 answers
75 views

Correlation: A Magnitude or Power quantity?

I am confused about the units we would refer to with a correlation result in that if it would be a magnitude or power quantity (and therefore specifically when using ratios in dB would we use 10Log or ...
user avatar
  • 36.1k
0 votes
1 answer
360 views

Calculating total power for the signal

In my previous question I asked about calculating a single number as "Spectral Density" feature from signal data. We concluded that it is really a total power and article (link) authors ...
user avatar
  • 111
0 votes
1 answer
147 views

Output power of a signal passing through an IIR filter

suppose I have the following discrete time signal $x\left(n\right)=0.7\sin\left(2\pi \times 623\:nT\right)$ where $N=4000$ and $T=\frac{1}{f_s}$, where $f_s=40$ kHz I pass this signal through a simple ...
user avatar
  • 303
3 votes
2 answers
95 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 (...
user avatar
  • 133
0 votes
1 answer
77 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 ...
user avatar
2 votes
2 answers
174 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.
user avatar
0 votes
1 answer
532 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 ...
user avatar
0 votes
1 answer
39 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 :- $$S(t) = 5\cos(10πt - π/2) + 3\sin(30πt)\qquad \textrm{[Using $\sin(2A) = 2\sin(A)\cos(A)$]}$$...
user avatar
0 votes
1 answer
92 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 ...
user avatar
1 vote
1 answer
182 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 ...
user avatar
0 votes
1 answer
380 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 ...
user avatar
4 votes
1 answer
77 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(...
user avatar
  • 45
2 votes
2 answers
1k 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 ...
user avatar