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Questions tagged [interference]

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How can it be possible that I hear people voice from my computer speaker?

I searched on web and apparently can be due to truck drivers communicating at CB band which is around 20MHz. And apparently this communication may interference with the frequencies used by computer's ...
allexj's user avatar
  • 15
0 votes
1 answer
62 views

What is the most used signal for basic pulse?

My professor said that: in order to avoid interferences/harmonics caused by the nature of the square wave g(t) (sinc will have these secondary lobes), it's better to change the basic pulse g(t) to ...
allexj's user avatar
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0 votes
1 answer
41 views

Since harmonics only generate at multiples of the center freq, is it for this reason that the left part of a FT (like sinc) has no physical meaning?

If we have a rectangular pulse function, we know that after a Fourier transform we obtain a sinc: We know that the left part (negative frequencies) has no physical meaning and it's just specular. It'...
allexj's user avatar
  • 15
0 votes
0 answers
35 views

Tracking period of quasi-periodic transient type signal in strong non-stationary interference

Consider a desired (pink) signal as well as its observation in heavy, non-stationary interference (green, this is the desired signal plus interference). As seen in the plot, the interference can also ...
rhz's user avatar
  • 447
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0 answers
54 views

Hilbert Transform matches signal rather than envelope

I have an interferogram of a white LED. I am trying to extract the envelope of the signal. Shown is the interferogram, and the absolute value of the Hilbert Transform of the interferogram. I used <...
Matthew H's user avatar
1 vote
1 answer
126 views

Fractionally spaced equalizer - LMS algorithm

I am doing a project in MATLAB about the fractionally spaced equalizer. The method that i have chosen to update the tap weight coefficients is the LMS algorithm. Here is the block scheme that i have ...
Obsidian's user avatar
0 votes
1 answer
44 views

How can I simulate a random delay offset between two data streams?

Suppose I'm transmitting two streams at the same time in blocks each of length $N$ samples each sample of duration $T_s$ seconds. Block $t$ of stream $i$ is $\mathbf{x}_i[t]=\left[x_{i,0}[t],\,\,\,x_{...
Math_Novice's user avatar
3 votes
0 answers
132 views

Emergence - what constitutes a minimally coherent source that "just begins" to produce stationary interference patterns?

A superposition of two signals with different frequencies will never produce visible (i.e. stationary) interference patterns. Such waveforms will produce spatiotemporal beat patterns, but they rapidly ...
srhslvmn's user avatar
  • 131
0 votes
2 answers
64 views

Reconstructing a wave which interferes together with a second known one

Is it possible to calculate one of two interfering waves, if the interference (the sum) $v$ and the other wave (summand) $v_1$ is known? The waves have same frequency but may differ in phase and ...
A.Lymphater's user avatar
3 votes
0 answers
103 views

How does matched filter output provide sufficient statistic when the channel has ISI + AWGN?

In Forney’s MLSE paper (link: https://ieeexplore.ieee.org/document/1054829), Forney mentioned that the matched filter output is still sufficient statistics even with ISI (second column on page 365). I ...
Emm386's user avatar
  • 155
1 vote
2 answers
209 views

Power spectral analysis in baseband vs bandpass

I have two signals $x_1(t)$ and $x_2(t)$ both with a baseband bandwidth of $W$ Hz. $x_1(t)$ is transmitted over carrier frequency $f_1$ Hz, and $x_2(t)$ over carrier frequency $f_2=f_1 + \frac{W}{2}$ ...
Math_Novice's user avatar
0 votes
1 answer
10 views

Knowing the power of a portion of a signal's spectrum inside another signal's spectrum

I have a signal $x_1(t)$ with baseband bandwidth $W_1$ Hz over a carrier frequency $f_1$ and power $P_1$. I also have another signal $x_2(t)$ of baseband bandwidth $W_2$ Hz over a carrier frequency $...
Math_Novice's user avatar
0 votes
1 answer
125 views

How to explain the meaning of the intersection in a Fourier series representation of periodic signals?

I saw a piece of code on github which transforms the planetary movement into the Fourier wave function. These circles are given by the $x$ and $y$ ordinates: $x=\cos (\omega t)$, $y=\sin (\omega t)$, ...
Kevin's user avatar
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0 answers
75 views

Interference between 121.5Mhz and 124.5Mhz

I'm new to Software Defined Radios and trying to find out if powerful signals are a cause of my own interference, a poor setup, or just a lot of traffic. I'm using a HackRF One with an ANT500 antenna. ...
Baa's user avatar
  • 101
1 vote
1 answer
156 views

Simulating RF interference (noise) to captured RF signals

I have carried out an approach to clean my RF signal captured in order to perform classification on a set of devices. However, a further extension to this study I aim to achieve is to evaluate the ...
rshah's user avatar
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0 votes
1 answer
289 views

Can I still use match filter (eg.RCC)at rx when there is none at tx? Can it help with ISI?

As the transmitter is restricted to size and power considerations, there is no way to apply a SRRC filter at tx side. Can I just put a RC(raised cosine filter) at the rx side to alleviate ISI?
ztscotty's user avatar
1 vote
0 answers
924 views

Getting envelope of noisy signal

I am analyzing some interferometry data and have a time signal that looks like this: Our temporal resolution is unfortunately not enough to resolve the fringes. I need to get the upper envelope of ...
Regulus's user avatar
  • 11
1 vote
2 answers
493 views

The raised cosine spectrum and Nyquist's criterion for zero ISI

For the past hour, I've been trying to understand what the book is trying to say here: This is Communication Systems, 5th Edition by Simon Haykin. We know that the Nyquist criterion is I'm unable to ...
Essam's user avatar
  • 267
2 votes
1 answer
42 views

Higher Spectral Efficiency with Frequency Domain Equivalent of Partial Response Signaling?

In other recent posts such as this one, I detailed partial response signaling common to GMSK where a known inter-symbol interference (ISI) is intentionally introduced in the time domain at the benefit ...
Dan Boschen's user avatar
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0 votes
1 answer
143 views

gmsk modulation: ISI reseach

I reseach gmsk modulation with linear approximation + laurent decomposition. In the answere to the my previous post, MR Boschen: L is the overlap of successive symbols as L is given in symbol ...
FrimHart64's user avatar
0 votes
0 answers
33 views

Why is there fear of interference between 5G and airline altimeter C-band?

The C-band frequency range to be used for the 5G-advanced rollout is the US is in the 3.7-3.98 GHz range. Whereas altimeters operate in the 4.2-4.4 GHz range. Is there any genuine reason to worry ...
Naveen's user avatar
  • 418
0 votes
0 answers
58 views

FFT on a specific part of an image [python]

I'm currently working on a project where I have to analyse an interferogram. Instead of doing an FFT on the whole image I'd like to focus only on a small part of it (one fringe) is it possible to ...
Michael's user avatar
  • 75
0 votes
0 answers
41 views

Related to successive interference cancellation?

I am trying to understand the following query: " Is it necessary to do channel estimation to perform successive interference cancellation at the receiver operating over fading channel" Any ...
Saru's user avatar
  • 1
0 votes
1 answer
51 views

Alg for identifying any temporal interfering signal

I'm a little bit on a loss at my search for an algorithm due to audio signals. I'm a sw-engineer with some basis knowledge in math here and there, know how to build and use FFT etc. but with no prof ...
User42's user avatar
  • 87
3 votes
1 answer
135 views

The power of signal processing when faced with hardware constraints

I am currently studying interferometry, but I have only just begun studying signal processing. I want to better understand the effect signal processing can have in maximising signal detection from ...
The Pointer's user avatar
4 votes
2 answers
374 views

How to remove power line interference?

I have a couple of datasets that show a peak around the 50-60 Hz range (mostly around 55Hz and in some cases at their harmonics i.e. 100-120Hz.) In some datasets the spike is significant in comparison ...
user58033's user avatar
0 votes
1 answer
92 views

Detecting and removing interferences from a signal

I am using MATLAB in order to denoise and remove interferences on a signal. I used wdenoise to denoise my signal which works by setting a threshold (for example ...
Mo0nKizz's user avatar
1 vote
0 answers
79 views

Interference fringes movement analysis

I have searched Stackexchange forums for ideas, but could not find anything useful for me. I am registering real-time stability of the He-Ne laser interferometer by analyzing interference fringe ...
Vytautas Sirautas's user avatar
0 votes
2 answers
334 views

Filter for DC component in FFT2 of image

I am trying to get the main frequency of the Fourier Transform of the image below, which is the intereference pattern detected by a CMOS sensor. When I apply fft2, I got the DC peak at 0 frequency, ...
Gianluca's user avatar
0 votes
2 answers
246 views

Fringe movement analysis to extract displacement

I am using a Michelson interferometer with the interferogram recorded on a CMOS sensor. I have taken a video of the fringes moving when a displacement of 50 $\mu m$ is imposed to one of the mirrors. ...
Gianluca's user avatar
1 vote
3 answers
77 views

Can the intelligence message of an FM signal be cross-modulated to another center frequency due to non-linearities?

Can the intelligence message of an FM signal be cross-modulated to a a different frequency by non-linearities, but with the FM modulating message remaining (relatively) intact on the new frequency? ...
Frank's user avatar
  • 169
0 votes
1 answer
257 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 ...
user1993416's user avatar
0 votes
1 answer
132 views

To implement successive interference cancellation (SIC) process, should the receiver know the power allocated to each symbol?

My question is as follows: To implement successive interference cancellation (SIC) process in downlink non-orthogonal multiple access (NOMA), should receivers know all power allocated to each symbol? ...
Danny_Kim's user avatar
  • 171
0 votes
1 answer
397 views

SINR is 3-tap zero forcing filter

I have a following toy example: received signal: $y[n] = x[n] - x[n-1] + z[n]$ and with $\text{Pr}(x[n]=1)=0.3=\text{Pr}(x[n]=-1)$ and $\text{Pr}(x[n]=0)=0.4$ and $z[n]$ is a Gaussian distribution. I ...
user49544's user avatar
0 votes
1 answer
61 views

5G NR Network Collision Avoidance

I'm looking for a technical explanation or a specification that explains exactly how 5G NR collision avoidance will work. I was watching a talk from the Mobile World Conference in Shanghai two years ...
Shrout1's user avatar
  • 103
0 votes
1 answer
53 views

Interference Distribution Assumption in NOMA IoT Scenario

I am assuming a NOMA IoT Uplink scenario, which is interference marred. I have to ascertain the SINR at the Access Point (AP) for the NOMA users. A sub-channel is allocated to various users and ...
Khurram's user avatar
0 votes
1 answer
24 views

simulating directional interference to evaluate model performance

I have a model for audio processing. The model receives as input, a source, convolved with a room impulse response (RIR). I would like to test the performance of the model against inputs containing ...
havakok's user avatar
  • 682
0 votes
0 answers
18 views

Interference in decibles

A is transmitting a signal to point B . But in this process A is creating an interference at point C. So if the distance between point A and point C decreases the interference will increase. My ...
user7341333's user avatar
1 vote
0 answers
53 views

What kind of signal reppresents this Power Spectral Density?

I'm sampling 8 bioelectric signals with a embedded board which use an 8-channels ADC (AD7175-8). My sampling rate for every single channel is about 6250 Hz. When move the analysis in the frequency ...
thoraz's user avatar
  • 139
0 votes
1 answer
109 views

Equalizers with low data rate systems

In case of using equalizers with ZigBee systems, what type of fading does the channel show, flat or frequency selective, fast or slow? Is the inter-symbol interference (ISI) problem encountered in ...
Noha's user avatar
  • 93
1 vote
1 answer
745 views

CFAR Detectors and Interference

Constant False Alarm Rate (CFAR) is an automatic thresholding technique. It's situated after the FFT processing in other to detect target peak. This probability of detection depends on clutter and ...
Issa's user avatar
  • 127
1 vote
0 answers
114 views

Is there a situation when maximizing SNR doesn't also maximize probability of detection?

The problem I'm working on is signal detection of a radar signal, but I suspect this problem shows up in many different branches of signal processing. Background: From [1], the factor $I_f$, by ...
Robert L.'s user avatar
  • 2,222
1 vote
2 answers
1k views

Inter Symbol Interference (ISI) / Equalization in Digital Signal Processing

I am studying the OFDM system and before to start I have decided to study the main concepts of modulation. And I have spent yet a lot of time to understand the concept of an equalization to reduce ISI....
LenaPark's user avatar
0 votes
2 answers
836 views

Ultrasonic Interference with Electromagnetic Waves?

I am currently working on ultrasonic frequencies (20 kHz-60 kHz). According to a news snippet I found: The state government has also tried employing ultrasonic guns that can scare monkeys away and ...
Mahip's user avatar
  • 1
0 votes
4 answers
188 views

how to eliminate interference in the same center frequency

I'm trying to receive an ASK signal in the 433 MHz center frequency with a bandwidth of 100KHz. I'm using a CC1101 transceiver connected to a Raspberry Pi GPIO ports. However, there is an intermittent ...
Natalia Molinero Mingorance's user avatar
-1 votes
1 answer
100 views

how to guess what the interference source it could be

At work, we are in an industrial area, and there is always a signal that I receive inside my office which interferences with my tests. This signal is in the 433 MHz and when I see the spectrum, ...
Natalia Molinero Mingorance's user avatar
0 votes
1 answer
37 views

Is there some literature to understand finite state ISI channel?

I am trying to understand channels with memory, where the state of the channel gives the past input information. I want to delve further into capacity for channels with ISI. I came across a ...
Userhanu's user avatar
  • 181
4 votes
1 answer
883 views

Cross-correlation, sharp peak at 0?

First of all, I have to stress that I am not a professional of coding, no more than a professional of signal processing. I am a chemist that happen to be working on a project involving both. So in ...
Trion's user avatar
  • 87
2 votes
1 answer
4k views

Precursor ISI - causality violation?

Today, in my lecture on intersymbol interference (ISI), there was a discussion on postcursor ISI, and precursor ISI. Postcursor ISI is caused by the past bits, whereas, precursor ISI is caused by the ...
Anjan Kumar's user avatar
1 vote
1 answer
116 views

What is the best way to show beamformer enhances signal of interest over interference

I need to study an array's performance in terms of interference. I have already analyzed the array's white noise gain which is the ratio of output and input SNR of the beamformer i.e. $\rm{SNR_o} / {...
BoltzBooz's user avatar
  • 159