5
votes
Accepted
The power of signal processing when faced with hardware constraints
That's a very broad question, but I'll give it a shot.
1 . ... how much could signal processing actually do to help us here ? ...
That's highly dependent on the specific problem. Sometimes a lot, ...
- 30.7k
3
votes
The higher the sidelobes of a signal frequency spectrum, the greater the "cross-talk" between transmission channels
Convolution theorem states convolution in time domain is the same as multiplication in Fourier domain, also the multiplication in time domain is a convolution in Fourier domain.
So when you truncate ...
- 1,306
3
votes
CFAR Detectors and Interference
The "best" detector is a highly subjective subject, and there is (in my opinion) not a definitive answer here. I work in radar processing and I've used everything that you've mentioned in one form or ...
- 803
3
votes
Accepted
The raised cosine spectrum and Nyquist's criterion for zero ISI
The point that you are missing is that $P(f)$ as used in Eq.$(4.59)$ is no longer the minimum-bandwidth function that is nonzero only for $f \in [-W,W]$ but something that is nonzero for $f \in [-W(1+\...
- 18.7k
3
votes
Accepted
How to remove power line interference?
Well, if I were doing this from scratch, I would do this with biquad notch filters with very high Q and adjustable coefficients. Two or three of them with frequencies that are harmonically locked. ...
- 16.7k
2
votes
how to eliminate interference in the same center frequency
First of all, the CC1101 supports a number of other frequencies, so as a trivial solution, you can switch to using those.
The other thing that you can do at the RF module level is to "shift" your ...
- 10k
2
votes
Accepted
Precursor ISI - causality violation?
Every symbol in the channel will be affected by ISI from previous symbols and next symbols. To understand this you must notice that there's a propagation delay from transmitter(TX) to receiver(RX). ...
- 942
2
votes
Ultrasonic Interference with Electromagnetic Waves?
Not sure about up into the GHz ISM bands, but unfiltered, unshielded switching power amplifiers and power supplies running at high audio frequencies can generate and radiate harmonics well into the RF ...
- 33.8k
2
votes
Can the intelligence message of an FM signal be cross-modulated to another center frequency due to non-linearities?
Yes and no, it can't be intermodded onto another SIGNAL, but it can be intermodded onto another CHANNEL. For example, if you are monitoring 144 MHz, an FM signal on 145 MHz and on 146 MHz CAN, due ...
- 21
1
vote
gmsk modulation: ISI reseach
Please see this post for which I have copied the primary figure here below:
This is a very simple way to implement a GMSK transmitter with partial response signaling. The Data is represented as ...
- 36.1k
1
vote
Alg for identifying any temporal interfering signal
Run short term fourier transform with proper windowing and frame size
Calculate power for each frame in each band.
Calculate running mean and standard deviation (in each band)
Compare mean and ratio ...
- 30.7k
1
vote
Inter Symbol Interference (ISI) / Equalization in Digital Signal Processing
If the channel just adds noise and does not cause any distortion (as in the first figure), you can design the transmit filter $g(t)$ such that, when combined with its matched filter at the receiver, ...
- 79.2k
1
vote
Ultrasonic Interference with Electromagnetic Waves?
You're right, acoustics is temporal change of air pressure, whereas radio is electromagnetic waves. These are independent phenomena.
However, electromagnetic waves do behave differently based on the ...
- 25.7k
1
vote
Detecting and removing interferences from a signal
I'd recommend using a median filter to smooth your signal. A median filter will get rid of the outliers, or the spikes in your signal. The length of the median filter will have to be determined by how ...
- 371
1
vote
Accepted
Filter for DC component in FFT2 of image
When processing noisy data, it is usually beneficial to filter high frequencies, this can be done with a small kernel as shown in answer by Dan Boschen.
Also if your data has an envelope it will give ...
- 1,463
1
vote
Fringe movement analysis to extract displacement
Answer to: Is there an easier way to count fringes?
I synthesized an image to resemble your image with
...
- 1,463
1
vote
Accepted
Can the intelligence message of an FM signal be cross-modulated to another center frequency due to non-linearities?
I don't see any obvious issue with the OP's reasoning except to clarify that the cross-modulation is is not onto another FM signal but onto another FM channel with caveats on intelligibility. Below I ...
- 36.1k
1
vote
Accepted
How to compute total interference power at receiver antenna
The proper way to sum the interference is to sum them in power, unless they are coherent, in which case they would sum in magnitude. Coherent would mean the interference are all at the same frequency ...
- 36.1k
1
vote
Accepted
To implement successive interference cancellation (SIC) process, should the receiver know the power allocated to each symbol?
Yes, one would require to know the power of other users. There are two options, the network can either signal the UEs this information in a control frame or the UEs need to estimate the power of the ...
- 2,542
1
vote
SINR is 3-tap zero forcing filter
The ZF equalizer, $f[n]$, is a filter (I'm assuming a FIR filter) that tries to force, $f[n]*h[n]$, to be $\delta[n-d]$, where $d$ is the sample delay introduced by the filter (I choose $d=2$ below) ...
- 2,687
1
vote
Accepted
5G NR Network Collision Avoidance
IEEE 802.11 is not related to 5G NR, so consideration for WLAN networks following 802.11ay don't apply to cellular infrastructure.
I don't know what "ad-hoc" modi 5G NR brings; I don't think it's any....
- 25.7k
1
vote
Accepted
simulating directional interference to evaluate model performance
You do need to be careful how exactly you define the SNR. I think you are actually talking about SIR (signal to interference ratio). The way you describe it, it sounds like you plan to just compute ...
- 2,687
1
vote
how to eliminate interference in the same center frequency
Have a model for the interference, if you can hopefully get the idea of amplitudes of the interference (you could get the idea using the following):
Since you mention that interference occurs at ...
- 2,542
1
vote
What is the best way to show beamformer enhances signal of interest over interference
There's an article that defines some measures for blind source separation that I used to measure the output of a beamformer Performance Measurement in Blind Audio Source Separation. Vincent E., ...
- 114
1
vote
how to guess what the interference source it could be
I read about it and I found out that it could be our alarm system because the power is high and the transmission is constant so I run the technical support and they confirm, so I guess, problem solved....
1
vote
Is there some literature to understand finite state ISI channel?
you can also start by "signal processing for everyone" for Gilbert Strang, it's brief and easy to understand. Then you can go with Proakis, "Digital Communications". also there are very good online ...
- 1,046
1
vote
Accepted
Cross-correlation, sharp peak at 0?
Since your shift is going to be in the 0-5 pixel range, I am assuming you are going to want a method that gives you sub-sample accuracy.
I have a suggestion for you to try. Read my article ...
- 6,875
Only top scored, non community-wiki answers of a minimum length are eligible