5 votes
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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, ...
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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 ...
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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 ...
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3 votes
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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+\...
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3 votes
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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. ...
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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 ...
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2 votes
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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). ...
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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 ...
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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 ...
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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 ...
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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 ...
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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, ...
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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 ...
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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 ...
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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 ...
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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 ...
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1 vote
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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 ...
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1 vote
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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 ...
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1 vote
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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 ...
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  • 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) ...
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1 vote
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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....
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1 vote
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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 ...
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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 ...
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  • 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., ...
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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....
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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 ...
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1 vote
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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 ...
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