Questions tagged [signal-detection]
The signal-detection tag has no usage guidance.
451
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What is "overshadowing" or "superposing a signal"?
The term "overshadow" is used heavily in this paper https://rahbari.csec.rit.edu/papers/globecom2022_Dongre_Implicit.pdf
I'm confused as to what it means to "overshadow" a signal. ...
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Classification of signals from the sensor
First of all, I want to say that my knowledge of signal processing is very limited.
So I need to separate the signals into two classes. Here is a picture that shows several dozen signal observations ...
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Detect active channel used in a lora network
I am trying for quite some days now to detect which channel was used for a transmitted LoRaWAN frame.
For those who are not familiar with lora: LoRa makes use of the CSS modulation technique, which is ...
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125
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creating range map doppler
I'm trying to create a range doppler map for a chirp signal which has the following parameters:
pri = 5e-6;
pw = 2e-6;
CPI = 0.5e-3;
B = 100e6;
f_c = 40e9;
for one ...
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Signal Detection in Noise
I have known pulses, e.g. $A\exp(-\frac{t}{\tau})\cos(\omega t)$, but they are "hidden" in additive (let's say Gaussian) noise and it is not possible to predict when such events will occur. ...
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LabVIEW Driver for Princeton Applied Research 5302 Lock-In Amplifier
I'm working in a lab that uses a Princeton Applied Research 5302 Lock-In amplifier. The device has a GPIB port, and I wanted to interface the device with LabView. Does anyone know where to get a ...
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Can Autocorrelation be used to Differentiate Signal Quality (High, Medium, Low, Very Low) for Periodic Signals?
I'm working on a project to classify the quality of periodic signals into four categories: high, medium, low, and very low (noisy). I was initially exploring autocorrelation as a potential feature for ...
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How can I calculate the probability of detection and false alarm rate of a correlation result assuming a given SNR threshold in AWGN?
I am transmitting an LFM chirp with fixed bandwidth $B$ and sample rate $f_{s}$, containing $N$ samples. The chirp is windowed with a Kaiser window, which generally has constant $\beta$ but can vary. ...
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Algorithms for signal shape detection
I have a discrete signal shape which I am trying to find in accelerometer data. I want to compare at least two methods. First one is of course correlation, I calculate peak value of 10 experiments ...
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Excitation signals for system identification - Applications
I have a practical question regarding the various applications of excitation signals in identifying Linear Time-Invariant (LTI) systems. Specifically, I am curious about the usage of the following ...
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Why is my target showing up with a non-zero centered velocity? I captured this data using the IWR6843A0P using a stationary corner reflector
I need help understanding what I should do to determine why my target is showing up in my Range doppler map with a non-zero centered velocity when I captured my measurement using a stationary corner ...
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Program to compare output and input streams to verify volume
I'm trying to wright a program to compare, two sound signals, output (speakers) and input (mic) streams and verify/adjust the volume. I'm using Microsoft Visual Studio C# forms project with the ...
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Is this better detection than Matched Filter and Gaussian noise cancellation technique for SONAR data?
The code below generates one sinusoid and considered as known signal. One needs to find the location of the signals under additive Gaussian noise.
The known signals is comprise of the sinusoids with ...
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How to distinguish a good sine wave from a distorted one from a solenoid signal?
I have a rotating magnet in front of an iron-core solenoid. When the magnet rotates, it would reduce speed, and then it will stop spinning and just sway back and forth. I want to know when it stops ...
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Complex Gaussian distribution in snapshot model
In Chapter 5 of the Optimum Array Processing by Harry van Trees [1], the formula of the complex Gaussian distribution appears very different from the formula that is used elsewhere in the same book ...
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do closer peaks Leak more to each other (spectral leakage in FFT)
I am familiar with the spectral leakage problem in FFT due to a rectangle window for a sin signal giving two peaks that leak to each other. My question is will the leakage to the frequency bins near ...
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Calculation of a position from the angles of arrival
For locating a target by TDOA (Time Difference Of Arrival) with $3$ stations we have the Chan method which gives an exact solution of the position.
I keep the $3$ stations but instead of measuring the ...
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A question about GLRT
I did an experiment of detecting an unknown DC level in AWGN with unknown variance according to Steven M Kay's Detection Theory. For one set of samples $x(i)=a+n(i)$, the GLRT is $T_x=N\log(\hat{\...
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error on angle of arrival
I have $2$ sensors allowing me to measure angles of arrival. These sensors are a distance $d$ ($d \simeq 10$ m) apart and the target to be located is at a distance $R$ with $d<<R$. In the ...
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597
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How to simulate multiple targets in FMCW radar simulation in python?
I have simulated a FMCW radar for a single stationary target, now the next step in my project is to simulate multiple moving targets. For this I had thought of using doppler shift to show a difference ...
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Related to Additive white Gaussian noise (AWGN)
In my research work regarding wireless communication, I came across many research papers wherein AWGN is assumed to be modelled as "complex Gaussian with zero mean and unit variance".
I ...
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How to implement maximum likelihood (ML) detector in MATLAB?
Consider the MIMO system which has $N_t$ antennas at transmitter and $N_r$ antennas at receiver and uses Generalized space shift keying (GSSK) modulation. The received signal is given by:
$$Y = H X + ...
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How to express random signal in MATLAB which is transmitted from transmitter to receiver
I am trying to model a random transmitted signal between transmitter (source) to receiver.
Specifically, the transmitter has $N_s = 1$ antenna and receiver has $N_r = 2$ antennas.
My query is that I ...
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Sinus Pattern analysis
i have 1000 data which range between 50 and 180 ( heart BPM data in a day) how can i measure its similarity to a Sinus pattern?
for example, for 20th recorded data (for example it is 60BPM), evaluate ...
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Is there a reason why wavelet in continuous wavelet transform are symmetric?
I have looked at several packages to do continuous wavelet transform (cwt), and the usable wavelet families that are available are always symmetric. Is there a reason for that? The kind of signals I ...
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What books describe convolutional neural networks for DSP?
(note: I read the site policy and meta questions about whether such a question is ok. I will be specific)
I am looking for books that specifically cover using convolutional neural networks (CNN) for ...
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125
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Onset time determination of fast pulse
I am looking for the most precise way to determine the onset time of a
very fast pulse sampled at 5 GHz coming from a physics detector.
Here is an example of my signals:
I already tried different ...
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Phase rotation compensation in AOA
We are using $4 \times 4$ corehw antenna array with nrf52833 mcu as the receiver and nrf52833 as transmitter. When working on AOA Direction Finding, we found that each element in the antenna array has ...
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Which probability density functions to use in a likelihood ratio test for the radar detection problem?
I am trying to understand the radar detection problem in the form of the generalized likelihood ratio test and am having a little trouble with understanding the noise distributions. Perhaps this will ...
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Understanding the modulation concept
In my research work, I came across the concept in the paper
Y. Hu, P. Wang, Z. Lin, M. Ding and Y. -C. Liang, "Machine Learning Based Signal Detection for Ambient Backscatter Communications,"...
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How to evaluate pairwise error probability and detection in presence of gaussian noise?
I am reading Digital Communication Systems by Simon Haykin and I am stuck at one point.
Consider a two-dimensional signal space that has a message constellation of four points, given by $s_1,s_2,s_3,...
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Is using cross-correlation with a reference wavelet a good approach for vibration detection?
This is my first time actually applying signal processing to a real problem.
I'm trying to monitor some equipment for vibrations. The vibrations aren't constant but occur at some point in time - I've ...
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Optimum Measurement of Sine Wave Amplitude in Noise
There are many related questions posted about estimating sine wave parameters, and this one is closest: Measuring amplitude of a pure sine wave of known frequency close to the noise floor, but none ...
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Measuring amplitude of a pure sine wave of known frequency close to the noise floor
What I want to ask you comes from a place where I can play with all the parameters as much as I want (I can measure as long as I want and as fast as I want, as well as change sensor/ADC).
The signal ...
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Identify abrupt changes in an audio waveform
I have an audio file which was created by substituting multiple speech segments into an original utterance.
I want to find the timestamps where such substitutions happened, so I guess that one thing I ...
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Understanding Maximum likelihood detector expression?
Consider the MIMO system which has $N_t$ antennas at transmitter and $N_r$ antennas at receiver and uses Generalized space shift keying (GSSK) modulation. The received signal is given by:
$$Y = H X + ...
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Issue with SNR and SINAD Measurement using Matlab Functions in specific cases
I have a MATLAB code in which I need to calculate the SNR and SINAD of received signal at known frequency (assumed as tone signal). The issue is that sometimes the power at that frequency is lower ...
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148
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Finding start point of a curve
I'm currently working on a project where I have to measure the latency of a given system.
Below you can see a exemplary image which shows the input pulse (green) and the response (blue).
In order to ...
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Best 'SNR-like' detection statistic for time series signal in the wavelet domain?
What is the best way to define a detection statistic for a time series event trigger generator, which computes the wavelet transform of some time series data? I want such quantity to be similar to a ...
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Practically Calculating Cramer-Rao Lower Bound
What is the method to compute Cramer-Rao lower bound for a particular application. For example I have an application in which FFT of an incoming signal is performed to get a Coarse estimate and then ...
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253
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Should we use Maximal ratio combining and an equalizer together?
I have confusion on MRC(Maximal Ratio Combining) method which I would like to clarify. An example is where I have 1 transmit antenna and 4 receive antennas. The concept of MRC is to combine all the ...
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Energy ratio of signal
What is the energy ratio of signal at frequency domain?
What is its mathematical formula at frequency domain and what can stand for?
I found it in this paper
https://www.researchgate.net/publication/...
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Performance Effects of Dropping ADC Least Significant Bits before DSP processing (Besides the Obvious)
What would be the effect of dropping LSBs of an ADC on the performance of a DSP system apart from the obvious reduction in dynamic range. For example if there is a 14 bit ADC and only 10 bits are used,...
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Detector for vector-valued signals
I'm trying to find the optimal probability of detection/false alarm for the following detection task. Given $N$ signal samples with $d$ dimensions (independent channels) each, assign the samples to ...
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Can we detect WiFi from Spectrograms using signal processing?
I'm looking for some suggestions on detecting wifi using spectrograms (abs magnitude only) . My project involves a wifi driver which outputs a spectrogram whenever it scans the channel .
Can we use ...
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Amplifier Placement in a Wireless Receiver
In the context of wireless receiver system design, what is the optimum choice of amplifier placement? Should the received signal be amplified first then filtered or should it be the other way round?
...
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857
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How to decide whether a recording contains a signal of interest?
I am currently implementing an acoustic communication system in Matlab. For synchronization purposes, every transmission contains an upchirp preamble. The receiver uses cross-correlation to find the ...
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Issues with playing and recording a square wave sound on the same PC
I am learning signal processing. For a hobby project I wanted to transmit and record a simple ASK signal via my soundcard, to see if I can write code to recover the sent data. After playback and ...
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SNR ratio in radar for stationary targets
Is there a mathematical model which provides relationship between the Signal to Noise Ratio in radar measurements and velocity/range of targets. i.e.
How SNR varies with the speed of targets?
How SNR ...
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How to synthesise an approximate 'pulse' waveform from an observed section of a similar waveform
Following on from my previous question, kindly answered by @peter-k, I have a related one...
I have, in a small interval $a \leq x \leq b$, a function $q(x) := q(x;\rho,\gamma)$ whose exact form is ...
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