# Questions tagged [signal-detection]

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### AWGN continous time channel + colored noise

I'm working on an exercise but I'm stuck at the question where the noise becomes colored, can someone help me ? Let $\{\psi_1(t) = \mathbf{1}\{t \in [0,1)], \psi_2 = \mathbf{1}\{t \in [1,2]\}\}$ be an ...
236 views

### Filter type selection for signal envelope detection

Working on a signal envelope detection code in Matlab in which an RF signal envelope is to be created. The flow is such that filtering is performed according to the detected presence of a signal in a ...
43 views

### Why would the emitted signal from repeating binary data over a wire appear at a frequency lower than the bit frequency?

I have a signal over which binary data is transferred over wire in a repeating 10 bit format. The wires that the data is send over are CML, DC coupled 3.3V twisted pairs, and the protocol of encoding ...
8 views

### Preamble detection Threshold calculation [duplicate]

can anyone recommend a good article where I can read how to correctly calculate the threshold for detecting the presence of preamble at the output of a matched filter?
15 views

### Related to SNR when the channel is in the form of vector and matrix

In my system model there is a sensor (transmitter) with $M$ antennas and receiver with $Q$ antennas. The received signal expression is $y_q(n) = (h_q+\textbf{f}_q\textbf{G}$)$s(n)$+$w_q(n)$----(1) ...
18 views

### How to detect that a waveform is of the same type if it has a different frequency (Example: Sinwave with 2Hz and another with 10Hz)?

I am trying to detect whether a received waveform is a Sinusoid, Square Wave, or any other. How should I go about doing this, if the signal frequency can be different every time? I have looked online ...
48 views

### Optimal methodology for analysis of noisy 3-dimensional (x,y,z) vibrations data

Details I have x, y and z data of some vibrations and a timeline of corresponding events that caused these vibrations. I want to analyze how events and vibrations are related, so that it can be stated ...
47 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 ...
563 views

### A Machine Learning Based Algorithm as an Alternative to the Matched Filter

Consider we have to detect a known signal added with Gaussian noise. In this scenario, the matched filter is known to be an optimal filter for SNR. The question: is there any machine learning ...
72 views

### About the process to convert basedband signal into passband

Theoretically, the passband $y(t)$ signal equivalent into baseband signal $x(t)$ is given by: $y(t) = \Re \begin{bmatrix} x(t) e^{(-i2 \pi f_ct )} \end{bmatrix}$ where $\Re$ represents the real part. ...
89 views

### Algorithm to detect tapping-events in an XYZ-signal of an accelerometer

How do I find signal-sections with a re-appearing particular shape in a noisy signal? I want to detect tap-events (user tapped a device) using the 100Hz 3-axis accelerometer data provided by the ...
39 views

### Advantages of Chan's method over the Kalman filter

For a 3-receiver tracking system. Chan's positioning method gives an exact solution to the location problem. However in the literature, I saw that one could use the extended Kalman filter which is ...
58 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 ...
185 views

### Methods to increase FFT time resolution without lowering FFT size

It is known that in FFT time and frequency resolution are inversely related if FFT resolution is increased then time resolution will decrease. However is it possible to overcome issues in time ...
24 views

### Detecting whether the signal is increasing intensity or decreasing intensity

I am trying to determine whether the signal is increasing intensity, decreasing intensity, fade-in, fade-out or peak using an audio file. The graph has an x-axis with time and a y-axis with the data. ...
22 views

### Calculate number of buzzs and their duration

I'm trying to calculate the number of buzzs and their duration from a buzzer. I'm working with python and scipy lib and the short time fourier transformation capturing the audio with a microphone. To ...
79 views

### Extract specific frequencies or wavelength out of a recorded audio sound

I have a audio recording piece of an environment that contains multiple sounds, is there a way to separate the different frequencies or wavelengths of this signal with Python or matlab?
35 views

### How whip antenna even work if they don't have two terminals? [closed]

I understand antenna should have two terminals to emit radio waves like this: But in whip antenna it has only one pointy terminal, how does it work?
54 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 ...
37 views

### localization with TDOA under Doppler shift

In a localization system, I use the TDOA (Time Difference of arrival) method. The transmitter is moving at a speed v and its communication signal is received on 3 receivers at different times. For a ...
1 vote
199 views

### Conversion from phase noise to EVM

I have a phase noise specification for a digital QPSK transmitter at 8GHz (symbol rate 50 Mbaud). From that specification I am able to compute the RMS jitter in radians (47 mrad or 934 fs using the ...
62 views

### Square Root MMSE

Could anyone please explain how to perform the derivation of the square-root MMSE equation using an extended channel matrix H (as it is said in the "A LOW COMPLEXITY SQUARE ROOT MMSE MIMO DECODER&...
50 views

### How to detect a long deceleration phase in a signal?

Given the following signal, I would like to keep only the deceleration phase in orange. I have no idea whether there exists techniques to do that or not. I imagine that I can smooth the signal, ...
1 vote
211 views

### Range-Doppler Matrix Cells

I am working on developing an understanding on range-gates and the size of each cell. I haven't had much luck in finding information in how the matrix in the image below is generated, so I have some ...
53 views

94 views

### Expected value of a quantized noisy signal

I am given a noisy signal $y(t) = x(t) + w(t)$, where $x(t)$ is my desired signal and $w(t)$ is the noise. In my scenario, the noise is very strong, much stronger than the desired signal $x(t)$. ...