Questions tagged [signal-detection]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
1 vote
1 answer
30 views

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 ...
user avatar
  • 15
3 votes
1 answer
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 ...
user avatar
  • 312
0 votes
2 answers
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 ...
user avatar
0 votes
0 answers
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?
user avatar
  • 35
0 votes
0 answers
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) ...
user avatar
  • 17
0 votes
1 answer
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 ...
user avatar
0 votes
0 answers
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 ...
user avatar
0 votes
0 answers
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 ...
user avatar
7 votes
2 answers
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 ...
user avatar
  • 601
0 votes
1 answer
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. ...
user avatar
  • 61
2 votes
1 answer
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 ...
user avatar
  • 121
2 votes
0 answers
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 ...
user avatar
0 votes
0 answers
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 ...
user avatar
2 votes
4 answers
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 ...
user avatar
  • 312
0 votes
0 answers
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. ...
user avatar
0 votes
1 answer
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 ...
user avatar
  • 13
0 votes
3 answers
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?
user avatar
  • 1
0 votes
1 answer
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?
user avatar
  • 3
-1 votes
1 answer
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 ...
user avatar
-1 votes
1 answer
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 ...
user avatar
1 vote
1 answer
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 ...
user avatar
  • 13
0 votes
1 answer
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&...
user avatar
  • 35
0 votes
1 answer
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, ...
user avatar
  • 125
1 vote
1 answer
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 ...
user avatar
3 votes
1 answer
53 views

Is it possible to detect the sparse vector based on a non-invertible matrix

Given a non-invertible matrix $X \in \mathbb{R}$, let's say that matrix is, e.g. : $X = \begin{bmatrix} 0.7500& -0.2500 &-0.2500 & -0.2500 \\ -0.2500& 0.7500& -0.2500 & -0....
user avatar
  • 61
2 votes
2 answers
129 views

The transmission distance of a signal

I am no professional in this area so please forgive me if this question is too immature. And thanks in advance for any help and information. I want to know how to calculate the transmission distance ...
user avatar
1 vote
1 answer
39 views

Cross-correlation for delay estimation in acoustic signals

iam doing BPSK transmission and receiving with acoustic signals, in order to get my actual signal from my received signal I am using xcorr in matlab to find peak point of alignment and getting my ...
user avatar
0 votes
1 answer
152 views

Periodic signal detection algorithms?

I am currently working on pulsar signal periodicity detection. Most of the literature which i studied used traditional FFT (Fast Fourier Transform) or (Epoch Folding) techniques to find the ...
user avatar
  • 1
1 vote
1 answer
48 views

Beep Signal for Latency Calculation

I want to play audios on two mobiles with sync. But mobile phones are not in sync. I am trying to find two Mobile phones playing latency so I can pad latency on each phone so they can play together. ...
user avatar
0 votes
0 answers
52 views

BPSK(10) and chip rate

I am doing some research have come across signals listed as having the in-phase channels modulated with BPSK(10), etc. I understand the concept of BPSK - Binary Phase Shift Keying, and know the 10 is ...
user avatar
1 vote
4 answers
287 views

What algorithm can I use to compare two signals' similarity?

Suppose I have two time series (measuring the gyroscope data from two body sensors — A and B). I somehow need to evaluate whether the signal B is "following" the signal A — that is, how ...
user avatar
-1 votes
1 answer
126 views

Faster way to Implement a CFAR (window average) Threshold

I implemented a version of a CFAR average in MATLAB but it's 'slow' and I need to speed it up. I included the pseudo code and logic below. I used a nested for loop to calculate the moving average but ...
user avatar
  • 1
3 votes
1 answer
124 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 ...
user avatar
0 votes
0 answers
54 views

Is this a valid way to calculate SNR?

If I calculate 1.) the average power of a signal, $P_s$, in terms of the average energy of the signal, $E_s$ and take it as a constant over a given period of time, $T_s$, as $P_s=E_s/T_s$ where $E_s$ ...
user avatar
1 vote
0 answers
67 views

Fisher Information Matrix for sinusoidal signal under multiplicative noise

Consider observations ($y$) of a sinusoidal wave with multiplicative noise ($v$) where we are estimating unknown frequency ($\omega$) and unknown initial phase ($\theta$). We can write this system ...
user avatar
  • 11
0 votes
0 answers
47 views

Optimal Combination of received signals from two antenna

I really appreciate an answer or any hint how to approach this problem: Problem: A receiver has two antennas. The first antenna receives $Y_1=hx+n_1$, where $x\in\{-A,+A\}$, $h$ estimated channel, and ...
user avatar
  • 1
0 votes
2 answers
68 views

Working out EIRP

There is a debate about the proper way of how to calculate the EIRP, so I need your help on which method is wrong and why please! Let's suppose we have the following: Output power: 165 W Reflected ...
user avatar
0 votes
1 answer
127 views

Does Maximum Likelihood detector (QAM symbol detection) enhance BER?

Assuming QAM symbols (or OFDM system) with AGWN, I found that the use of ML detector does not enhance the BER but only enhances (reduces) error vector magnitude (EVM) because of symbol decision and ...
user avatar
1 vote
1 answer
51 views

Differentiate betwee sibilant "sssh" voice sounds and instruments like hi-hat?

How would I differentiate betwee sibilant "sssh" voice sounds in a music track and a similar sounding instrument sounds like hi-hat or cymbals?
user avatar
  • 472
0 votes
1 answer
70 views

Number of antenna to perform MUSIC algorithm

When the MUSIC algorithm is used for direction of arrival (DOA) estimation it can identify up M-1 signals, where M is the number of array elements. MUSIC can also be used for spectral frequency ...
user avatar
1 vote
1 answer
61 views

What is meant by "omega suppression" in a lock in amplifier context?

Can anyone explain what is meant by "Omega suppression" in lock-in amplifier discussions or specifications. I'm usually very good at web-searching, but have been unable to find anything that ...
user avatar
0 votes
3 answers
164 views

There is an implant in me, is there a way to identify the frequency it is receiving signals on?

There is an implant in me, is there a way to identify the frequency it is receiving signals on? I don't want to share the evidence and my reasoning for believing there is an implant in me, you can ...
user avatar
1 vote
0 answers
24 views

Application of the spherical Radon transform property in tomography

Let function $f$ be even and continuous on the unit sphere $S^n$. Let $R$-be a spherical Radon transform. There is a known property: $R(f^n)=f$ whenever $f$=constant. What would this property mean in ...
user avatar
1 vote
3 answers
310 views

Is there processing gain for FMCW using heterodyne-style receiver as opposed to matched filter?

Beat signal of a single target will be a sinusoid in the idealized world, so theoretically the signal processing gain of an FMCW pulse correlated with Tx waveform in this way should be analogous to ...
user avatar
-1 votes
2 answers
70 views

Beat detection and calculation of start time

Beat detection I'm trying to create a beat detection function of a machine producing in the language R. I hosted the audio file on dropbox. It was recorded with 16 bit and 16kHz. I started with some ...
user avatar
  • 1
1 vote
1 answer
81 views

Ultrasonic TDoA / ToA Measurement?

I am trying to make an ultrasonic flowmeter. The device has two ultrasonic tranducers (resonance frequency of about 200kHz) that sample one ultrasonic signal in the upstream directon and then ...
user avatar
0 votes
0 answers
34 views

signal construction based on cross correlation

Consider we have to design a signal $ \mathbf{x} \in \mathbb{C}^{1_{} \times N_{\mathrm{}}} $ that needs to have the lowest correlation with an unknown signal $\mathbf{y} \in \mathbb{C}^{1_{} \times ...
user avatar
  • 45
5 votes
1 answer
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 $x(t)$. ...
user avatar
  • 2,288
0 votes
1 answer
85 views

Detection of a Pulse pattern with Matched filter

I am working on a hobby transmitter-receiver project. Presence of 4 pulses in T seconds is regarded as 1(not any number of pulses, should match below): lack of pulses during that T seconds is ...
user avatar
  • 249
0 votes
2 answers
67 views

How does Signal Analyzer measure EVM

I understand that EVM is a root mean square of error vectors. If I have transmitted symbols and received symbols (once equalized), taking a root mean square would give me EVM. I believe this is actual ...
user avatar
  • 134

1
2 3 4 5
9