Questions tagged [signal-detection]

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1answer
33 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 ...
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0answers
8 views

Finding the wiggles pattern in the original dataset. (Wiggles appear after performing division by another dataset)

I have multiple measurements regarding scientific observations. The problem is that there is a subtle noise pattern caused by the instrument - the wiggles. These wiggles are invisible when looking at ...
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Python library for audio filtering, gating, and sound/silence detection

Is there a Python library that can do all of the following?: Band-pass filter; Noise gate, with different parameters set for different segments of audio file; Detect and count the number of discrete ...
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1answer
43 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 ...
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3answers
146 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 ...
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0answers
20 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 ...
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3answers
90 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 ...
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1answer
26 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 ...
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0answers
28 views

Signal “seasonality” detection

I am wanting to do a seasonality detection on a signal, but am struggling big time to find a solution. I have tried several different things, including statsmodels STL/seasonal_decompose. It seems ...
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1answer
46 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 ...
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0answers
30 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 ...
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1answer
52 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 $x(t)$. ...
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1answer
39 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 ...
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2answers
35 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 ...
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1answer
79 views

Sub-Band Extraction Techniques for Complex (I/Q) Signal

There is an application which processes Complex I/Q signal of 100 MHz bandwidth and it is required to extract independent sub-bands from this bandwidth at different center frequencies and bandwidths. ...
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1answer
42 views

mathematical expression to detect modulated data within a vector

Assume I have such modulated data which is, for example, $x=0.7+0.7i$. That modulated data is encapsulated in a vector as below: OR where $c$ is any constant number, let’s say, for example: $c=0.7$ ...
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1answer
121 views

Determining the average probability of error

I'm trying to solve the following problem: In a binary PAM system, the input to the detector is $$y_m = a_m+n_m+i_m$$ where $a_m = \pm1$ is the desired signal, $n_m$ is a zero-mean Gaussian random ...
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1answer
29 views

What is the difference between object detection and target detection? Are they the same thing?

I was reading some articles regarding object detection and target detection and have a hard time understanding the difference between object detection and target detection. i want to know whether they ...
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1answer
257 views

Autocorrelation function of a triangular wave

I am interested to find the analytical expression for the autocorrelation function of a signal that comprises triangular pulses. I have followed the derivation in "Statistical Theory of ...
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0answers
24 views

Best way to compare audible alarms

I'm working on an alarm recognition program in MATLAB in which multiple reference audio samples of different alarms would be recorded. Afterwards, the program would sample every so often and compare ...
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1answer
34 views

Property of the trace and expectation

I'm reading the paper Model-Driven Deep Learning for Joint MIMO Channel Estimation and Signal Detection by Hengtao He, Chao-Kai Wen, Shi Jin, and Geoffrey Ye Li on Orthogonal Approximate Message ...
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0answers
37 views

What does minimum entropy deconvolution mean?

I want to use minimum entropy deconvolution method to analyse vibration signals to detect bearing characteristic fault frequencies. I am confused as to what the meaning or exact definition of minimum ...
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1answer
109 views

Signal Estimation after detection Part 2

I have a binary information source signal $s(t)$ that is corrupted by additive White Gaussian noise $w(t)$ at a particular SNR. The received signal is: $$x(t) = s(t) + w(t)$$ Then I have created a ...
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1answer
97 views

Doubt: Signal detection in noise Part 1

I have a confusion regarding the matched filter detection technique. I have a binary information source signal $s(t)$ that is corrupted by additive White Gaussian noise $w(t)$ at a particular SNR. The ...
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0answers
43 views

How can I implement a phase detection algorithm with my amplitude detection?

I have been recently working on a signal detection problem in Matlab. At the minute I am detecting signals based on their amplitude, using an m-of-n detector. I am interested in improving the false ...
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0answers
35 views

If a function has slowly varying amplitude and phase what is the bandwidth of the amplitude and phase individually?

I am dealing with time histories that are narrow band with slowly varying amplitude and phase. I wish to extract the amplitude and phase but there is noise on the time history. An example of the type ...
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1answer
22 views

Why use both packet detection and symbol timing offset in WLAN 802.11?

In IEEE 802.11 Wlan, at the receiver side, we first use packets detection algorithm to detect the start of the packets, and then uses fine symbol timing estimation algorithm to find the start of the ...
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0answers
71 views

Blind STBC question

I am working on blind identification of the physical layer parameters of a particular protocol. Everything was going well until I got to the MIMO part. The system contains two transmitter antennas and ...
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0answers
35 views

How can I automate the calculation for P and I coefficients of an FPGA-based digital PLL?

I am working on designing an FPGA-based PLL through an NI myRI0-1900 FPGA and LabVIEW software. I have been able to create a functioning PLL with a PI loop filter, and but I found functioning P and I ...
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0answers
27 views

Finding arbitrary/random repetitive patterns in signals (both self and across two signals)

I am trying to figure out a direction for my research. I need to find random repetitive patterns between two signals and on each individual signal. I have read about FFT and time series-motif ...
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0answers
23 views

Fast ICA : recover the sources with their mean after prewhitening

I want to apply the FastICA algorithm on a certain dataset. I believe the sources the Fast ICA can recover are able to explain other data as well (in similar way to factor analysis). However, I also ...
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0answers
15 views

How to make 2 finger rake receiver to counter intersymbol inferference?

I have to transmit Walsh sequence (spreading codes) modulated with 8 psk with a channel impaired by intersymbol interferences, fast fading . Suppose i have a stream of data for instance 1 0 1 1, 0 0 0 ...
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2answers
120 views

Understanding kurtogram parameters

I am about to understand a kurtogram, and don't understand what means the value of "K" (presented in table 1),or especially why takes values of 1.6 ; 2.6 ; 3.6 etc. Other question is how do ...
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25 views

Complex signals is the same as natural signal

I am working using a sinuasidal signal along with the complex signal derived form it and when I plot the signals spectrum using FFT I got the same spectrum and it turns out that the signals are the ...
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1answer
76 views

two dimensional integration of a trigonometric function

I am working on a detection problem which finally, I have to solve the following 2-D integral: $$\int\limits_{a}^{b} \int\limits_{c}^{d}e^{A\sin(x)\cos(y-B)}\, \mathrm{d}x \, \mathrm{d}y \ ,$$ where $...
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5answers
142 views

Effect of One Sample Latency in Audio Application

I am dealing with a customized processor that has a processing latency of one sample (20.8 microseconds) at 48kHz Sampling rate . What I would like to know is ...does this latency of one sample have ...
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1answer
47 views

Testing if a signal contains a specific previously recorded signal

I am working on a project that converts radio data and transcribes it into text looking for specific types of radio chatter. For most of the time, the radio signal is dead air. Periodically, there ...
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1answer
34 views

Why can't the callee whom I am on call with hear the sound coming from my phone's speaker but I can while my phone is on loud speaker?

I was on call with my friend and have put the phone on loud speaker and I opened youtube,The sound was audible to me but not to my friend. How is it even possible when he can hear my voice but not the ...
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1answer
42 views

Why do we need >= 95% throughput for LTE Sensitivity measurement according to 3GPP

According to 3GPP 36 series for LTE, for LTE Sensitivity measurements we need >=95% throughput. How is this 95% value determined? Why it is not 98% or 88%. Thanks in Advance!
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0answers
14 views

Decoding packets in Long Mode Range

Im using CC1350 launchpad microprocessor of Texas Instrument that I configure my transmitted packets using SmartRF studio Im trying to decode my packets for verifying if my transmitted packet is valid ...
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1answer
45 views

Non Coherent BPSK with no Channel State Information at the receiver

Where or what is the proof for the failure of BPSK in fading channel when we have no knowledge of the fading coefficient $h$ at the receiver in the equation $y=hx+w$, where $x$ is BPSK symbol equally ...
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1answer
33 views

What can be a limit to the maximum possible power of a pilot signal

In practice, what can be a limit to the maximum power of a pilot signal in wireless communication?
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0answers
26 views

Legacy LongRange Mode information (mode 1 in the my attached link)

Mode 1- Legacy Long Range Packet Format and Im attaching a photo of ti reference: link for more information about this mode category : TI SWRA642 I want to understand the packet format, what's my ...
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1answer
49 views

Telling apart a right traveling non-periodic signal from a left-traveling non-periodic signal, with a background periodic signal

I have a time-signal sampled over a one-dimensional spatial domain $x$. I know it is made of 3 components: a right traveling non-periodic wave (characteristic time width $T_{R,NP}$, mostly 0 outside ...
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2answers
91 views

What is the best to confirm that the output of a matched filter for a linear FM chirp is correct?

I have written a matched filter in matlab to compress a linear FM chirp signal and would like to confirm that the results of my range compression. My question is what is the best way to do this? I ...
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1answer
47 views

How to check my CRC of my RF packet? [duplicate]

The "problem" is that I want to validate if my received RF packet is valid or not valid, in other words I want to validate if my RF packet corrupted or not corrupted . the transmitter that ...
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1answer
98 views

SVD vs matched filter

Reading about singular value decomposition (SVD) in the context of signal processing applications, one can separate the signal from the noise into orthogonal subspaces. On the surface this sounds like ...
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1answer
46 views

Why SRS signalling is used in 5g?

Since DMRS is also being used as a reference signal in PUCCH and PUSCH channel, so why an extra SRS signalling is required.
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1answer
49 views

LPF Filtering without changing DC value of signal

I have sampled my transmitted signal, it's looks like sinusoidal , frequency sampling is =2048Khz, bitrate of transmittion=100Kbaud , and my problem is that I have designed in matlab my LPF filter ...
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1answer
42 views

Matched filter for recieved RF digital packet by LPF

Im transmitting by cc1350 launchpad microprocessor digital RF Packets, transmitted modulation FSK. bit rate of transmitting is 50Kbouad, frequency of transmitting is 868MHZ . Im sampling the signal(...

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