Questions tagged [signal-detection]

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3
votes
4answers
12k views

Simple and efficient algorithm to detect frequency and phase of a sine signal

I need an algorithm to detect frequency and phase of a pure sine signal. The frequency of the input signal changes between 0 and 100 Hz. The value of the signal gets captured with a frequency of 20 ...
0
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1answer
40 views

How can I objectively measure train noise from a sound recording?

I have made an audio clip of some local train noise, and run it through a spectral analyser: https://youtu.be/ily4VEoEuSc Here's a screen-capture if you can't view that: As I watch the graph while ...
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0answers
41 views

Detecting complex signal within complex AWGN using Neyman Pearson statistic

I need to construct a Neyman Pearson statistic for detecting a complex signal with known amplitude and unknown phase in additive complex Gaussian noise. My hypotheses are: \begin{align} \mathcal{H}_0 &...
-1
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1answer
23 views

Calculating CRC of my packet [closed]

I'm trying to calculate the crc of my packet, how could I calculate my C of my received packet? packet is transmitted as this patern : preamable | syncword | data | crc attaching photo of my ...
2
votes
1answer
52 views

finding onset of an impulse signal, basics?

New to signal processing, but making good progress, I think. I have a series of (many) impulses I generated, which will be used as impulse responses to model our church's acoustics, in this time of ...
0
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1answer
131 views

CIC Filter implementation for Normalized Correlation

This is a follow-on to the original post ... I am trying to implement real-time correlation of two signals. I noticed the CIC Filter discussion here: How to find correlation/cross-correlation of two ...
0
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0answers
18 views

Threshold Estimation from a Linear FM Pulse Position Modulated signal

I have a signal chain to detect multi channel LFM (Linear Fm - Hann window being applied as shaping filter for the pulses) pulses as shown in picture below. (Numbers in the picture is in Hz., for ...
0
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1answer
30 views

packet encoder RF packets by using LPF for determining if it's zero or one [closed]

I'm transmitting RF packets with frequency 868MHZ , symbol rate (it's the same as bit rate) is 50KBaud , and Im sampling them by a dongle (fs=20480KHZ) to capture those RF packets, the captured ...
2
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3answers
142 views

Signals - question due to sampling

I don't have an idea how to start it. Help pls :) $$m = z(t) + \frac{\operatorname{Sa}(t-T)}{4}$$ We have some signal $z(t)=\left(\operatorname{Sa}(\frac{t}{T})\right)^2$. How often the m signal ...
0
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1answer
39 views

Deciding if the received packet is valid or not valid [closed]

I have sampled RF wireless packets as IQ samples file, those RF packets has patterns like preamable|syncword|data|crc , I'm doing cross correlation with my constant syncword (after I did the ...
-1
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1answer
49 views

Is pitch detection for bass instruments a solved theme?

I would like to know if pitch detection is a solved theme for an instrument like a bass (bass tones). Is it, or there is always a percentage of error rate on the detection?
0
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1answer
24 views

How to detect a signal while ignoring another signal which is a phase shifted version?

I have a signal coming from a sensor as shown below. This signal has high frequency noise (as can be seen from small fast wiggles) and four regions of interest where distinct spikes can be seen. The ...
0
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0answers
28 views

How to make noise power estimation on a single tone transmission?

Suppose we have a single tone transmission over a Single Input, Single Output (SISO) channel impaired by Inter-symbol Interference and Additive White Gaussian Noise (AWGN). How to compute the noise ...
0
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0answers
42 views

How to detect offset that changes along time in a signal?

I have an issue that has to do with detrending a signal. First, it seems my signals behaves a little unusual (for me, I think). Some signals starts with a quite large offset, then it seems to ...
0
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1answer
28 views

Advantages and disadvantages of multiplying sparse vector with sparse matrix

Assume I have a sparse vector $x$ whose few values are non-zeros, that vector is multiplied with sparse unitary matrix $Y$ giving $z = Yx$. Are there any advantages of detecting the sparse vector $x$ ...
0
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1answer
294 views

Correct comparison of FFT noise with FFT signal

I have a sensor which I am using to track a strong but noisy varying signal. When the signal is present there is a lot of energy in the FFT bins, when there is no signal the is much less energy - but ...
0
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1answer
34 views

Delays and alignment issues: how to compute the an equalizer delay?

For example, if an equalizer model experiences a delay due to its processing, the equalizer may misinterpret the boundaries between the equalized symbols it outputs and, therefore, return meaningless ...
2
votes
1answer
33 views

denoising floor function

Suppose that $y(t) = \lfloor x(t) + \epsilon(t) \rfloor$, where $\epsilon(t)$ is zero mean, independent noise. Is there any techniques on recovering $x(t)$ from $y(t)$?
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0answers
20 views
0
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1answer
78 views

DSP based FMCW radar

I have an SDR receiver I'm interested in making into a FMCW radar. The bandwidth is somewhat narrow as it only samples at 64 MSPS. There is a problem in that without a bunch of embedded programming ...
0
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0answers
39 views

How to perform signal detection in white noise?

We have a signal $s[n]$, given by the autoregressive model: $$s[n] = as[n−1] + u[n], n = 0, 1, ..., N − 1,$$ where $a$ is a real number and $u[n] \sim \mathcal N(0, 1)$ follows a normal ...
0
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1answer
259 views

Time delay estimation between two complex signals(IQ)

I need to time align two complex signals. The two signals obtained were at different RF frequency before digitisation. So,I have two complex signals(IQ) and I need to do delay estimation and apply ...
0
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2answers
60 views

Algorithm for detecting whether a signal stored in rolling buffer is Increasing, Decreasing or staying Constant

I have a data signal which is generated at constant time interval. It is a real world measurement and thus exhibits some noise in its value (it fluctuates approx + or - 20 units). The noise is fairly ...
0
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3answers
83 views

Is there a way to protect your signal?

I'm looking for a way to shield or protect produced signal or wave. In mechanics suppose you run the wave in tunnel. Is there a way to do it in transmitting the signals or waves created by mobile ...
0
votes
1answer
479 views

How to convert the mean and variance of a processed received signal into a SNR or BER?

So I'm trying to eventually get some sort of signal quality metric, and to do that, I'm trying to take the mean and variance of my bit determination signal and use that to come up with a Signal to ...
0
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1answer
39 views

How can I create a jamming signal for desired frequency?

I am working on GPS interferences and countermeasures. I came across jamming in GPS receivers. So I have a input signal with frequency of 1200 MHz How can I create a jamming signal that can mask ...
0
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4answers
52 views

Signal analysis: selection of oscillatory parts

I'm trying to analyze the following signal: My aim is to select the high-amlitude oscillation parts limited by the red stars. At the beginning, i have tried to set a threshold and keep only the ...
0
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1answer
478 views

Why the energy is a good feature extraction for detect disturbances in signal processing?

To detect disturbances in signal processing a common step is to extract signal characteristics to analyze them, among these characteristics it is recommended to use the signal energy. Why energy is ...
0
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2answers
307 views

Long term spectral flatness measure voice activity detection

This is the Long term spectral flatness measure code that I have written so far. Can someone please help me, I don't know if I'm writing it correctly. It is working fine and gives high peak for ...
0
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3answers
38 views

m-ary antipodal signaling

I know that the error probability for binary antipodal signaling is $Q(\sqrt{2E_b/N_0})$ with $Q$ the tail function. I was wondering if when used in a m-ary scheme how the probability error would ...
0
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0answers
10 views

Noise Temperature for AsiaSat 5

So I am working on AsiaSat 5 G/T. How to calculate Noise Temperature for Antenna I derived Gain at receiver antenna. Now I need to calculate for Noise Temperature to get G/T. how can I calculate ...
0
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1answer
245 views

Pitch detection algorithms “give up” after very little

I'm sorry if pitch detection has become a stale topic here, but I'm really interested if anyone has any advice on this topic. I'm looking for the best pitch detection algorithm for stringed ...
1
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2answers
2k views

Exact definition of soft bits in digital receiver

At which stage of digital receiver, the bits are considered as soft bits? I am unable to find the exact definition. I have rough idea how soft bits are different from hard bits but in terms of signal ...
0
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3answers
787 views

Expectation of deterministic signals

Maybe this a stupid question, but I came along with this point and I would like to confirm that I am not wrong. I found some similar posts in StackExchange, like: Expectation and Auto-correlation of ...
0
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1answer
133 views

Performance evaluation in terms of channel MSE and BER

The first figure on the left (in this paper) provides the channel NMSE performance and the the second figure from left provides detector's BER performance. I am curious, when the channel MSE ...
1
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2answers
57 views

Typical shape detection algorithms

Here is my target, given a set of consecutive discrete 1-d data points within a window. I want to know whether there are good algorithms to detect certain typical shapes of the signal in the window. ...
1
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1answer
28 views

Identify if a Specific Edge Pixel Belongs to Horizontal, Vertical or Diagonal Edge Line

I have a code below that identifies the edge of the text image. Input image is: Output display is: I want to select random points near the edge border of the text. I was thinking to identify if the ...
5
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2answers
881 views

How to calculate the phase shift AND time delay of non-periodic signals

Say I have two non-periodic signals, $f_1(t)$ and $f_2(t)$, with Fourier transforms $F_1(\omega)$ and $F_2(\omega)$. Basically, I need to line up $f_1(t)$ and $f_2(t)$ as close as possible, and I am ...
1
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0answers
57 views

GPS Acquisition Graphs [closed]

I am trying to generate GPS Acquisition signals using frequency code phase search acquisition. I generated C/A gold codes and digitised at 16.368e6 MHz(sampling frequency) I generated carrier signals ...
0
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1answer
36 views

What is full scale?

I read the Wikipedia documentation and it's not clear to me what is the full scale concept. What is the meaning of changing the full scale? How I can preserve data in that scale?
1
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1answer
136 views

Detecting expected patterns in repeated measurements

I am new to signal processing and I am trying to learn myself. To understand what i am interested in, let me show this on example (note that this is just a random example to illustrate). Here is some ...
2
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1answer
46 views

BER performance of fractional equalizers for colored noise

I am trying to compare the BER performance of fractional and symbol spaced equalizers for channel equalization in colored noise scenario. I have found from simulation that for positively correlated ...
0
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1answer
19 views

Please clarify the mandatory condition on Vestigial Sideband Modulation filter?

In VSB filter we have the Transfer function condition as $H(F-F_c)+H(F+F_c)=1$ So can we accept that for the range of $F$ in $(F-df,F_c)$ we have $H(F)$ and for $(F_c,F+dF)$ we have $A-H(-F)$ where $...
0
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2answers
46 views

Coherent detection in radar and radio signals

Coherent demodulation\detection is usually done via matched filtering in RF signal processing. In radar signals, coherent integration can be done if the phases of the returns are known. In terms of ...
0
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1answer
105 views

Does flat surface detection and orientation require special hardware to compute?

Modern augmented reality platforms such as Google's ARCore and Apple's ARKit seem to only operate on mobile devices, I'm guessing, because their underlying algorithms require specialized hardware that ...
0
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1answer
50 views

Loop Bandwidth for Carrier Demodulation loop

I am trying to implement a simple MATLAB model for the demodulators for phase modulated signals (PSK) used in communication systems. For the detection of the phase modulated output (PM out in the ...
1
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1answer
378 views

Low frequency and high frequency noise of ecg

Is baseline wander in ecg is low frequecny noise in ecg and power line interference is high frequency noise in ecg? Is both the artifacts present in EMG signal?
1
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3answers
137 views

Understanding the Difference Between MAP Estimation and ML Estimation

There are a number of possible criteria to use in making decisions. Can someone elaborate on the difference between ML and MAP for a sequence of BPSK symbols impaired by Gaussian noise ?
1
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1answer
593 views

How to Find Shift Between Two Signals with Cross Correlation?

I have calculated the cross-correlation function between to waveforms. I would like to find the shift between the two waveforms from the peak of the cross-correlation function. I am not really sure ...
0
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5answers
115 views

How Can Telecommunication System Know Which Part Is Signal and Which Is Noise? [closed]

When signal is received how can receiver know which part of received signal is signal and which part is noise??

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