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12 views

Designing a PI filter for a Costas Loop

I am currently trying to implement a Costas Loop in order to demodulate a BPSK signal. Here is the reference block diagram I have been using to design the loop:Costas Loop Block Diagram I originally ...
0
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0answers
11 views

Time Frequency bin

I am doing research in audio signal processing for DOA estimation. I came across the term Time-Frequency bin. I have gone through several articles but none of them specify a TF bin rather it specifies ...
0
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0answers
7 views

Identifying the boundary points of a shape based on the centroid

I have a set of binary 2D images with objects in white and their boundaries in black (attached example). I also have a list of centroids (x,y coordinate pairs) identifying all objects. For each ...
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0answers
6 views

How do I create a polar plot from a multi-channel sound file?

I have a multi-channel sound file from a microphone array. I want to get the polar plot in Matlab in order to get the directivity patter of the sound source. How do I do this? I did the FFT on the ...
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0answers
11 views

bandpass waveform detector?

I am hoping that somebody might have a good idea for detecting low-frequency pulses in some rather noisy data (I'm working on improving the snr). I have repurposed a "Raspberry Shake 1D" to record the ...
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0answers
8 views

USRP N210 and FFT

I am getting IQ data from my usrp N210. It has been written in a file as a complex number and I can analyze it with matlab. The IQ data actually resembles the power of my processor. The sampling ...
0
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1answer
33 views

Maintain constant total amplitude of sum of sines

Given a set of N sine waves, each with their own amplitude and frequency, is there a straightforward way to select their phases such that the sum over all sines maintains a constant amplitude, given ...
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0answers
6 views

What is the QPSK Constellation Diagram used in LTE

I think the question is pretty straightforward. I have to do a class project that requires me to modulate a signal, and one of the steps is Quadrature Phase Shift Keying (QPSK). It is to be done in ...
0
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1answer
15 views

why if I place the zero of the lead compensator at lower frequencies I have a resonance peak?

I am studying control systems, and I am studying the lead and lag compensator. I have seen than if I use a lead compensatpr in the following way: consider a closed loop transfer function: $T(s)=\...
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0answers
14 views

Digital beamforming and phase shift insertion

I have read some literatures about the different topologies of beamforming and it came to my mind a question. In analog beamforming, the modulated carrier signals is splitted to the different ...
0
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1answer
19 views

Relation between impulse response and Region of convergence?

Is there any relation between impulse response and Region of convergence?Means position/location of ROC depends upon impulse response or not?? Please kindly guide about cases for both continuous and ...
0
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1answer
29 views

How to make low pass filter using frequency sampling method?

https://www.allaboutcircuits.com/technical-articles/design-of-fir-filters-using-frequency-sampling-method/ So there is two main equation: I wish to filter out frequency <= 1000Hz, for example. So ...
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0answers
17 views

the computer can implement a filter with only 8 coeficients. Sample the spectrum accordingly [closed]

The sampling frequency is 100kHz and we want to make a low pass filter with a cutoff frequency of 19kHz. We start from the diagram Figure 1. The computer can implement a filter with only 8 ...
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0answers
21 views

Why my result from FFT which is negative frequencies are different from positive frequencies

I am trying to analyze a signal from monkey brain by applying FFT on the signal. By using numpy.fft.fft function to perform Fourier Transform on raw signal, I got the power of frequencies in the ...
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0answers
18 views

Frequency contour detection in spectrogram

I have an image of a spectrogram and I wish to detect the tracks/contours of prominent frequencies present in the spectrogram. In the end, I want to be able to get various prominent curves from the ...
0
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1answer
19 views

Is it possible to observe more area in azimuth than physically traveled in stripmap SAR?

I have been examining stripmap SAR algorithms, mainly Range Migration Algorithm. When I check the textbook examples so far I always saw the data trajectory is larger than scene that is observed. An ...
1
vote
1answer
18 views

Channel impulse response in freqency domain

I have a doubt about DFT matrix and channel impulse response. Let $h$ is a channel impulse response , $F$ is a DFT matrix. IF I take a product. I got: $$ F* h=\tilde{h}$$ $\tilde{h}$ is a frequency ...
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1answer
39 views
1
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0answers
27 views

Is MMSE equalizer necessary?

For observation $y$, channel coefficient $h$ and gaussian noise $w \sim \mathcal{CN}(0,\sigma^2)$, $$y = hx + w \tag{1}$$ Note that for OFDM system, (1) is assumed channel input-ouput equation on ...
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0answers
16 views

Vibration analysis: harmonics' amplitude

I am studying the vibrations on a FZG gear test rig with two accelerometers on the casing of the gears. These accelerometers sample at a rate of 10kHz. When looking at the main amplitude peaks on the ...
0
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1answer
39 views

From Orthogonality to DTFT

I have met this question, but cannot prove it using DTFT definition. Given: $g$ is a discrete sequence filter and: $$ g \in l^2(Z)$$ $$\langle g_n, g_{n-2k} \rangle = \delta_{k}$$ Prove: $$|G(e^{j \...
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0answers
26 views

Can someone give me a derivation for the formula relating the detection probability, false alarm probability and SNIR?

I have found the following function relating the detection probability $P_{D}$, the false alarm probability $P_{FA}$ and the $SNIR$. Can someone explain to me why this formula is valid or give me a ...
0
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0answers
17 views

Spectrograms in Short-time Fourier Transform

I was watching this video, https://www.youtube.com/watch?v=NA0TwPsECUQ and the information that was displayed at 4:30 didn't make sense to me. The original time domain signal was recorded at 44100 ...
0
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1answer
40 views

Help find the bug in my SPLL code

In an attempt to get myself up to speed with PLLs I'm trying to implement Example 1 from this tutorial, in Python: https://wirelesspi.com/phase-locked-loop-pll-in-a-software-defined-radio-sdr/ (search ...
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0answers
18 views

Video Call Processing (Whatsapp, Skype) [closed]

Is it possible to process an image in a video call on Whatsapp?
-1
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0answers
31 views

Conditioning a Random Variable [closed]

The pair of random variables $(𝑋,𝑌)$ is equally likely to take any of the four pairs of values $(0,1), (1,0), (−1,0), (0,−1)$. Note that $𝑋$ and $𝑌$ each have zero mean. a) Find $𝐄[𝑋𝑌]$. b) ...
-2
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0answers
17 views

How can I Traverse in a graph to find the shortest path between source and destination using “Dijkstra's Algorithm” in python? [closed]

how should I travel from source to destination using only the white paths.(source and destination are blue in colour, red ones are the nodes through which path should be made). This is a bitMap image. ...
1
vote
1answer
137 views

convolution vs correlation? [duplicate]

What is difference between convolution and correlation?In simple words or in a nut shell? As far as i am able to study is that Convolution is a mathematical operation used to express the relation ...
0
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0answers
31 views

CNN feature classifier with spectrograms [closed]

I am very much new in the field: I am trying to build a Convolutional Neural Network (CNN) for my signal data. My dataset looks like this: ...
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0answers
20 views

what is spectral efficiency? [closed]

If the energy per bit is 12 dB and the noise level is 8 dB, what is the spectral efficiency? If the channel bandwidth increases, what will happen to the spectral efficiency and Eb/N0.?
0
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1answer
48 views

How to do the Fourier Transform of bounded function?

I was trying to solve a Fourier transform of a function using the properties of Fourier transforms. The function is given as: $\frac{At}{2}$ for $-2<t<2$ and $0$ for all other $t$. Doing the ...
2
votes
1answer
77 views

Puzzled by CIC filters

I have been trying to wrap my head around CIC filters. Say that I want to do filtered decimation by a factor D. Option#1: boxcar filter. Each output sample is formed by taking the sum of D input ...
0
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1answer
29 views

processing gain in the receiver

I am always confused about the processing gain in the receiver. assume my receiver had LNA-> mixer->filter->ADC. does the filter in the analog section has any role to play with the processing gain? ...
0
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0answers
35 views

MIMO multipath delay

How is multi-path delay dealt with in MIMO systems? Most of the theory I have read on MIMO doesn't address multipath delay and assumes the multipath interference is limited to secondary antenna ...
0
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0answers
13 views

Rayleigh multipath fading channel in Matlab

I have to calculate eigen values of covariance matrix of Rayleigh multipath fading channel. The exact value should depends on delay spread and subcarrier spacing. I am able to find eigen values but ...
2
votes
3answers
79 views

realtime software 90 degree phase shift a sinusoidal signal

I would post this to stack overflow but it seems to me more like a signals and systems problem, which EE's thrive on. I need a realtime system implemented in software that can generate a sinusoid ...
1
vote
1answer
36 views

Getting hilbert transform of IQ signal

Im new to communications so this may be a stupid question, but I am somewhat confused. I am trying to train an automatic modulation classification (AMC) algorithm on IQ data from the RadioML dataset. ...
1
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0answers
34 views

How to spatially transform differently magnified images for spectral analysis?

I'm working with an imaging spectrometer that takes images with different filters that cause each image to have a different magnification, while the image size stays constant. I want to do spectral ...
0
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1answer
22 views

What does it mean for a dynamical system to be well-behaved?

I have recently stumbled across a paper about learning arbitrary dynamical systems in a spiking neural network. The paper assumes an underlying dynamical system of the form $\dot{x}=f(x)+c(t)$ where $...
1
vote
1answer
26 views

Advantage of applying a Window Function in Analysis and Synthesis of STFT?

I'm studying Short-time Fourier Transform and I learned that if you apply a windowing other than rectangular, you need to overlap the frames---for example, 50% overlap for Hamming family---to ...
0
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0answers
22 views

Flicker Frequency for taking snapshot of monitor [closed]

When a snapshot of a monitor with refresh rate 60 Hz is taken with a camera with rolling shutter config operating at 30 FPS, what is the expected flicker frequency in the resultant image? I took ...
2
votes
3answers
114 views

Estimating the Signal by Deconvolution with a Prior on the Filter Coefficients

Assume I have signal $y[n]$ which is a result of convolution between channel $h[n]$ and signal $x[n]$. which means: $$y[n] = h[n] \ast x[n]$$ where $\ast$ is the convolution operation The signal $...
0
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0answers
25 views

IQ to RF data conversion [closed]

I appreciate any help: I wanna convert IQ data to its RF data, representing an image. The center frequency and sampling rate are available. What I do is: First I do up-sampling in MATLAB by ...
0
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0answers
10 views

Path delay influence in BER performance using Rayleigh channel

I am simulating a DSSS modulation in a Rayleigh channel to get the BER performance. For these purpose I am using the comm.RayleighChannel object. My problem comes when I change the Paths delays of the ...
2
votes
1answer
38 views

Frequency prewarping of a bilinear transform (Tustin transform)

sadly I'm not too well aquinted with discretazation methods. At the moment I struggle to reproduce a bilinear transform with frequency prewarping. I have the following transfer function in the s-...
0
votes
2answers
40 views

Whether y(t) = x(t/3) is a memoryless system?

I am a newbie in signal and system, and feeling confused about the memoryless property, it says at the definition, if a system gives output only depends on present input, then its memoryless. So if at ...
0
votes
1answer
31 views

how to understand the MIMO zero forcing as a bank of decorrelators?

I am studying the zero forcing as a simple linear receiver for MIMO detection. according to following notes: http://www.ee.ic.ac.uk/bruno.clerckx/All.pdf. The zero forcing can be understood as the ...
0
votes
2answers
35 views

How to re-program/modify sound frequencies without DSP processor?

I'm developing a mobile application that controls Bluetooth sound-speaker functions, which includes an equalizer to modify the output audio frequencies. The audio processing module on the speaker ...
0
votes
0answers
10 views

EEG signal dataset info

So I wanted to use pre processing on EEG data obtained from BCI competition 2005 dataset iiia which is a multiclass dataset. This data has lots of info on it but i cant seem to obtain/get data other ...
0
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0answers
10 views

Use sparse optical tracking to track a Bounding Box object

I need some help on solving this issue. Any tips are appreciated. The goal of the project is to try to track a Bounding Box object, chosen arbitrarily in an image, throughout many frames of a ...

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