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14 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? ...
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0answers
11 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 ...
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0answers
8 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 ...
1
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1answer
27 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
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1answer
24 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. ...
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0answers
23 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 ...
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1answer
19 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 $...
0
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1answer
14 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 ...
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0answers
20 views

Flicker Frequency for taking snapshot of monitor

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 ...
1
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1answer
59 views

Estimating the Signal by Deconvolutiona 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 $...
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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 ...
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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
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1answer
34 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-...
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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
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1answer
25 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 ...
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2answers
33 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 ...
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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 ...
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0answers
9 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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0answers
12 views

How to prepare different input size in CNN

I'm doing a research about personality identification based on their signature using CNN method, however the learning feature for the personality traits have a different input size. I understand that ...
-1
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0answers
19 views

How to extract speech features using deep learning?

I found deep learning for classification, but I want to extract features from speech signal using deep learning in python.Is it possible, if yes then how?
1
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1answer
31 views

How to derive low pass filter $\frac{N}{N+S}$

I watched the video for PID control system where it mentioned the Laplace domain function and low pass filter to be $\frac{N}{N+S}$. I used asymptotic analysis to see that it made sense. However, I'm ...
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0answers
22 views

Synthesis of 75% Window Overlap Add method for Short-Time Fourier Transform (STFT)

I'm doing the overlap-add method for STFT and I quite understand the implementation if it's a 50% overlap (where I add the 2nd half of the previous frame to the 1st half of the current frame during ...
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0answers
15 views

removing noise using Scipy.signal.butter:

I am going to remove the noise from a brain recorded signal. It was a continuous recording and with sample rate=30kHz, it was digitized. So now it is a digital signal. I have written the code here ...
1
vote
1answer
67 views

How to approximate a moving RMS without iterating over N samples for each required output?

I have a signal with a sampling rate of F Hertz. From it I want to produce an RMS signal, also with F samples per second with a window size of N samples. Using a standard moving RMS algorithm I must ...
2
votes
1answer
36 views

Is HSV Color Space Sufficient for Rudimentary Color ID and Edge Detection

I want to, as part of a C++ school project (no OpenCV), work with an RGB image taken from a camera filming smarties (round colored pellets) from above and extract the number of candies in each color. ...
0
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1answer
40 views

Reducing one frequency in song

How would I take a song input and output the same song without certain frequency ranges? Based on my research so far, the song should be broken down into chucks, FFT it, reduce the target frequency ...
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0answers
11 views

how can I calculate tine gap in different waves

I want, calculate the time gap between two signals .but that signal has frequently changed the frequency range. I want to combine with these two signal including phase shift I have a circuit for ...
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0answers
11 views

Comparing two meshes obtained using Structure from motion

I'm trying to find some literature about the following problem, but I'm not entirely sure what to look up. Suppose you have an object that you manage to re-construct using structure from motion at ...
1
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0answers
20 views

Interference between two signals with the same frequency. (exercise from the book software receiver design)

I find it hard to describe the LPF. This is an exercise from the book Software Receiver Design Build Your Own Digital Communications System in Five Easy Steps chapter 4.23.
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0answers
12 views

How accurate is a MPU9250 IMU for direction and velocity measurement?

Pardon the intrusion I've posted this on the Raspberry Pi stack, but I wonder if I might find an answer here more quickly. I'm currently experimenting with a MPU9250 Inertial Measurement Unit (...
2
votes
1answer
39 views

Why are 8 points needed to compute a fundamental matrix?

Homograpies have 8 degrees of freedom. Fundamental matrices have 7. Essential matrices have 5. To the best I could find, all those matrices are obtained by using the 8 point algorithm. I don't see ...
2
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0answers
20 views

Array bounds check o(1) (Integral image?)

Not sure if this is the correct place to ask but I have a question about techniques for processing an array of pixels with o(1) complexity. That is to get the sum of a subset of an array but if this ...
0
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0answers
34 views

Sum of correlated exponential random variables

How do we find PDF of sum of correlated exponential random variables. I know for independent random variables. But how to find it for correlated exponential random variables.
2
votes
1answer
50 views

What exactly is transmit power in wireless communication?

My background is computer science. Recently, I had to come across some concepts in wireless communication/cellular mobile communication. Despite having gone through many materials, I am still having a ...
0
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1answer
31 views

Hand written DFT vs MATLAB FFT has flipped conjugates?

I had to compute the DFT of a signal with 5 points with a hand-written method and using MATLAB's FFT just to see if they are equal. Taking the absolute value of both gives the same spectrum, however ...
0
votes
1answer
38 views

Using I/Q demodulation/LIA for a fixed-frequency application of several signals - do the phases of the input signals affect the result?

My input is a single signal composed of the sum of four periodic signals, each 4 Hz apart, centered around some resonant f0 typically between 1200 - 1300 Hz; the actual frequencies will change ...
0
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1answer
16 views

Measurement delay versus control delay

For a typical control loop (no delay, measurement transfer function is 1) the closed-loop transfer function is $$ H(s) = \frac{G_{comp}G_{process}}{1+G_{comp}G_{process}} $$ With an actuator delay ...
1
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1answer
26 views

phase response of an analog filter

I am trying to understand the relation between phase response of an analog filter and its influence on the quality of a signal with PSK modulation. For example I want to design a BPF for HF ...
0
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1answer
18 views

Math.Net and alglib returning different FFT outputs by default

I am developing an application in C# with spectrogram drawing functionality. For my fist try, I used MathNet.Numerics, and now I am continuing to develop with alglib. When I changed from one to the ...
0
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0answers
19 views

QPSK matlab/simulink Quantisation effects

I am trying to simulate the effects of quantization of an ADC on different waveforms (e.g. QPSK,8PSK) in Simulink. For the case of QPSK the default BER curve would be generated with 2 bits per symbol ...
0
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2answers
48 views

Window functions and the Fourier transform

I want to clarify the 'correct' way to use windowing and Fourier transforms. My question is somewhat related to this one, but I have a few additional queries. I have some real, non periodic signal ...
0
votes
1answer
24 views

How to add a particular noise on a signal?

I have a simple ADC model (an input signal == sampled signal ). The adc should be modelled as with following values: 1.5 V (peak to peak).. meaning --> +1.5 V --> 0 dBFS ... how to do this ? The ...
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0answers
24 views

Decomposition of a non-stationary signal

Suppose $f(t)$ is a non-stationary signal which can be expressed as follow: $f(t) = A_1(t)\text{sin}(\omega_1t) + A_2\text{sin}(\omega_2t) + ... + A_n(t)\text{sin}(\omega_nt)$, where $0 \leq t \leq ...
0
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0answers
10 views

Non-linear system identification with random lag errors

I've been researching this topic for a little while and I haven't found anything particularly concrete. I'd very interested to know if there is an accepted solution for this problem, and whether there ...
0
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0answers
16 views

Convergence of LMS

I'm not really sure about the following question and don't know where exactly to look it up, so I'm asking here: I have an adaptive filter and compute the coefficients iteratively using e.g. LMS or a ...
0
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0answers
14 views

Basic in frequency-selective channel: part with decoding

Here I have asked about the basic of the theory of frequency selective channel and the user @Florian explained to me how to compute precoding in such case using the effective channel. I am just ...
1
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1answer
63 views

Confusions regarding convolution?

As far as i have studied and understood, convolution is the process by which we can get/determine output of LTI systems While reading one web link about convolution, i came across certain notation ,...
0
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0answers
24 views

Fast Document Enhancement

I followed Dropbox's blog - Fast Document Rectification and Enhancement To enhancement image, I need solve this formula J(x,y) = gain(x,y) * I(x,y) + offset(x,y) Where J is image after ...
0
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0answers
25 views

interpolation control in timing recovery

I was able to implement qpsk on my board. I could check data transfer between two seperate boards and it working fine. but what i observed was sometimes when mu goes to maximum it starts toggling ...
0
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0answers
15 views

Channel coding simulation

I’m new to channel coding, and I’m trying to learn about channel coding in general, and iterative turbo coding in particular. I was trying to play with some simulink examples while reading to get a ...

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