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29,012 questions
6 votes
1 answer
159 views
Window length clarification - FIR Filter
I'm reading an IEC standard and they say "Group delay of a finite Impulse Response (FIR) filter based algorithm with symmetric or antisymmetric coefficients is equal to one-half of the window ...
0 votes
0 answers
23 views
ber(eb/no)- how to get 1.75dB gap between rate=1/2 and rate=1/3? [closed]
I'm looking to do - BER(Eb/no)- for convoultional codes how to find the gap =1.76db between rate=0.5 and rate=1/3? i dont manage to do so. i dont know how to copy the graphs, but these very old graphs ...
1 vote
0 answers
22 views
Accurate Function for calculating PSD-chatter index?
I was working on my research and I was adapting the Power Spectral Density Chatter Index from paper "In-Process Chatter Detection Using Signal Analysis in Frequency and Time-Frequency Domain"...
1 vote
0 answers
35 views
Contraction of magnitude spectrum with increase in sampling frequency
I was implementing the cascade algorithm to obtain the D4 scaling and wavelet functions in MATLAB iteratively. The code can generate the functions properly, but the magnitude spectra I obtain depend ...
0 votes
1 answer
58 views
Correct unit for transfer function
I am trying to calculate the transfer function between one sensor with velocity timeseries data $y(t)$ and a witness sensor $x(t)$ which monitors position. Both sensors output data in volts, with a ...
0 votes
1 answer
15 views
The flow of frames in a full synchronization chain in digital receivers
I have a full synchronization chain in a digital receiver that consists of: Coarse frequency synchronization: this is a blind balanced quadricorrelator Frame synchronization: this is data-aided ...
0 votes
1 answer
28 views
Why does Python skimage.transform.resize give different results from MATLAB imresize for the same array?
I'm trying to replicate MATLAB's imresize behavior in Python using skimage.transform.resize. Here's my test case: Python ...
0 votes
0 answers
16 views
<GNURadio,SDR> Newbie to SDR. Plz help me
I am currently using the USRP b200 mini to copy what is shown on the site below. https://kb.ettus.com/Transmitting_DVB-S2_with_GNU_Radio_and_an_USRP_B210 However, I found an issue where the usrp_sink ...
0 votes
0 answers
73 views
Computing inverse Fourier Transform for an even real signal
Given a real, continuous signal $x(t)$, which has a Fourier Transform $X(\omega)$ satisfying the property; $$\ln\vert X(\omega)\vert = -\vert \omega \vert.$$ Find the signal $x(t)$, if we assume it to ...
0 votes
0 answers
10 views
OFDM invalid packets, filtering problems in GNU Radio
I've been working on a custom OFDM implementation and I'm getting a lot of ...
0 votes
1 answer
24 views
OFDM timing algorithm in FPGA
What algorithm is typically used for OFDM (4G/5G) timing recovery in FPGA implementation?
0 votes
1 answer
36 views
Could anybody kindly help with this DVB-T problem?
In the DVB-T constellation chart, there are occasional, irregular, sporadic flickering points in the blank spaces between adjacent points. The flickering points flicker within a fixed range, with an ...
0 votes
0 answers
43 views
Looking for some Time Dependant Fast Fourier Transform, FFT, tutorials
I am converting some image data to audio by altering the FFT frequency array, of a sound sample, using a 2D section, yellow square in video, as the manipulation data. At the moment its in discreet ...
0 votes
1 answer
43 views
Two dimensional visualization of the Fourier shift theorem
I wanted to examine the simplest possible situation of the Fourier shift theorem. My interpretation of the theorem is this: Displacements in image space lead to phase changes in Fourier space. To that ...
0 votes
2 answers
64 views
How to start building a piano note detection program (simple right-hand recordings, step-by-step approach)?
I’m currently working on my undergraduate thesis, which is related to digital signal processing. The goal of my project is to create a program that can “listen” to piano recordings and convert what it ...