Questions tagged [pulse]
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53 questions
2 votes
0 answers
150 views
Using weighted fill pulses in pulse radar
In the context of pulse radars, I'm wondering exactly why and how so-called "fill pulses" are used. I understand having $N$ fill pulses allow operators to retrieve $N$ echoes within the ...
- 222
0 votes
1 answer
75 views
Pure sine wave function with tunnable valley peak ratio
I couldn't find any on internet for sine-wave similar like PWM in square wave. Where I can tune the sine-wave valley-peak ratio. Where 100% ratio means 100% peak (or 0% valley), the graphic will ...
0 votes
1 answer
36 views
Understanding Unexpected Spectrum
I have a piezo element with a resonance frequency of 90 kHz. When stimulated it has a time constant of 100 µs. From this model (exp * cos) together with modelled white and pink noise I would expect a ...
- 105
2 votes
4 answers
1k views
For the square wave signal, why does a narrower square wave correspond to more spread in the frequency domain?
Consider the square wave. As we decrease the pulse width $T_1$, it seems that the positive Fourier coefficients (located in the central area/lobe) are spreaded out across more frequencies. In fact, if ...
- 643
0 votes
1 answer
105 views
What happens to the frequency response as a single sample Kronecker delta impulse widens into a square pulse, and then into two distinct steps?
1) Kronecker I was instructed here that a single sample Kronecker delta unit impulse function (goes from 0 to $A$ to 0 again in single sample) has a white noise type frequency response - all ...
- 553
2 votes
1 answer
239 views
Is BPSK relevant, or does it even exist, in wireless data transmission?
I ask this question because it seems to me that if pulse shaping has been applied in the transmitter, the signal that is actually transmitted is not phase modulated at all, rather, it is amplitude ...
- 133
1 vote
0 answers
272 views
Exactly when is pulse shaping applied in the radio transmitter, before or after modulation, and is it applied differently in BPSK, QPSK and 16QAM? [duplicate]
I previously asked at which stage pulse shaping is applied in a WiFI transmitter and my question was closed due to duplication. The answers I was directed to have only served to confuse the issue for ...
- 133
3 votes
1 answer
149 views
Onset time determination of fast pulse
I am looking for the most precise way to determine the onset time of a very fast pulse sampled at 5 GHz coming from a physics detector. Here is an example of my signals: I already tried different ...
- 51
3 votes
2 answers
182 views
How to create a filter that is a single period of a time-warped raised cosine?
I am attempting to implement a filter described in the paper Functional Count-Comparison Model for Binaural Decoding by Pulkki et al 2009: Here is Figure 9: However, I am quite certain that the ...
- 41
2 votes
1 answer
79 views
Signal reconstruction given non-impulse sampling
With sampling modeled as a multiplication with a dirac comb, we can recover the original signal perfectly with a low pass filter given that the sample-rate criterion is satisfied. What about a more ...
1 vote
0 answers
90 views
How to analyse signal where one sample (timestamp) captures multiple data points
I have a process that captures interactions between a source and a sink. Unfortunately, the timestamp on the sample is one day. This means that regardless of the number of interactions (flows of ...
- 133
1 vote
0 answers
154 views
Why is Envelope noisy even after filtering and achievement of SNR gain (-6dB SNR to 14dB snr)?
A noisy signal with 500 MHz bandwidth, with negative SNR, when filtered to 6 MHz bandwidth, should attain a theoretical SNR gain of 20 dB. So if the original signal has -6 dB SNR, after filtering we ...
- 11
1 vote
1 answer
544 views
Why a is pulse in units of 1/Hz/sec
I don't understand the unit of the pulse shown below. Hz by definition is 1/sec. If it's in time domain then BW is in seconds. If it's in frequency domain its Hz. What is the logical meaning of the ...
- 171
2 votes
1 answer
187 views
Window Choice of FFT
I am working with data from a TeraFlash THz Spectrometer from Toptica, which gives me the pulse in the time domain and the spectrum in the frequency domain I have been experimenting with the FFT to ...
- 23
0 votes
0 answers
88 views
In radar pulse analysis, why is the PRF of pulse not calculated using Fourier transform?
So, I am fairly new to this, but when going through books on Radar pulses, I noticed that quite often, a formula describing the frequency of the waveform is given. For example, the frequency of a ...
