Signal Processing Stack Exchange
Signal Processing Stack Exchange

Questions tagged [pulse]

35 questions
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Fourier Transform of Alternating Periodic Rectangular Pulse

I'm having trouble determining Fourier transform of signal. I have 2 ideas on how to solve this problem. Given the signal is periodic I could use formula for Fourier transform of periodic signals: $$X(j\omega) = \sum\limits_{k=-\infty}^{\infty} C_k…
Aleksandar Simonović
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1 answer

Radar Pulse Compression Gain (PCR)

Assume a monostatic radar is transmitting a pulsed waveform. The pulse has been modulated by a Barker code with$\ N$ chips or bits. The waveform chip rate is $\tau_c $, the radar receiver's detection bandwidth is $\beta_c = 1/\tau_c$, and the…
random_dsp_guy
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3
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Use of pulse shaping in digital modulation

Sorry, I am a little bit confused here cause I thought when we say QPSK, the signal looks like the following. I thought the bits to send/receive depends on the phase shift of the carrier, or is the above picture wrong or will never happen in real…
уве вонг
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Difference between Fourier-Transform and FFT of rectangular pulse

I'm trying to find a link between the Fourier-Transformation of aperiodic Signals and the FFT of them. So to start with a basic example, let's take a rectangular pulse with width 0.1s and amplitude of 1 shifted by 0.05. Using correspondency, i can…
elperrorocho
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2 answers

What is the autocorrelation of a Dirac pulse?

What is the autocorrelation of $x(t) = \delta(t)$? Can you explain to me how to calculate it?
Kinka-Byo
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4 answers

Estimate peak width from a vector that is a superposition of unknown number of identical Gaussian peaks with different heights?

If you have a vector that is a superposition of an unknown number of identical Gaussian shaped peaks/impulses of unknown width (but all the same width) and different amplitudes (with Poisson or Gaussian noise), would anyone know of a method to infer…
Tom Wenseleers
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Requirements on Signal Spectrum for Fractionally Spaced Equalization

I'm constructing an ultrasonic communication system and I am struggling with the correct parameters for my receiver. In baseband, my channel input signal $x(t)$ has infinite bandwidth, since I use a rectangular pulse shape (which I have to because…
PeterO
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How does one go about choosing a Radar Cross Section for a human when modelling a Pulse micro-Doppler microwave radar?

So as part of a personal project I'm in the process of simulating and making a fall detector using a 2.7GHz microwave sensor with a range of 8m. I've been using MATLAB's example code to simulate each part of the radar as well as a target and a…
Mighty Funkster
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Relation between Gaussian derivatives and Gausian-windowed Cosine function

I am doing some research on UWB radars which transmit a pulse given by: $$ g(t) = p(t) cos(2\pi f_{c}t) = A e^{(-\frac{t^{2}}{2\tau ^{2}})} cos(2\pi f_{c}t) $$ In some other papers, the transmitted pulse is also described as a higher order…
Charis Hadjipanayi
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Minimizing Time Sidelobes with Pulse Compression

I am trying to compute a compression filter function to minimize the error from a a desired pulse compression result. The usual approach to doing this is to minimize the RMS error of the the compressed signal while it's represented in linear terms…
Jim
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Why is Line coding called "Line coding"?

Guys do you now why line coding also called digital base band modulation named "line coding" where does it come? and how is the name related to modulation
yohans hailu
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FFT on Pulse Trains with Varying Periodicity

I am looking at FFT on events over the course of a year (~365 days). My data is the number of events in a day. I assign occurrence as a pulse with the amplitude reflecting the number of events. I see this as a pulse train because the events are…
MikeB2019x
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Using lock-in amp to measure pulsed signal

I am working on a design of an acoustic resonator for sensing application, I use an excitation field at a certain frequency (a), and measure the response of the sensor (b), for my application, I only care about the ringdown part to tune the…
ee_neuro
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Why symbols have to be upsampling, if the symbol rate and sample rate is same what happen?

In digital modulation process, after constellation mapping and before pulse shaping, the symbols are upsampled with the number L(samples per symbol). At this moment, why symbol have to be upsampled, if the symbol rate and sample rate is same what…
agile
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why GMSK use a gaussian filter instead of raised cosine filter?

I'm wondering why GMSK use a gaussian filter instead of raised cosine filter as a pulse shaping filter? Is there special reason?
agile
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