Frequency (Doppler) shift problem

Started by Anonymous in comp.dsp3 months ago 7 replies

Hi all, I am processing satellite transmissions and assume no prior knowledge of the Doppler shift. Using a brute force technique I have been...

Hi all, I am processing satellite transmissions and assume no prior knowledge of the Doppler shift. Using a brute force technique I have been able to extract coarse Doppler and fit a polynomial. I wish to be able to use the polynomial to remove the Doppler components from the signal but have come up against a problem. Below is some (modified) code which illustrates the issue I'm


charge pump related loop simulation in PLL

Started by fl in comp.dsp4 months ago 2 replies

Hello all: Though my question is not in the strict DSP, I cannot find another appropriate forum to discuss about it. As a hobby, I am interested...

Hello all: Though my question is not in the strict DSP, I cannot find another appropriate forum to discuss about it. As a hobby, I am interested in a PLL simulation. On numerous tutorials, I know there are current sources in a charge pump type phase detector. I realize that the current source makes the voltage cross the capacitor linearly increase. It is seen the Laplace transform of the RC ...


Does decimating after Sampling mean loss of data?

Started by Mehtap özkan in comp.dsp4 months ago 1 reply

Dear All, I use an AD9371 board and on it the ADC samples the input at 1228 MHz, then the sampled data is decimated by 5 and a downsampling FIR...

Dear All, I use an AD9371 board and on it the ADC samples the input at 1228 MHz, then the sampled data is decimated by 5 and a downsampling FIR filter reduces the output rate to 122.8 MSPS. This is what I have as an input to the FPGA where demodulation occurs. The signal to be demodulated is an 80 MHz wide QPSK modulated one. For ideal demodulation I need a 320 MSPS (x4 symbol rate). My quest...


Wavelength Dependency in RF Propagation?

Started by Randy Yates in comp.dsp4 months ago 9 replies

In an article in a recent issue of Microwaves & RF magazine, Jack Browne makes the following statement: Frequency plays a part in any link...

In an article in a recent issue of Microwaves & RF magazine, Jack Browne makes the following statement: Frequency plays a part in any link budget, especially for longer links, since long-distance links require the LONGER PROPAGATION DISTANCES of larger-wave-length, lower-frequency signals rather than smaller-wavelength, higher-frequency signals. (emphasis mine). I was miffed ...


Wavelength dependency -2

Started by Anonymous in comp.dsp4 months ago 1 reply

I enjoyed the article referenced below and noted that it said that 60GHz is the frequency which Oxygen molecules absorbed RF. Presumably other...

I enjoyed the article referenced below and noted that it said that 60GHz is the frequency which Oxygen molecules absorbed RF. Presumably other molecules have other frequencies, maybe some of them unknown at present which do the same thing. Can we therefore do the frequency response of an unknown Gas by passing RF through it? In that way finding chemical composition Thanks


is true "Ormsby" filter trapezoidal /?\

Started by Anonymous in comp.dsp4 months ago

I was looking through some open-source package, wherein the band-pass filter is described as ORMSBY. However, it has Hanning tapers, presumably...

I was looking through some open-source package, wherein the band-pass filter is described as ORMSBY. However, it has Hanning tapers, presumably to reduce the ringing/sidelobes in time domain. So is the name ORMSBY rather loosely defined?


.wav files

Started by Saagar CD in comp.dsp4 months ago 4 replies

Opening .wav file as a txt , displays a lot of characters. Please Teach me How to read them.

Opening .wav file as a txt , displays a lot of characters. Please Teach me How to read them.


What happens to the autocorrelation when the underlying signal is squared/cubed?

Started by Peter Mairhofer in comp.dsp5 months ago 3 replies

Hi, Suppose I have the autocorrelation function which results from Gaussian white noise passing through a 1st order LTI system,...

Hi, Suppose I have the autocorrelation function which results from Gaussian white noise passing through a 1st order LTI system, analytically: Ryy(tau) = 1/RC sigma^2/2 exp(-|tau|/RC) How does Rzz(tau) look when z=y^3 ? Peter PS: In the absense of the LTI system, trivially Rzz=delta(0) * 15*sigma^6/2 ... from E((x^3)^2)=E(x^6)=15*sigma^6


In memoriam - Vladimir Vassilevsky

Started by Rick Lyons in comp.dsp5 months ago 28 replies

Hi, In the Russian culture it's traditional to formally remember a deceased family member, or friend, 40 days after the day of their...

Hi, In the Russian culture it's traditional to formally remember a deceased family member, or friend, 40 days after the day of their passing. Today it's been 40 days since Vladimir Vassilevsky left this world. My memory of Vlad, as his friends called him, is that he was a highly skilled engineer. Over the years of exchanging signal processing ideas with Vlad I had the distinct...


Laurel or Yanny

Started by Randy Yates in comp.dsp5 months ago 14 replies

https://en.wikipedia.org/wiki/Yanny_or_Laurel Is this for real? All I hear is unambiguously "Laurel." Are there any objective, scientific...

https://en.wikipedia.org/wiki/Yanny_or_Laurel Is this for real? All I hear is unambiguously "Laurel." Are there any objective, scientific analyses exploring this (alleged) ambiguity? -- Randy Yates, DSP/Embedded Firmware Developer Digital Signal Labs http://www.digitalsignallabs.com


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