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## Frequency (Doppler) shift problem

inHi 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

## .wav files

inOpening .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?

inHi, 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

inHi, 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...

## Wavelength Dependency in RF Propagation?

inIn 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 ...

## Laurel or Yanny

inhttps://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

## The zero-order hold

inText books are filled with info on the DAC zero order hold and it appears on the internet everywhere. Basically its TF is (1-exp(-sT))/s where T i...

Text books are filled with info on the DAC zero order hold and it appears on the internet everywhere. Basically its TF is (1-exp(-sT))/s where T i sampling interval. Usually they take 1-z^-1 in cascade with the system transfer function and 1/s is merged into the system. If the system is G(s) then they convert (1/s)G(s) to the z domain. Doesn't this seem a little old fashioned nowada

## Minimum ADC Sampling Rate / Symbol Rate for a PSK Modem with Time and Carrier Recovery.

inDear DSP Gurus, I have to demodulate a 50 MHz wide (3 dB bandwidth) OQPSK modulates Signal. The Signal properties are: OQPSK Modulated AWGN...

Dear DSP Gurus, I have to demodulate a 50 MHz wide (3 dB bandwidth) OQPSK modulates Signal. The Signal properties are: OQPSK Modulated AWGN channel Has Doppler Shift (5 KHz/sec max) Pulse shaping filtered (0.35) Viterbi+RS The HW I am using is: Zero IF Receiver ADC on I&Q channels (12 bit output) Has a signal processor (Output is IQ corrected,DC Removed,AGC) The Output is: I ...

## Differences between laplace transform, z transform and fourier transform

inHi All, I have studied three diff kinds of transforms, The laplace transform, the z transform and the fourier transform. As per my...

Hi All, I have studied three diff kinds of transforms, The laplace transform, the z transform and the fourier transform. As per my understanding the usage of the above transforms are: Laplace Transforms are used primarily in continuous signal studies, more so in realizing the analog circuit equivalent and is widely used in the study of transient behaviors of systems. The Z transform is the ...

## CIC Decimation Filter "zero crossing" distortion

inHi, I am designing a simple decimation filter, with decimation rate at 5 (1st stage) and 20 (2nd stage). N=2 and 3 for each stage. Bin=1....

Hi, I am designing a simple decimation filter, with decimation rate at 5 (1st stage) and 20 (2nd stage). N=2 and 3 for each stage. Bin=1. Bout=16. Input Sampling frequency at 50 KHz and output at 500 Hz. The fixed point matlab simulation (2's complement) shows that with Sinewave input at 5Hz, there are a few "flat" "zero" crossing points in each sinewave cycle. I check t

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