I'm trying to perform Gibbs sampling. I've written the algorithm but I'm not sure how to calculate the jump/step size so that successful...

I'm trying to perform Gibbs sampling. I've written the algorithm but I'm not sure how to calculate the jump/step size so that successful iterations would be independent (Gibbs is MCMC). I have the data using a step of 1 and I've calculated the autocorrelation of the data. So I thought the jump size is the size when the autocorrelation crosses the x axis but this value seems to depend on...

Hi, Is there a theoretical minimum for the sampling rate of the output y(t) in a SysId setup? I know that the input signal x(t) must contain...

Hi, Is there a theoretical minimum for the sampling rate of the output y(t) in a SysId setup? I know that the input signal x(t) must contain all frequency components ("persistently exciting") of the unknown filter. When using a simple LS method to solve for the coefficients, the overdetermined system of equations suggests that it is possible to drop rows (as long as there are enough line...

What kind of analog-to-digital converters are used for the VOICE signal in cell phones... Number of bits? Sampling rate? Architecture? What...

What kind of analog-to-digital converters are used for the VOICE signal in cell phones... Number of bits? Sampling rate? Architecture? What kind of analog-to-digital converters are used for the RADIO signal in cell phones... Number of bits? Sampling rate? Architecture? What kind of analog-to-digital converters are used for the ACCELEROMETER ETC. signal in cell phones... Number of bits...

Hi everyone, I must say that this question may sound pretty silly, but I honestly failed to find an answer. A couple of days ago I found an...

Hi everyone, I must say that this question may sound pretty silly, but I honestly failed to find an answer. A couple of days ago I found an 'old' oscilloscope in the lab which reported a 1 GHz bandwidth, but when we looked up the specs it reported a 20 MS/s sampling rate. Now, my background is probably not supporting me much here, but a 1 GHz bandwidth signal cannot be represented wit...

A problem I had while doing graphics, a short time ago, is that while doing repeated up/down-sampling cycles, there was continual degradation....

A problem I had while doing graphics, a short time ago, is that while doing repeated up/down-sampling cycles, there was continual degradation. This of course leads to the idea: a general framework for resampling that avoids this problem. Specifically, let M -> N denote the operation (and its matrix) for sampling from positive sizes M to N. The ideal situations are that: * M -> N s

Hi, I am trying to reconstruct bi-phase digital data from bi-phase analog signal. I am sampling analog signal at 4 times of actual data rate....

Hi, I am trying to reconstruct bi-phase digital data from bi-phase analog signal. I am sampling analog signal at 4 times of actual data rate. I am getting ADC output for each sampling instant. But, I have no idea about the bi-phase reconstruction logic from sampled ADC output. Any document document or suggestion would help me. Thanks in advance Rahul ______________________...

Hi, Sorry if this question is simple. I am trying to get this confusion out of my head. I have a hard time visualizing and understanding this...

Hi, Sorry if this question is simple. I am trying to get this confusion out of my head. I have a hard time visualizing and understanding this simpling question. Let's say that we have only one tone signal (eg. 100MHz). So, when you look in the frequecny domain you will see a tone at 100MHz. Now, when we do sample it let's say at 400MHz sampling frequency, why do we see tones at (400-100...

I am currently trying to simulate the s-curve of Gardner Timing algorithm. My simulation set-up is as follows, I am generating a QPSK signal...

I am currently trying to simulate the s-curve of Gardner Timing algorithm. My simulation set-up is as follows, I am generating a QPSK signal oversampled to a factor of 32. I am passing a received signal through a matched filter and then down-sampling the signal by 16 to get 2 samples/symbol required for Gardner TED. While performing down-sampling each time I am selecting 2 samples out of 32...

Is there really such a thing as a First Order Hold as you see in some textbooks? I have looked many times at DAC outputs and all I see are...

Is there really such a thing as a First Order Hold as you see in some textbooks? I have looked many times at DAC outputs and all I see are staircase type waveforms ie Zero-Order Holds. Also, with a high sampling rate the effect of the ZOH more or less vanishes - do we need to still analyse it? There is a phase shift of course which is important (-90 degrees at half sampling but this gets sma...

Hi, I am doing a baseband simulation for IEEE 802.11 g. The standard uses 64 IFFT length (3.2?s) and 20 Msamples per second. I think this result...

Hi, I am doing a baseband simulation for IEEE 802.11 g. The standard uses 64 IFFT length (3.2?s) and 20 Msamples per second. I think this result in one sample per symbol. I am wondering what the structure will be if I use 40 Msample per second, i.e will the IFFT size change, or interpolation will be used? or what is the effect of sampling frequency on the baseband simulation? Best Regards,

Hi, I'm quite new to IQ-data and signal processing in general and am having some problems regarding which sample rate I actually must use when...

Hi, I'm quite new to IQ-data and signal processing in general and am having some problems regarding which sample rate I actually must use when I sample a signal and want to get IQ-data after signal processing on an FPGA. Lets start with an example signal that goes from 0-10 MHz. Nyquist criterion=> fs > 20 MHz Question 1: Must I sample in 20 MHz and then mix and decimate to get 10MHz

Hi, I needed some help understanding a derivation in Mr. Oppenheim's book Discrete Time Signal Processing. In Edition 3, Chapter 4 Sampling of...

Hi, I needed some help understanding a derivation in Mr. Oppenheim's book Discrete Time Signal Processing. In Edition 3, Chapter 4 Sampling of Continuous Time Signals, 4.6.1 Sampling Rate Reduction, Page 180, Eq. 4.74, he replaced the variable of summation from r to i + kM. I didn't understand how he did it or why it is valid and I would appreciate it if someone could clarify it.

I am trying a simple example using frequency sampling. Therefore I have N=16 weights. W=[w0 w1.....w15] and I make then as follows W=[1 1 1 1...

I am trying a simple example using frequency sampling. Therefore I have N=16 weights. W=[w0 w1.....w15] and I make then as follows W=[1 1 1 1 1 0 0 0 0 0 0 0 1 1 1 1 ] as magnitude and the phase is -k*pi*(n-1)/N where k is from 0 to N/2 giving a frequency sampling complex vector of H=[h0 h1 h2 ....h15] Now according to textbooks I have to have conjugate symmetry but exactly how does t...

Dear All, In page 8 of http://www.cs.tut.fi/kurssit/TLT-5806/Synch.pdf it is stated: All-digital symbol timing recovery scheme requires...

Dear All, In page 8 of http://www.cs.tut.fi/kurssit/TLT-5806/Synch.pdf it is stated: All-digital symbol timing recovery scheme requires higher-than-symbol-rate sampling. If this statement is correct what should be the minimum ratio? We have also a constraint on the max sampling rate of the ADC. It is 2.2x symbol rate. If we sample at 2.2x symbol rate should we also adjust the Matched filter...

I have two 1MHz ADCs and would like to interleave them by a half of the sampling cycle in order to get a single ADC with effective sampling...

I have two 1MHz ADCs and would like to interleave them by a half of the sampling cycle in order to get a single ADC with effective sampling frequency of 2MHz (I want to oversample the signal by as much as possible). But the aliasing properties of the data stream will be as if the signal was sampled at 1MHz because the ADCs are independent blocks and don't influence each other, right? Bes...

Consider the Nyquist criterion for sampling a continuous=20 waveform - 2x bandwidth - then the Rayleigh resolution=20 principle - peaks must...

Consider the Nyquist criterion for sampling a continuous=20 waveform - 2x bandwidth - then the Rayleigh resolution=20 principle - peaks must separate by at least 1 wavelength. =20 Don't these look much analogous? =20 Especially as =CE=BB =3D 1/f Ruminating a bit more... Nyquist sampling can be=20 viewed as a mandate to sample each period, at least=20 twice. And, Rayleigh mandates that...

I have a sampled signal that was HP-filtered before sampling. Is there a way to revert the signal back to its pre-HP-filtered state? I know...

I have a sampled signal that was HP-filtered before sampling. Is there a way to revert the signal back to its pre-HP-filtered state? I know it is impossible to restore the DC-component of the signal. But we can assume it is 0V. I MATLAB script to show how the signal x looks HP-filtered: % % Butterworth Highpass filter designed using FDESIGN.HIGHPASS. % All frequency values ar...

How to design Decimator with the extra filter A(z) at the output and Interpolator with the extra filter A(z) at the input. .. x(n) is the...

How to design Decimator with the extra filter A(z) at the output and Interpolator with the extra filter A(z) at the input. .. x(n) is the input Fs = 24 in the input sampling rate M= 6 is the number of subfilter In case decimator A(z) is operated at output sample rate . as Fs/M ..where M is 6 .Fs is the input sampling rate. In case Interpolator A(z) is placed at the input and operates at in...

Further to Robert's peer review, and the then swapping around of the multiply / divide words. hopefully correct at last...

Further to Robert's peer review, and the then swapping around of the multiply / divide words. hopefully correct at last ... -----ooooo----- Revised after peer review, approached with a little less haste So... Sampling with a period of T is given by (after asciification) as .. (T)sum (n : 0, inf)(d(t-nT) * f(nT) ) ... with * representing multiplication and not convolution as w...

Hello, I am curious as to why sampling parameter is important while designing a filter. I guess, it is sufficient that the original signal has...

Hello, I am curious as to why sampling parameter is important while designing a filter. I guess, it is sufficient that the original signal has been sampled at a sufficient rate. --------------------------------------- Posted through http://www.DSPRelated.com