Consider a four-input, one-output nonlinear system, say an amplifier. I have available the four power spectral density (PSD) curves for...

Consider a four-input, one-output nonlinear system, say an amplifier. I have available the four power spectral density (PSD) curves for the four pseudo-random input signals, and also the PSD, P(f), of the output signal, where the independent variable f is frequency. I would like to know if it is possible to determine the amount of power present in the output signal that is due to nonlinea...

> Consider a four-input, one-output nonlinear system, say an amplifier. > > I have available the four power spectral density (PSD) curves...

> Consider a four-input, one-output nonlinear system, say an amplifier. > > I have available the four power spectral density (PSD) curves for the > four pseudo-random input signals, and also the PSD, P(f), of the > output signal, where the independent variable f is frequency. > > I would like to know if it is possible to determine the amount of > power present in the output signal that is

Hi there, I am working on spectral shaping coding. I did construct a code book which generate for me nulls at 1/3 and 2/3 of my sampling...

Hi there, I am working on spectral shaping coding. I did construct a code book which generate for me nulls at 1/3 and 2/3 of my sampling frquency besides it is a DC free code. I using a software for power spectral density to see how my spectrum looks like. My problem is that when I use the continuous power spectral density I get the 1/3 and 2/3 nulls. And when I used the discreat power sp...

pls can any body make me understand difference between power signals & Energy signals. why r random signals called power signals. This...

pls can any body make me understand difference between power signals & Energy signals. why r random signals called power signals. This message was sent using the Comp.DSP web interface on www.DSPRelated.com

Hi everyone, I just started with DSP and basically I am trying to go through the material on my own and I am finding it kind of...

Hi everyone, I just started with DSP and basically I am trying to go through the material on my own and I am finding it kind of difficult. I was going through the section on Power of a signal. I understand that the power of a digital signal is defined by the sum of the square of all the signal values. Then I had an exercise question, where the given signal was: y = ASin(wt). Now what ...

I have been looking at the many low power single chip processors available. But most are only 16 Mhz. I know that the higher the speed the more...

I have been looking at the many low power single chip processors available. But most are only 16 Mhz. I know that the higher the speed the more the current. Are there any low power DSP chips available that compare to TI MSPxxx ? Thanks

Hi On some of the 21161 based boards in my application I see a problem such that the chip does not power-up properly every time. I don't...

Hi On some of the 21161 based boards in my application I see a problem such that the chip does not power-up properly every time. I don't know what exactly happens, but the DSP is not running as expected and it *can't* be brought out of that state by a hardware reset. Power cycling is the only way to cure it. Does anybody have an idea what that could be? I checked all the unused pins for...

Dear all, Hi, I want to do some work in the field of "application of filter bank design in electrical power quality analysis". kindly...

Dear all, Hi, I want to do some work in the field of "application of filter bank design in electrical power quality analysis". kindly suggest me the different options available in the latest trands in the field of power quality analysis with the application for filter bank design. regards

Does the basestation vary the transmit power of PDCH downlink bursts on the same phyisical channel (time slot) depending on which MS it is...

Does the basestation vary the transmit power of PDCH downlink bursts on the same phyisical channel (time slot) depending on which MS it is intended for, or is the DL transmit power constant for all bursts on single PDCH channel? thanks. @8631000@

Does anyone know of a PSD calculating routine other than in Matlab? I'm trying to find something I can include into vb 6.0 or...

Does anyone know of a PSD calculating routine other than in Matlab? I'm trying to find something I can include into vb 6.0 or vb.net...perhaps a dll, activeX, or the code itself! Unfortunately I'm not versed in the realms of PSD enough to write my own. I do use a routine from national instruments DSP toolbox called Auto Power Spectrum which gives the auto power spectrum (whatever that is) i...

hi I need to do an analysis on computation power spent in sensor networks (general architectures) for computation of certain...

hi I need to do an analysis on computation power spent in sensor networks (general architectures) for computation of certain mathematical functions for certain number of times, in individual motes/over the network. I need some good references. Any links? (i dont want those who just discuss their computation constraints, rather, give some actual data of power consumed per computation, e.g pow...

Hi guys, Does anyone know how to solve this problem: A zero mean stationary signal having a correlation matrix R is applied to a FIR filter...

Hi guys, Does anyone know how to solve this problem: A zero mean stationary signal having a correlation matrix R is applied to a FIR filter with coefficient vector w. Show that the average power of the filter output is given by w'Rw. Find also an expression for the output power spectrum using the elements of w and R. What would be the output power spectrum if the FIR filter coefficients are s...

Dear All, How to find a random signal vector whose power spectral density is known?? As we know FFT of auto correlation of any signal gives...

Dear All, How to find a random signal vector whose power spectral density is known?? As we know FFT of auto correlation of any signal gives its power spectrum. If I go in the reverse direction, one solution could be, calculating IFFT and then reverse process of auto correlation. but I have no idea on how to find the reverse of auto correlation in matlab. any suggestions????? Kind reg...

Hi all, I heard we can obtain the phase difference between two signal from cross power spectrum. If someone knew, could you show me how to...

Hi all, I heard we can obtain the phase difference between two signal from cross power spectrum. If someone knew, could you show me how to obtain the phase difference ? I mean the algorithm. I read the cross power spectrum is defined as FFT (A) FFT*(B) / N^2, so we have real and imaginary components. Thanks, Titi

Here is an FFT bin interpolator I have been using with great success. It is based on the standard quadratic interpolation formula: float...

Here is an FFT bin interpolator I have been using with great success. It is based on the standard quadratic interpolation formula: float CalcFFTInterpolation(float yPrecedingPower, float yMaxPower, float yFollowingPower) // yMaxPower is the power amplitude in a local peak // yPrecedingPower is the power amplitude of the preceding bin // yFollowingPower is the power amplitude of...

Hi, for the following code in matlab: t = (0:0.00048828:1); y = sin(2*pi*12*t); z = abs(fft(y)); power = z(12) which I hope produces a...

Hi, for the following code in matlab: t = (0:0.00048828:1); y = sin(2*pi*12*t); z = abs(fft(y)); power = z(12) which I hope produces a second of data for a sine wave at 12 Hz, sampled at 2048 per second, and 'power' is equal to the power of 12 Hz. Unfortunately, figure; plot(z) shows clearly that the peak is at 13, instead of 12, Hz. Also, if I try 10 seconds of data, t ...

Hi there, Look at this code: yn = chirp(T,f0,t2,f1,'quadratic'); noise = randn(size(yn)); y = yn + k*noise; I need SNR: SNR =...

Hi there, Look at this code: yn = chirp(T,f0,t2,f1,'quadratic'); noise = randn(size(yn)); y = yn + k*noise; I need SNR: SNR = 10*log10((1/sqrt(2))/k) [dB] Is this correct? I assume that my signal power is 1/sqrt(2) and noise power is k, but I'm not sure...

Hie all, I am now doing the OFDM Simulation for Power Line Communication. I have written a very simple code for OFDM and have the impulse response...

Hie all, I am now doing the OFDM Simulation for Power Line Communication. I have written a very simple code for OFDM and have the impulse response of the power line channel. I am facing the problem that the BER of my result are high and constant along the SNR. So I would like to know whether my simulation is correct or not, and hope that someone can give me an advice on the simulations. I am using...

Hi all, I have a time series of 2900 elements. I want to apply the Power Spectra Distribution. I want to know if someone knows a Practical...

Hi all, I have a time series of 2900 elements. I want to apply the Power Spectra Distribution. I want to know if someone knows a Practical Guide for interpretating the results (or some pitfalls that can happens when getting the Power Spectra) Thanks, Alex

I was looking at this link http://www.prosig.com/signal-processing/CorrelationExample.html and is says that for a system with excitation x...

I was looking at this link http://www.prosig.com/signal-processing/CorrelationExample.html and is says that for a system with excitation x and output y that the transfer function is found to be H(f)=Gxy(f)/Gxx(f) where Gxy is cross power spectrum and Gxx is auto power spectrum. Trouble is - H(f) must be uncausal (or unstable) since Power spectrum has poles in the right half plan...