Hi folks, Can anyone help me explain why I get negative cross power spectral density (cpsd) values? I do my calculations in matlab (cpsd) and...

Hi folks, Can anyone help me explain why I get negative cross power spectral density (cpsd) values? I do my calculations in matlab (cpsd) and I always get positive values until now. Knowing the usefulness of it would greatly help me in my analysis. Regards, Ibra

hi, i'm trying to verify some other code i've written in c for calculating the covariance of 2 nxm matrices (n points in m dimensions (i.e....

hi, i'm trying to verify some other code i've written in c for calculating the covariance of 2 nxm matrices (n points in m dimensions (i.e. 3)) using matlabs cov() command, when i calculate say cov(a), the resulting matrix is mxm matrix and i verify that my results are the same as matlabs, but calculating the cov(a,b) of two different matrices or even cov(a, a) of the same matrix i ...

I'm working on processing, in MATLAB, some data that I've taken with a communication device we've built. Previously we've done communication with...

I'm working on processing, in MATLAB, some data that I've taken with a communication device we've built. Previously we've done communication with an on-off-keying signal (OOK with a laser). We wanted to estimate the SNR of the signal, so we use a data-aided approach. Now I'm changing the system to use complex signaling and I'm struggling with how to do the SNR estimation with complex signals. Prev...

Hi all How to remove how to remove zeros at last See the pic attached Regards Arul

Hi all How to remove how to remove zeros at last See the pic attached Regards Arul

hello, i wish to calculate the partial fraction expansion of: 1/((z-a)(z+3)(z-5)) it doesn't seem like i can do it using the residue()...

hello, i wish to calculate the partial fraction expansion of: 1/((z-a)(z+3)(z-5)) it doesn't seem like i can do it using the residue() matlab command, is there any way i can do this in matlab? many regards, juan

Hi everyone, im currently involved in some research concerning blind channel estimation in ofdm systems. Within this intercourse i stumbled...

Hi everyone, im currently involved in some research concerning blind channel estimation in ofdm systems. Within this intercourse i stumbled upon the paper "Blind OFDM Channel Estimation Using FIR Constraints: Reduced Complexity and Identifiability" (link http://www.ifp.illinois.edu/~singer/journalpapers/SongSinger07.pdf) , which describes a Finite Alphabet based Algorithm (in paper call...

Hi; I couldn't find where the error is. Loop element numbers are more than it must be. For example when; handles.UppWaveLen =...

Hi; I couldn't find where the error is. Loop element numbers are more than it must be. For example when; handles.UppWaveLen = 1.53 handles.LowWaveLen = 1.57 loop must be between 6369:6536 and there must be 168 elements of the for loop. But it writes in excel file 418 elements. Could anyone help me to find the error. Thanks in advance. k=1; for i=floor(10000/handles.UppWaveLen):1:c...

> Dear all, > > I am working on the PSD estimation of a topographic depth profile. > The problem that I am facing is that to convert...

> Dear all, > > I am working on the PSD estimation of a topographic depth profile. > The problem that I am facing is that to convert the frequency scale > to wavenumber scale which is considered more suitable. > > I am using Welch method which gives me absolute power w.r.t > frequency in radians. Here I am considering that the samples are > spaced by distance (50 meters) he

Hi, I?m trying to implement hilbert filter with a narrow ripple and my limited processing power. TW = 35; % Transition Width 35...

Hi, I?m trying to implement hilbert filter with a narrow ripple and my limited processing power. TW = 35; % Transition Width 35 Hz Apass = 0.02; % Passband Ripple (dB) -> variation 0.1% Fs = 1024; % Sampling Frequency h = fdesign.hilbert('TW,Ap', TW, Apass, Fs); Hd = design(h, 'equiripple'); Hhilb = FilterStructure: 'Direct-Form FIR' Arithmetic:

Hi... i'm using matlab to calculate de PSD using Welch method from a EEG record. I know that the frequencies goes from 0.5 to 15 or 30 Hz...

Hi... i'm using matlab to calculate de PSD using Welch method from a EEG record. I know that the frequencies goes from 0.5 to 15 or 30 Hz (max), as seen in the following image: http://images.elektroda.net/99_1279418678.jpg When i calculate in matlab the psd, i'm getting this: http://images.elektroda.net/99_1279418795.jpg My signal is sampled at 256 samples/second, 16 bit resolution...