Hello, I am using a matlab function "vitdec" to simulate viterbi decoding in awgn channel. I noticed a rather weird problem with it. When I...

Hello, I am using a matlab function "vitdec" to simulate viterbi decoding in awgn channel. I noticed a rather weird problem with it. When I increase the msglength the BER improves(eventually plateaus down), my understanding is that BEr improves with the traceback length. Attached is the matlab code and the BERs I observed, traceback length was fixed to 15 for a constraint length of 3. Is the...

Hi all, I wanted to use bi-lateral Z-transform, and esp. I wanted to use Inverse Bilateral Z-transform... But Matlab only provides...

Hi all, I wanted to use bi-lateral Z-transform, and esp. I wanted to use Inverse Bilateral Z-transform... But Matlab only provides Uni-lateral Z-transform and Inverse Transofrm through its "ztrans" and "iztrans" command pair... How to do Bi-lateral Z-transfrom using Matlab? Thanks a lot!

I'm trying to implement a digital down-conversion using the Xilinx DDC core on an FPGA. I have a question about generating the CFIR coefficients...

I'm trying to implement a digital down-conversion using the Xilinx DDC core on an FPGA. I have a question about generating the CFIR coefficients from Matlab when you want a decimation rate of 2 (or more) from the CFIR. Matlab won't allow you to directly generate the coefficients in xilinx format using the command 'coewrite(HCfir)' because it is a multi-rate filter object (not sure what the probl...

Hey I am trying to write my own FIR filter in MATLAB for a project I am working on with the aim of eventually porting the project over to c...

Hey I am trying to write my own FIR filter in MATLAB for a project I am working on with the aim of eventually porting the project over to c (so I cannot use MATLAB built-in functions). The filter is taking smaller chunks of a large chunk of data and filtering them separately so I need to be able to set the initial conditions. Has anyone any idea how MATLAB uses the initial conditions, zi, inpu...

hi ,everyone i want to know if matlab GUI can store and display some data achieved in functions that is, when i execute the GUI , some...

hi ,everyone i want to know if matlab GUI can store and display some data achieved in functions that is, when i execute the GUI , some data is created , then i want some place in the GUI to display the data can matlab GUI do this? thanks

Hi there, does anybody know, how to call a matlab function outside the current directory, i.e. something like [a,v]=...

Hi there, does anybody know, how to call a matlab function outside the current directory, i.e. something like [a,v]= ..\otherdirectory\function(b,d) Hope to get some help. This message was sent using the Comp.DSP web interface on www.DSPRelated.com

Hi, I was thinking that the peak value observed at the power spectrum for a single tone signal will be the same as its power, but I did not see...

Hi, I was thinking that the peak value observed at the power spectrum for a single tone signal will be the same as its power, but I did not see that when I coded it in matlab when verification. In the matlab code, I was expecting to see the peak power value of -3dB but what I observed is -9dB when using matlab function 'periodogram', and -11.8dB when I later coded the periodogram

Hello, I am trying to implement a frequency selective fading channel for a MIMO system. I am using the matlab function RayleighChan in...

Hello, I am trying to implement a frequency selective fading channel for a MIMO system. I am using the matlab function RayleighChan in Matlab. I need to get the channel co-efficients for a given sampling period, time delay, power delay profile, but this function returns only the path gain of the channel. Now, how do I get the channel co-efficients for the system? I really need to kno...

Hey all, I am having some trouble with AM demodulation using MATLAB. I used the built-in MATLAB function butter to design a low pass filter and...

Hey all, I am having some trouble with AM demodulation using MATLAB. I used the built-in MATLAB function butter to design a low pass filter and using the transfer function obtained, I filtered the modulated signal multiplied by the carrier. Here's the part of my m-file which deals with it: dam=cos(2*pi*250*t).*am; % am=amplitude modulated signal [b,a]=butter(5,250*2*Ts); %designing low pa...

Hi guys, I've designed an IIR filter in MATLAB. I used the filter values to write a code for Atmega8. What i used for filter input is the...

Hi guys, I've designed an IIR filter in MATLAB. I used the filter values to write a code for Atmega8. What i used for filter input is the output of a digital sensor. The filter is working pretty good in MATLAB but the filter code for Atmega8 gives a pure sinusoidal output (I couldn't do that if they would ask me to do). I couldn't find the cause of the problem, so I want to filter the output of...

Hi, I am trying to convert a FFT and IFFT Matlab code to C using the fftw libraries. Hoiwever, I am stuck at a particular step: The Matlab...

Hi, I am trying to convert a FFT and IFFT Matlab code to C using the fftw libraries. Hoiwever, I am stuck at a particular step: The Matlab command is: G = ifftn(P21,'symmetric'); ow do I convert this statement to C using the fftw library. I have tried the following steps: 1.I used fftw_plan_dft_2d to compute the FFT for a double array of size nx by ny. the FFT values match the Matlab values. I...

Hi, I am trying to model a 16bit DAC in MATLAB with its nonlinearities and practical impariments. Does anyone have any idea how to do this...

Hi, I am trying to model a 16bit DAC in MATLAB with its nonlinearities and practical impariments. Does anyone have any idea how to do this ? Thanks. Andy This message was sent using the Comp.DSP web interface on www.DSPRelated.com

Hi Can anybody please describe me how "interp1" command in matlab works on nonuniform data? Does anybody know its algorithm? How can...

Hi Can anybody please describe me how "interp1" command in matlab works on nonuniform data? Does anybody know its algorithm? How can one interpolate complex data on a nonuniform grid to a uniform grid without using matlab's interp1 command directly? Thanks Rose

Anybody have experiences in programming ezdspR2812 with matlab/simulink? I cannot run my simulink model on the dspR2812 board. Below message pop...

Anybody have experiences in programming ezdspR2812 with matlab/simulink? I cannot run my simulink model on the dspR2812 board. Below message pop when I tried to do that : --------- Error building Real-Time Workshop target for block diagram 'c2812pwmtest'. MATLAB error message: Error using ==> RTW.makertw.callMakeHook at 49 The call to ccslink_ert_make_rtw_hook, during the entry hook generated

Hello, would any one out there can help me how to appy IIR to filter an 256x256 image using IIR in Matlab? is there any function for it (I...

Hello, would any one out there can help me how to appy IIR to filter an 256x256 image using IIR in Matlab? is there any function for it (I mean 2 D IIR filter). I have to use a IIR filter to filter a image and it is required that I do it in Matlab. I have done it in C and using difference equation: y(m,n)=a1*x(m,n)+a2*y(m-1,n)+..... and everything is fine. Now I have to do it in ...

For learning use of the FFTW, i wrote a sample program,but campared with the result of Matlab,i find the ans are totally different. how can i...

For learning use of the FFTW, i wrote a sample program,but campared with the result of Matlab,i find the ans are totally different. how can i solve this problem ? thank u! i'm looking forward for ur answer. The result of Matlab: a=[1 2 3 1 2 3 1 2]; ans = 15.0000 -1.0000 + 0.5858i -1.0000 + 2.0000i -1.0000 - 3.4142i -1.0000 -1.0000 + 3.4142i -1.0000...

Hi. I did a simple test (1d fft) of some data with fftw and matlab. The results seem to differ. I wonder what am I missing? I need to port my...

Hi. I did a simple test (1d fft) of some data with fftw and matlab. The results seem to differ. I wonder what am I missing? I need to port my codes from matlab to a custom program. Many thanks for any help. fftw: fftw_complex *in, *out; fftw_plan p; int N = 16; in = (fftw_complex*) fftw_malloc(sizeof(fftw_complex) * N); out = (fftw_complex*) fftw_malloc(sizeof(fft...

hi thats your kindness we want to draw a shape such az circle with external device that connect to computer by parallel or serail port The...

hi thats your kindness we want to draw a shape such az circle with external device that connect to computer by parallel or serail port The only thing that we need is process of shape by matlab & send out of edge position tanks

Hi all, My question is about the neural network package in MATLAB. I need to train a not-fully connected network, with feedbacks (recurrent)....

Hi all, My question is about the neural network package in MATLAB. I need to train a not-fully connected network, with feedbacks (recurrent). But the main problem is that I need to constrain the weights (e.g. Wi,j=0 or > 0 or

Hi everyboby, I'm a matlab newbie and have problems with building a hilbert-spectrum in matlab. Perhaps someone can help me. I have two...

Hi everyboby, I'm a matlab newbie and have problems with building a hilbert-spectrum in matlab. Perhaps someone can help me. I have two vectors: time vector t a the signal vector x. First I compute the analytic signal z(t)=x(t)+i*y(t), where y(t) is the Hilbert Transform of x(t). The polar coordinate form of z with amplitude and phase is: z(t)=amplitude(t)*exp(i*phase(t)). I compute the ...