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    CDMA modelling in MATLAB

    Hi everybody,
    I want to model a cdma system using MATLAB/Simulink.
    can anybody help me...

    also i want to know about the walsh codes.

    thanks in advance.

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    Re: CDMA modelling in MATLAB

    Do you have the communications Toolbox? If so there are plenty of resources for generating spreading codes in there. Part of my masters project is simulating a CDMA system. If you want I can send you some basic simulink models.


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    Re: CDMA modelling in MATLAB

    Checkout the EDABoard Group:

    OFDM CDMA by MATLAB Only

    I've posted a few links to Matlab CDMA projects in the group threads already and have over a dozen more to post.

    The moderator Aya2002 is very knowledgable concerning CDMA and its simulation in Matlab. I sure if you were to contact him, he could help point you in the right direction.

    If I have time tomorrow, I'll post another five or six more links to Matlab/CDMA Projects I've come across.

    Ciao


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    Re: CDMA modelling in MATLAB

    @dionysian: thanx for your help. i'm having communication toolbox and blockset but actually i want to generate spreading codes using lfsr. please send simulink models to parmarjp[at]gmail[dot]com
    @bigdogguru: thanx. i'm facing problems in spreading the data spectrum and displaying it. whick block (in simulink) can i use to display the data spectrum and spreaded spectrum.



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    Re: CDMA modelling in MATLAB

    Is there a particular reason you want to use an actual LFSR? I know that is how its done in hardware but the communication toolbox has a block for Walsh codes in the sequence generators section. If all you care about is simulation there should be no reason not to use this block. As for displaying the spectrum I would recommended using the spectrum scope. I will look through some of my simulink models for a basic SS model I can send you.



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    Re: CDMA modelling in MATLAB

    i used lfsr to generate it. It is better to not use matlab built in functions. It made the final implementation in vhdl much much easier.






    i found a lot of modules in matlab to generate vhdl from simulink models/ matlab code. If someone has actually used them, please tell me how efficient those are.



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    Re: CDMA modelling in MATLAB

    cdma modelling would be better in simulink/matlab or labview?



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    Re: CDMA modelling in MATLAB

    Both matlab and simulink. I take some variables from workspace and it gives more flexibility.



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    Re: CDMA modelling in MATLAB

    Walsh-Hadamard codes are very simply generated codes used in CDMA downlink when transmission is synchronous, they are a set of perfectly orthogonal code generated as:

    H(0) = [1 1; 1 -1];
    H(n+1) = [H(n) H(n) ; H(n) -H(n)];



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    Re: CDMA modelling in MATLAB

    hi dionysian kindly send me basic simulink model my id is manish_dehariya@rediffmail.com



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    Re: CDMA modelling in MATLAB

    hello, please i need your help by sending me CDMA & D-TDMA simulink model by using DSS bookset,i am really need your help guys cause am doing my master research on new technology and i need your help in this matter....please you can send it to my e-mail : mushreq22@yahoo.com .....thanks a lot .



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    Re: CDMA modelling in MATLAB

    Actually i am using a shaker table assembly which is been connected to a auto-transformer... I am getting random vibrations by varying the auto-transformer and how to convert these waves into sine waves?

    ---------- Post added at 19:12 ---------- Previous post was at 19:10 ----------

    Is there any method to convert these waves into sine waves through Labview where i am getting the graphs.



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    Re: CDMA modelling in MATLAB

    to know basic about CDMA Spread Spectrum technical overview code devision multiplexing

    click on the link below

    http://nitinksaluja.blogspot.in/2012...le-access.html

    appreciable work



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    Re: CDMA modelling in MATLAB

    Quote Originally Posted by dionysian View Post
    Do you have the communications Toolbox? If so there are plenty of resources for generating spreading codes in there. Part of my masters project is simulating a CDMA system. If you want I can send you some basic simulink models.
    hello sir please send me ur basic block set of cdma...it might help me a lot...im working on cdma for my masters project


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    Re: CDMA modelling in MATLAB

    Quote Originally Posted by dionysian View Post
    Do you have the communications Toolbox? If so there are plenty of resources for generating spreading codes in there. Part of my masters project is simulating a CDMA system. If you want I can send you some basic simulink models.
    My project is simulation of CDMA too, can u send me u r matlab file, it would be a great help,



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    Re: CDMA modelling in MATLAB

    i will be grate if u can send me the models.

    - - - Updated - - -

    i will be grateful if u can send me the models.



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