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  • matlab error:Subscripted assignment dimension mismatch.

    durga ch

    Member

    Updated: Oct 24, 2024
    Views: 1.2K
    now i am confused.
    i tried passing a BPSK signal through a convolutional encoder through trellis .
    but trellis accpets only binary so it rejected my BPSK input 😔

    so i positioned the trellis inbetween the data signal(binary) and the BPSK generator.

    i was thinking that encoding is encoding where ever i do.. but still it dint work.

    I dont know.. not very good at matlab.😔

    partial code posted:

    %creation of input signals
    for i=1:32
    message(i,1)=round(rand());
    end;
    %encoding the signal
    trellis=poly2trellis(3,[5 7]);
    coded=convenc(message,trellis);

    % Create input BPSK signal
    for i=1:64
    input(i,1) = (2*coded)-1;
    end

    the error while running this code is"Subscripted assignment dimension mismatch."

    I did Google and tried debugging... but invain

    can anyone help me out???
    0
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  • durga ch

    Member • Oct 30, 2008

    gotcha!!!

    the 'iput' was a function call and i was trying to use it as a variable so it dont work
    i changed it to
    input[];
    %creation of input signals
    for i=1:32
    message(i,1)=round(rand());
    end;
    %encoding the signal
    trellis=poly2trellis(3,[5 7]);
    coded=convenc(message,trellis);

    % Create input BPSK signal
    for i=1:64
    input(i,1) = (2*coded)-1;
    end


    and it worked .. 😀
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