matlab error:Subscripted assignment dimension mismatch.

durga ch

durga ch

@durga-TpX3gO • Oct 24, 2024
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???
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  • durga ch

    durga ch

    @durga-TpX3gO • 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 .. 😀
    0