fixdt outof bounds error for data conversion block

Question

Varun 2025-11-6

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https://ww2.mathworks.cn/matlabcentral/answers/2181087-fixdt-outof-bounds-error-for-data-conversion-block

评论： Kranti Balaga 2025-11-27，10:21

An error occurred during simulation and the simulation was terminated

Caused by:

Input value of block 'dvbs2hdlLDPCEncoder/DVB-S2 LDPC Encoder/Parity Address Generator/ramLUT1' exceeds range of breakpoint vector for dimension 2.

my fixdt(0,4,0) for conversion block is camped to 13 matching the maximum column dimension of my ramLUT 2-D. Still it throws me this error.

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Kranti Balaga 2025-11-27，10:21

Hi Varun,

Since this example supports the DVB-S2 standard, the LDPC encoder is implemented using the specific parity-check matrices defined in the standard. If you modify anything inside the model, the simulation behavior may become invalid.

Could you elaborate on your issue? Under what circumstances are you encountering this error, and which version of MATLAB are you using? This information will help me assist you better.

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