General CRC Generator - How to determine generator polynomial

Hello everyone,

In my current project I have to perform a CRC check. At first I had to do this using a regular block diagram, but now I would like to use the CRC generator block provided by Matlab. Unfortunately, I don't know how to determine the polynomial from a given block diagram.

Like here in the example: How do I get the given polynomial from the diagram? (https://de.mathworks.com/help/comm/ref/generalcrcgenerator.html#)

Answer 1

[Piyush Kumar]

Hi Pascal,

If you double click on the "General CRC Generator" block to get the "Block Parameters", you will find the generator polynomial.

I found this from the Parameters sections of the documentation for the block.

[Pascal Viertel]

My question is how I can get from here:

To here:

So basically how is it possible to determine from a given blockdiagram the generator polynomial.

[Piyush Kumar]

If you refer to the "Algorithm section" and check the algorithm for "Indirect CRC Algorithm", it has explained the steps involved in detail. There is also a diagram. I am talking about this documentation link.