![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1485647/image.png)
how to set the trellis structure according to the figure?
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i'm stuck by the implementation of turbo encoder. As this figure 3.11 showed,it's the structure of a Turbo encoder. it consists of two RSC encoders and Turbo interleaver. The structure of the RSC encoder is shown in figure 3-12. ![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1478821/image.png)
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1478821/image.png)
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1478826/image.png)
I checked the Matlab help for how to establish an encoder using poly2trellis, the website is: https://de.mathworks.com/help/comm/ref/poly2trellis.html
But it showed that, this kind of figure 3-12 can't be established with poly2trellis. I have no idea how to implement it.
Xiaotian Yu
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Brahmadev
le 18 Sep 2023
Hi Xiaotian,
I understand that you would like to build a non-recursive, non-systematic convolutional encoder. You can do so in Simulink using a Model as demonstrated below.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1485647/image.png)
You can also refer to the following documentation for examples on creation, validation, and testing of User Defined Trellis Structures:
For calling this model in MATLAB or running it programmatically, you can refer to the following documentation:
I hope this helped in your implementation of RSC encoder.
Regards,
Brahmadev
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