how to set the trellis structure according to the figure?

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.

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

Answer 1

[Brahmadev]

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.

You can also refer to the following documentation for examples on creation, validation, and testing of User Defined Trellis Structures:

https://www.mathworks.com/help/comm/ug/creation_validation_and_testing_of_user_defined_trellis_structure.html

For calling this model in MATLAB or running it programmatically, you can refer to the following documentation:

https://www.mathworks.com/help/simulink/ug/using-the-sim-command.html

I hope this helped in your implementation of RSC encoder.

Regards,

Brahmadev

[Xiaotian Yu]

Thank you so much!! It's really helpful