How do I write the code for a RC (Raised Cosine) filter?

...and apply it to a bitstream that has been modulated with a 16QAM constellation?

Answer 1

[Arturo Moncada-Torres]

I suggest you to use MATLAB's Filter Design and Analysis Tool. Just type in the console

fdatool

You can select the filter with the characteristics you want and generate the corresponding m-file for it.

Hope it helps ;-) !