Looking for books, course notes/slides, or some tutorials on decision feedback equalizers with in-depth details. I appreciate your help.
Not a comprehensive source of details, but for me this paper/tutorial has been the most helpful in terms of principles explanation. Also here you can find a basic working example of DFE implementation in python, that you may find helpful.
Here is some good material:
Cioffi https://cioffi-group.stanford.edu/doc/book/chap5.pdf
Vaidyanathan https://authors.library.caltech.edu/25063/1/S00086ED1V01Y200712SPR003.pdf