Hi,
If you go to google and search under "least mean square" you can get a lot of information and some video lectures on youtube for LMS and MSE.
Also, the following book has an entire chapter on channel estimation using LMS and MSE with some matlab code for these two algorithms. I used them in my own implementation of the LTE PHY layer and work just fine. You can get the PDF file of the book on the Internet.
MIMO-OFDM WIRELESS COMMUNICATIONS WITH MATLAB by Yong Soo Cho, Jaekwon Kim, Won Young Yang, Chung G. Kang.
Good luck