LTE MIMO, how does it work?

Dear all,

As I know LTE should support LTE. I have several quesitons about MIMO. I hope anyone could answer me. For MIMO configuration, do all paths need to work in the same frequency band? Or, each path could work in different frequency bands?
In the transceiver design point of view, if there contained 4 antenna ports for MIMO usage, did the transceiver chip also has 4 same transceiver chips on the die?

Thanks

wccheng

Firstly, go through some books on space time coding...all these questions will be automatically answered...
I prefer Haffarkhani's book on space time coding..