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Here is a diagram of MIMO 2X2 scenario. The implementation is using two antennas to receive downlink signals. The detailed discussion on the format of Downlink Frame format is also discussed.

LTE Downlink MIMO and frame format.

Downlink MIMO
LTE downlink by default requires MIMO 2x2 antenna configuration (In WiMax its optional). By MIMO 2x2 we mean 2 transmit antennas at the base station and 2 receive antennas at the mobile. Antenna configurations with MIMO 4x4 are also discussed in the standard.

In above LTE frame format the sub-carriers are highlighted in frequency domain and symbols in times domain. Control information is passed as PCFICH, PHICH, PDCCH. The data is passed as PDSCH. The reference signals for each MIMO antenna is also highlighted.
 
Similar concept can be extended for 4x4 MIMO.

LTE downlink frame format with reference signal allocations for two MIMO antennas.  

Evolved Packet Core (EPC) system architecture for all IP.

Mobility Management Entity (MME),

Serving System (S) Architecture (A) Evolution (E) Gateway or Serving Gateway SGW.

Packet Data Network (PDN) SAE Gateway

Enhanced Packet Data Gateway (ePDG)

Multiple antenna techniques - MIMO, Adaptive antenna systems - AAS and Antenna diversity - AD

LTE topics

What is LTE? Key driving factors behind 4G technology.

LTE Data rates and comparison with 3G rates.

Difference between air, radio and core network..  

Seamless mobility in 4G.

Cloud Computing ?
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