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Home Multi Antenna MIMO MIMO DL Frame LTE Uplink MIMO AAS Antenna Diversity LTE HARQ HARQ Type II ARQ vs. HARQ
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Here is a diagram of downlink MIMO 2X2 scenario. The implementation is using two antennas to receive downlink signals. The detailed discussion on the format of Downlink Frame
LTE Downlink MIMO and frame format.
Control - PCFICH, PHICH, PDCCH
Data - PDSCH
Reference signal - MIMO Antenna 1
Reference signal - MIMO Antenna 2
TS - Time Slot (0.5 ms)
LTE frame 2
LTE frame 1
LTE frame n-1
LTE frame n
Sub Frame 1
Sub Frame 2
Sub Frame 3
Sub Frame 9
Sub Frame 10
TS0
TS1
TS2
TS3
TS17
TS18
TS19
TS20
10 ms
1 ms
0.5 ms
Time slot = 0.5 ms
Frequency
Time
Time slot = 0.5 ms
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.  
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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 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.
LTE - Long Term Evolution topics from here