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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
SDMA scheme is shown in practical implementation below where a base-station is serving 3 mobile subscribers.
This is a beam-forming technique and focuses on using multiple antennas to adapt the signal energy in certain direction dynamically.

Two parameters are dynamically changed in AAS. Beam angle and beam width.

To support multiple mobile subscribers in a single sub-channel a technique know as SDMA is used. SDMA stands for Space Division Multiple Access. It uses non-orthogonal approaches such as super-position coding.
AAS - Adaptive Antenna Systems