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MIMO: Multiple Input Multiple Output Antennas.
By using MIMO as well as other antenna systems, asymmetric allocation of frequency spectrum in multi-carrier cells, higher data speeds are forecasted.
HSPDA (High Speed Downlink Packet Access) was released in 3GPP-Third Generation Partnership Project Release 5 for indoor and urban outdoor high-speed data access at 10 MBPS (Mega Bits Per Second) range (14.4 MBPS theoretical). SDMA (Space Division Multiple Access) or SDM (Space Division Multiplexing) can be used to increase the downlink cell throughput by scheduling packets to users served by different beams. This limits mutual interference between these users making it possible to reuse the same channelization code resources. Beamforming is used to increase throughput by user-specific beamforming and beamforming with a grid of fixed beams (using a dedicated scrambling code which can be assigned to each beam making a channelization code tree in each beam).
Thomas B. Cross