Spatial-Division Multiple-Access (SDMA) is a technique that allows multiple independent transmissions between a wireless Access Point (AP) having multiple antennas and other wireless devices (mobile stations). SDMA provides a performance advantage by enabling the access point to transmit and receive signals to/from multiple stations simultaneously using different spatial channels, which increases throughput of the existing Wireless Local Area Networks (WLANs). However, a need exists for SDMA to mitigate unused channels in uplinks and downlinks.
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