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IEEE 802.11ac standard has newly adopted a DownLink Multi-User Multiple-Input and Multiple-Output (DL-MUMIMO) scheme. For user multiplexing in downlink WLAN, the authors can also use a frame aggregation scheme for multiplexing multiple users' data with Space-Time Block Coding (STBC) for achieving spatial diversity. They compare the performance of the two downlink user multiplexing schemes: multi-user MIMO and frame aggregation in IEEE 802.11ac. If each user's encoded data stream has a similar length, the multi-user MIMO scheme yields better average throughput than the frame aggregation scheme.
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