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Wireless Local Area Networks (WLANs) have become a ubiquitous high-speed data access technology. The recent IEEE 802.11e standard provides Quality of Service (QoS) support, and the pending 802.11n standard further increases the transmission rate by using the Multiple-Input-Multiple-Output (MIMO) technique. Multiple antennas can be used to improve the performance gain by either increasing the transmission reliability through spatial diversity or increasing the transmission rate through spatial multiplexing. This new characteristic at the wireless physical layer requires the corresponding adaptation at the Medium Access Control (MAC) layer to reach the best performance gain.
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