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The IEEE 802.11-based Wireless Local Area Networks (WLANs) are widely used for high-speed wireless data access. With the recent 802.11e Quality-of-Service (QoS) extension, real-time applications such as voice over IP and video streaming are finding their way to be running over WLANs. The recent 802.11n proposal aims to provide higher throughput support for bandwidth-intensive multimedia applications. It uses the Multiple-Input-Multiple-Output (MIMO) technology at the physical layer to increase the transmission rate. MIMO introduces several new features at the physical layer such as the spatial diversity and spatial multiplexing gains.
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