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Wireless access networks have been more and more widely used in recent years, since compared to the wired networks, wireless networks are easier to install and use. Due to the tremendous practical interests, much research effort has been devoted to wireless access networks and great improvements have been achieved in the physical layer by adopting newer and faster signal processing techniques, for example, the data rate in 802.11 wireless Local Area Network (LAN) has increased from 1 Mbps in the early version of 802.11b to 54 Mbps in 802.11a.
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