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详细说明： 有点老了，GOOGLE来的文章 THE IEEE 802.11 [1] is the first international standard for wireless local-area networks (WLANs) and it has been used widely in most commercialWLANproducts available in the market. The IEEE 802.11 MAC specifies two different medium access control (MAC) mechanisms in WLANs: the contention-based Distributed Coordination Function (DCF) and the polling-based Point Coordination Function (PCF). At present, only the mandatory DCF is implemented in the 802.11-compliant products.The802.11 physical layers (PHYs) provide mu ltiple data transmission rates by employing different modulation and channel coding schemes. For example, the IEEE 802.11b PHY [2] provides four PHY rates from 1 to 11Mbpsat the 2.4GHz band and most 802.11 devices available in the market are based on this PHY. Recently, another emerging high-speed PHY, the IEEE 802.11aPHY[3], has been developed to extend the IEEE 802.11 in the 5GHz Unlicensed National Information Infrastructure (U-NII) band and provides eight PHY modes with data transmission rates ranging from 6Mbpsupto 54Mbps.While the first generation 802.11a products are available in the market, the 802.11a PHY receives more and more attention thanks to its higher transmission rates as well as the cleaner 5GHz operational frequency band. ...展开收缩
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