关键词: 无线局域网 IEEE802．11a 链路自适应 MPDU DCF

Abstract:

Recently, with the introduction of the high-speed WLAN physical layer, link adaptation to dynamically select the PHY mode has been recognized as an ef fective way to improve system throughput. In this paper, we provide two link adaptation algorithms based on the IEEE802. 11a DCF mechanism. With the the oretical analysis and simulation, we conclude that the MPDU-based link adaptation algorithm outperforms the MSDU-based one. Based on the MPDU-based algo rithm, we propose a simple table lookup using the system status as the index to select the most appropriate PHY mode for transmission. Then we discuss the building process of the PHY mode table in detail

Key words: （WLAN, IEEE802. 11a, link adaptation, MPDU, DCF）