基于IEEE802.11的速率自适应算法研究  

Research on rate adaptation algorithm based on IEEE802.11

作　　者：张建军[1] 唐雅娟[1] 

机构地区：[1]汕头大学工学院,广东汕头515063

出　　处：《重庆邮电大学学报（自然科学版）》2009年第5期599-607,共9页Journal of Chongqing University of Posts and Telecommunications(Natural Science Edition)

基　　金：广东省高等学校产学研结合示范基地项目(cg-zhzd0717)

摘　　要：目前IEEE802.11设备提供了多个不同的传输速率,对动态变化的无线信道选择不同的传输速率可以使系统性能最大化。目前已经有许多速率自适应算法被提出,但是没有一种算法适用于所有环境下的动态变化无线信道,而不同工作环境下需要选择不同种类的速率自适应算法。概述了不同种类的速率自适应算法,剖析了每种算法影响其性能提高的因素,并对不同种类的算法进行了对比,最后提出了现有速率自适应算法所存在的问题。此外,用NS-2(Network Simulator version 2)仿真软件验证了RTS/CTS(Request-to-Send/Clear-to-Send)信号的作用,它的启用会降低系统频带利用率,但同时也能有效地消除由多个移动终端共用一个AP(access point)引起的碰撞。Today＇s IEEE 802.11 devices provide multiple transmission rates, so the different rates can be exploited in an adaptive manner depending on the underlying channel condition in order to maximize the system performance. Many rate adaptation algorithms have been proposed so far. However, there is no algorithm that suits for any underlying channel condition. In this paper, different kinds of rate adaptation algorithm were surveyed and compared, and the factors affecting the performance of rate adaptation were analyzed. Then, the problems for existing rate adaptation algorithms were discussed. Besides, Network Simulator version 2（NS-2） was used to verify the usage of Request-to-Send/Clear-to-Send （RTS/CTS）. It can lower the bandwidth efficiency and effectively eliminate collision caused by multiple mobile terminals using one access point.

关 键 词：速率自适应算法 IEEE802.11 WLAN 信噪比 

分 类 号：TN925.93[电子电信—通信与信息系统]