基于802．11的混合链路调制速率自适应算法研究  

Research on mixed rate-adaptive algorithm based on IEEE802.11

作　　者：曹登昊[1] 鄢楚平[1] 王朝翔[1] 刘芳[1] 

机构地区：[1]华北计算技术研究所,北京100083

出　　处：《计算机工程与设计》2011年第6期1898-1900,1905,共4页Computer Engineering and Design

摘　　要：为了解决当前许多基于IEEE 802.11标准的速率自适应协议所面临着的快速变化链路中的切换滞后问题、碰撞问题及重复速率抖动问题,提出了一种混合速率自适应算法(MRA)。MRA算法通过高优先级速率自适应算法(HPRA)快速获得非最优化的传输速率来解决快速切换问题,通过低优先级速率自适应算法(LPRA)在一定时间后获得最优化的传输速率,其中利用获得的SNR参数减小碰撞问题带来的影响,并建立短时间内出现反复速率切换便在一定时间内禁止切换的机制来避免重复速率抖动问题的出现。仿真实验结果表明,无论在快速变化的链路中还是在相对平静的链路情况下,该算法的性能较当前的知名算法都有明显的提高。To solve fast switch rate problem, collision problem and repeat rate jump problem in many rate adaptive protocols based on IEEE 802.11, a new algorithm called MRA is proposed. MRA is an algorithm that obtains a non-optimal modulation rate directly through HPRA which could solve the fast switch problem, and obtains an optimal modulation rate through LPRA in a longer period of time than theformer, whichusesSNRt^s~~vec~~~isi^npr^b~emandusesthemechanismthatf^rbiddingswitchifrepeatratejumphappen. Simu- lations show that MRA has obviously higher performance than RRAA both in fast-changing links and in relatively stable links.

关 键 词：IEEE802.11 多速率 自适应 丢帧率 信噪比 混合速率自适应算法MRA 重复速率抖动RRJ 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]