基于模糊逻辑的多速率WLAN自适应MAC协议  

An Adaptive MAC Protocol with Fuzzy Logic in Multi-rate WLAN

作　　者：段中兴[1] 张德运[1] 

机构地区：[1]西安交通大学电子与信息工程学院

出　　处：《计算机工程》2006年第3期113-115,121,共4页Computer Engineering

基　　金：国家"863"计划基金资助项目(863-301-05-03)

摘　　要：针对DCF应用在多速率无线局域网中存在吞吐量异常和严重不公平性问题,提出了一个基于信道状态和节点速率的模糊自适应退避算法——RCFAB算法。仿真结果表明,RCFAB能够适应多速率WLAN,并有效地改善系统的吞吐量和接入公平性。Distributed coordination function（DCF） is basis access mechanism in the IEEE 802.11 MAC protocol. Research shows that the DCF performs unfairly and anomaly within multi-rate wireless LANs. A new adaptive backoff algorithm based on rate and channel state with fuzzy logic control is proposed. By doing this, an appropriate CW value can be got to reduce the collision and improve the performance of CSMA/CA and RTS/CTS. Simulation results show that the fuzzy logic control method can not only reduce the packet collision, but also enhance the performance and fairness of CSMA/CA and RTS/CTS.

关 键 词：多速率无线局域网 分布式协调功能 模糊自适应控制 公平性 

分 类 号：TP393.04[自动化与计算机技术—计算机应用技术]