衰落信道中802.11 DCF的非饱和吞吐量分析  

Non-saturation throughput analysis of 802.11 DCF in fading channel

作　　者：杨卫东[1] 李亚辉[1] 马建峰[1] 

机构地区：[1]西安电子科技大学计算机网络与信息安全教育部重点实验室,西安710071

出　　处：《吉林大学学报（工学版）》2008年第3期695-699,共5页Journal of Jilin University:Engineering and Technology Edition

基　　金：国家自然科学基金重大研究计划项目(60633020);国家自然科学基金项目(60573036)

摘　　要：利用时间离散的三维马尔可夫链,建立了衰落信道中IEEE 802.11 DCF(分布式协调功能)在非饱和状态下的吞吐量性能模型,分析了位错误率、传输负载和分组长度对系统吞吐量的影响。基于该模型,推导了根据信道质量,计算分组长度最优值的简单公式。仿真结果表明,模型能够有效地预测802.11 DCF在衰落信道下的非饱和吞吐量,采用最优分组长度可以提高系统吞吐量。Using a three dimensional Markov chain, a non-saturation throughput performance model was proposed for IEEE 802. 11 Distributed Coordination Function （DCF） in fading channel. The impacts of different factors, including bit error ratio, traffic loads and packet length, on the throughput of the system were analyzed using this model. Based on the model, a simple formula was derived to calculate the optimized packet length for maximizing the non-saturation throughput. Simulation results show that this model can effectively predict the non-saturation throughput of 802. 11 DCF in fading channel, and by employing the optimum packet length the system throughput can be enhanced.

关 键 词：计算机系统结构 衰落信道 分布式协调功能 吞吐量 

分 类 号：TP309[自动化与计算机技术—计算机系统结构]