摘要
速率自适应作为多速率无线局域网必不可少的一种机制,决定着系统的性能.针对IEEE 802.11ac协议,以不改变MAC帧格式为前提,提出了一种基于接收端信息反馈的高效速率自适应算法.算法的基本思想是,通过RTS帧实时准确地估计当前信道状况,然后将选择的最佳发送速率信息携带于CTS帧的扰码序列中并反馈给发送端.另外,根据统计的接收误帧率,自适应地调节速率选择的阈值水平,进一步保证了系统性能的稳定性.利用NS-3软件进行了仿真验证,结果表明在不同的信道环境下,该算法的吞吐率性能均优于AARF、ONOE以及Minstrel这3种常用的速率自适应算法.
Rate adaptation, which is one indispensable mechanism for the multi-rate wireless local area network （WLAN）, is critical to the system performance. In this paper, we propose a highly efficient rate adaptation algorithm for IEEE 802. 11ac based on the receiver＇s information feedback without modifying the MAC frame format. The basic idea is that the RTS frame is used to estimate the channel condition accurately, and then the CTS frame is sent back with the information of the chosen rate in a scrambling sequence. Moreover, according to the probability of the error received, the threshold of rate selection can be adaptively adjusted, thus further enhancing the stability of system performance. Simulation and verification by NS-3 show that the throughput performance of this algorithm outperforms that of three well-known rate adaptation solutions （AARF, ONOE, and Minstrel） in different channel environments.
出处
《西安电子科技大学学报》
EI
CAS
CSCD
北大核心
2016年第1期120-126,共7页
Journal of Xidian University
基金
国家科技重大专项资金资助项目(2012ZX03004004)
北京市科技新星计划资助项目(2010B060)
