一种基于接收端SNR的IEEE 802.11WLAN速率自适应算法

J4 ›› 2013, Vol. 35 ›› Issue (12): 45-51.

邓晓衡1，李旭1，刘强1，陈志刚2

DENG Xiaoheng1,LI Xu1,LIU Qiang1,CHEN Zhigang2

(1.Department of Information and Communication Engineering,Central South University,Changsha 410083;
2.School of Software,Central South University,Changsha 410075,China)

Received:2013-08-05 Revised:2013-10-21 Online:2013-12-25 Published:2013-12-25

摘要：

速率自适应调整对于提高IEEE 802.11物理层传输性能具有重要意义，现有许多算法对于碰撞所带

来的性能影响没有充分考虑，通过区分信道错误和链路层碰撞，进而依据测量的接收端SNR信息实现速率

调整，通过ACK帧捎带速率调整信息给发送端。接收端SNR能反映信道状况，避免碰撞带来不必要的速率下

降。仿真实验结果表明，提出的速率自适应算法RAS能避免碰撞对速率调整的影响，在多节点争用信道的

情况下有较高的吞吐量和较低的延迟。

关键词: 速率自适应, IEEE 802.11, 信号与噪声比

Abstract:

Rate Adaptation

(RA) is designed to improve the performance of multirate feature in IEEE 802.11 PHY. One

of the key issues in RA is to differentiate the channel error from linklayer collision,

which is overlooked by many RA algorithms. Other than some RA algorithms that identify

collisions at the transmitter by chances, we use receiver’s SNR to reflect the channel

condition and mitigate the effect of collisions. A RA algorithm that utilizes ACK feedback

mechanism is proposed to inform transmitter of receiver’s SNR so as to adaptively select

the transmission rate. Simulation results show that our proposal mitigates the effect of

collisions and performs well in respect of throughput and delay.

Key words: rate adaptation;IEEE 802.11;signaltonoise ratio

邓晓衡1，李旭1，刘强1，陈志刚2. 一种基于接收端SNR的IEEE 802.11WLAN速率自适应算法[J]. J4, 2013, 35(12): 45-51.

DENG Xiaoheng1,LI Xu1,LIU Qiang1,CHEN Zhigang2. RAS:Rate adaptation in IEEE 802.11 with receiver’s SNR [J]. J4, 2013, 35(12): 45-51.

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