RAS:Rate adaptation in IEEE 802.11 with receiver’s SNR

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

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

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

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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