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|Author(s):||Michael R. Souryal; Nader Moayeri;|
|Title:||Channel-Adaptive Relaying in Mobile Ad Hoc Networks with Fading|
|Published:||October 01, 2005|
|Abstract:||This paper describes an approach for relaying in multihop networks that adapts to the time-varying channel and exploits spatial diversity to mitigate multipath fading. Ignored in some simulation-based performance analyses, fading arises from multipath propagation and causes fluctuations in the signal strength in mobile networks, adversely affecting communication performance. Our approach uses limited cross-layer interactions between the physical, link and routing layers to provide adaptivity to both large and small-scale channel effects and to achieve spatial diversity gain without the use of multiple antennas. The routing layer uses long-term measurements of link quality in the form of the average signal-to-noise ratio (SNR) to opportunistically select next-hop relays on a hop-by-hop basis. Small-scale variations are overcome at the MAC layer through efficient multicast polling of multiple next-hop candidate relays prior to data transmission. A performance analysis for networks employing geographic routing and an IEEE 802.11-based MAC (i) demonstrates significant improvements in network capacity and end-to-end delay achieved with these channel-adaptive techniques in Rayleigh and Ricean fading environments, (ii) shows that most of the small-scale diversity gain is obtained through the use of only two next-hop relay choices, and (iii) assesses the practical limit of the short-term adaptive component in terms of maximum node velocity.|
|Conference:||IEEE Conference on Sensor and Ad Hoc Communications and Networks|
|Proceedings:||Proceedings of the IEEE Conference on Sensor and Ad Hoc Communications and Networks (SECON)|
|Dates:||September 26-29, 2005|
|Keywords:||ad hoc network,adaptive routing,cross-layer,fading,IEEE 802.11|
|Research Areas:||Wireless, Networking|
|PDF version:||Click here to retrieve PDF version of paper (271KB)|