GPSR: greedy perimeter stateless routing for wireless networks
MobiCom '00 Proceedings of the 6th annual international conference on Mobile computing and networking
A rate-adaptive MAC protocol for multi-Hop wireless networks
Proceedings of the 7th annual international conference on Mobile computing and networking
Coping with communication gray zones in IEEE 802.11b based ad hoc networks
WOWMOM '02 Proceedings of the 5th ACM international workshop on Wireless mobile multimedia
Goodput Analysis and Link Adaptation for IEEE 802.11a Wireless LANs
IEEE Transactions on Mobile Computing
On-Demand Multi Path Distance Vector Routing in Ad Hoc Networks
ICNP '01 Proceedings of the Ninth International Conference on Network Protocols
Exploiting Path Diversity in the Link Layer in Wireless Ad Hoc Networks
WOWMOM '05 Proceedings of the Sixth IEEE International Symposium on World of Wireless Mobile and Multimedia Networks
ExOR: opportunistic multi-hop routing for wireless networks
Proceedings of the 2005 conference on Applications, technologies, architectures, and protocols for computer communications
Efficient rate adaptation with QoS support in wireless networks
Ad Hoc Networks
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Channel-adaptive relaying has recently been proposed as a means to exploit spatial and temporal diversity in multihop ad hoc networks with fading. In conjunction with appropriate routing protocols, adaptive relaying enables each forwarding node in a multihop path to dynamically select the next-hop relay as a function of the measured (time-varying) channel state, providing a form of selection diversity at each hop. Based on the notion that links to diversity-selected relays have higher information capacity and therefore can support higher data rates than links obtained with traditional routing, this paper proposes marrying channel-adaptive relaying with rate adaptation (or adaptive modulation-coding). In particular, we specify a protocol for performing joint rate and relay adaptation in 802.11 ad hoc networks with geographic routing. Using both analytical and simulation tools, synergistic gains are observed in throughput, capacity and delay. Performance results are given for individual links as well as for multihop networks, in time-varying, correlated Rayleigh and Ricean fading channels over a range of channel speeds. Of particular interest in this study is the robustness of the adaptation to increasing channel Doppler. As a by-product of this work, we propose a new, SNR-based rate adaptation scheme for use in 802.11 systems that requires no modification to the standard 802.11 frame structure.