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dc.contributor.advisorRobert Morris.en_US
dc.contributor.authorBiswas, Sanjit Zubinen_US
dc.contributor.otherMassachusetts Institute of Technology. Dept. of Electrical Engineering and Computer Science.en_US
dc.date.accessioned2006-09-28T15:04:39Z
dc.date.available2006-09-28T15:04:39Z
dc.date.copyright2005en_US
dc.date.issued2005en_US
dc.identifier.urihttp://hdl.handle.net/1721.1/34115
dc.descriptionThesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2005.en_US
dc.descriptionIncludes bibliographical references (leaves 45-47).en_US
dc.description.abstractThis thesis describes ExOR, an integrated routing and MAC protocol for bulk transfers in multi-hop wireless networks. ExOR exploits the broadcast nature of radios by making forwarding decisions based on which nodes receive each transmission. The spatial diversity among receivers provides each transmission multiple opportunities to make progress in the face of packet losses. As a result ExOR can use long links with high loss rates, which would be avoided by unicast routing. ExOR operates on batches of packets. The source node includes a list of candidate forwarders in each packet, prioritized by closeness to the destination. Receiving nodes buffer successfully received packets and await the end of the batch. The highest priority forwarder then broadcasts the packets in its buffer, including its copy of the "batch map" in each packet. The batch map contains the sender's best guess of the highest priority node to have received each packet. The remaining forwarders then transmit in order, sending only packets which were not acknowledged in the batch maps of higher priority nodes. The forwarders continue to cycle through the priority list until the destination has enough packets to recover the original data using forward error correction.en_US
dc.description.abstract(cont.) An evaluation of an implementation on a 38-node 802.11b test-bed shows that ExOR improves bulk data transfer throughput for most node pairs when compared with unicast routing. For pairs between which unicast uses one or two hops, ExOR's robust batch maps prevent unnecessary retransmissions, increasing throughput by nearly 50%. For longer unicast routes, ExOR takes advantage of spatial diversity, providing gains of a factor of two to four when using a batch size of 10 packets.en_US
dc.description.statementofresponsibilityby Sanjit Zubin Biswas.en_US
dc.format.extent47 leavesen_US
dc.format.extent2561808 bytes
dc.format.extent2563669 bytes
dc.format.mimetypeapplication/pdf
dc.format.mimetypeapplication/pdf
dc.language.isoengen_US
dc.publisherMassachusetts Institute of Technologyen_US
dc.rightsM.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission.en_US
dc.rights.urihttp://dspace.mit.edu/handle/1721.1/7582
dc.subjectElectrical Engineering and Computer Science.en_US
dc.titleOpportunistic routing in multi-hop wireless networksen_US
dc.typeThesisen_US
dc.description.degreeS.M.en_US
dc.contributor.departmentMassachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
dc.identifier.oclc67618057en_US


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