PDF-IEEETRANSACTIONSONINFORMATIONTHEORY,VOL.47,NO.2,FEBRUARY2001EfficientE

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regularLDPCcodeforexamplethecomplexityofencodingisessentiallyquadraticintheblocklengthHoweverwe 100000isstillquitepracticalMoreimportantlywewillshowthat147optimized148codesactuallyadmitli

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IEEETRANSACTIONSONINFORMATIONTHEORY,VOL.47,NO.2,FEBRUARY2001EfficientE: Transcript

regularLDPCcodeforexamplethecomplexityofencodingisessentiallyquadraticintheblocklengthHoweverwe 100000isstillquitepracticalMoreimportantlywewillshowthat147optimized148codesactuallyadmitli. Fig.1.Sensornodesdeployedtomeasureambienttemperature.sensornetworks,thecomputationalpowerandenergyresourcesmaybeverylimited.Theseconstraintsmotivatethedesignofsimpledecentralizedalgorithmsforcomputati loglog log(5)istheshiftoperator,(,foreach.Theactionofonthefunctionisgivenby):=denotesshift-invariantprobabilitymeasures.Forwede (thetotalnumberofusers)andlength .Wepresentbinaryfingerprintingcodessecureagainstsize- tionswhichenablethedistributor(decoder)torecoveratleastoneoftheusersfromthecoalitionwithprobabilityoferrorexp( fo D.N.Ku,S.Glagov,J.E.MoorewPAbdominalAortaExperimencularSur,Vol.9,No.2,pp.309-315(1989).(1989).M.Lei,C.KleinstreuerandJ.P.Archie,\Hemo-dynamicSimulationsand,Vol.119,pp.343-348(1997).(1997).D.P.Giddens, ,oneoffsetfromtheotherbyhalfastepsize.Thefirstquantizerindexissentonthefirstchannelandthesecondquantizerindexissentonthesecondchannel.Ifbothchannelswork,thedecoder whereasifonlyasinglechannelworks,the ontheminimumdistance.Forthesecodes,asoft-decision,reliability-based,linear-timedecodingalgorithmisintroduced,thatcorrectsanyfractionoferrorsuptoalmost .Forthebinary-symmetricchannel,thisalgorithm VOL. XXXIV—NO. 2 2013 VOL. XXXIV—NO. 2 2013 VOL. XXXIV—NO. 2 2013 VOL. XXXIV—NO. 2 2013 LETTERS CONSCIENCE VOL. XXXIV—NO. 2 2013 LETTERS CONSCIENCE VOL. XXXIV—NO. 2 Fig.1.Two-userGaussianinterferencechannel.basicinformationtheorymodeltostudythisquestionisthetwo-userGaussianinterferencechannel,wheretwopoint-to-point Authorized licensed use limited to: Hewlett-Pack =min( transmitantennas,where isthenumberofreceiveantennasand isthelengthofthecoherenceinterval,whereasatlowSNR,themutualinformationismaximizedbyallocatingalltransmitpowertoasingleantenna.IndexTerms (1)where isaknownmatrixwithunit-normcolumns, asparsecoef ,user ndsthetwocodewordscorrespondingtocomponents andalsouniformlychoosesacodeword from .User thenaddsallthesecodewordsandtransmitstheresultingcodeword ,sothatitactuallytransmitsoneof codewords.Let No IEEETRANSACTIONSONINFORMATIONTHEORY,VOL.48,NO.6,JUNE2002formabasisforscheduling.Thechanneltrackingisdoneviaasinglepilotsignalwhichisrepeatedatthedifferenttransmitantennas,justlikethedata.Ifthemagnitud InterestsIambroadlyinterestedinTheoreticalComputerScienceandspeci28callyinCodingTheoryPseudo-randomnessComplexityTheoryandAdditiveCombinatoricsWork2018-2020PostdoctoralResearcherTheorygroupMicrosoftRe Vol.6(2009)1{33ISSN:1549-5787DOI: 10.1214/08-PS141 Asurveyofresultsfordeletionchannelsandrelatedsynchronizationchannels MichaelMitzenmacher y HarvardUniversity,SchoolofEngineeringandAppliedSciencese

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