简介：Thesingle-carrierblocktransmission(SCBT),a.k.a.,single-carrierfrequency-domainequalization(SC-FDE),isbeingconsideredasanoptiontechniqueforthewirelesspersonalareanetwork(WPAN)operatingat60GHz.Itisfoundthatforresidentialenvironment,innon-line-of-sight(NLOS)multi-pathchannels,theSCBTismuchmoreeffectivetocombattheinter-symbolinterference(ISI)comparedwithorthogonalfrequencydivisionmultiplexing(OFDM).Low-densityparity-check(LDPC)codesareaclassoflinearblockcodeswhichprovidenearcapacityperformanceonalargecollectionofdatatransmissionandstoragechannelswhilesimultaneouslyadmittingimplementabledecoders.TofacilitateusingLDPCcodesforSCBTsystem,anewlog-likelihoodratio(LLR)calculationmethodisproposedbasedonpilotsymbols(PS).GolaySequenceswhosesumautocorrelationhasauniquepeakandzerosidelobeareusedforcreatingthePS.ThepositionandlengthofthePSarenotfixedinthedatablocks.ThesimulationresultsshowthattheproposedmethodcansignificantlyimprovetheLDPCdecodingperformanceinSCBTsystem.Thisisverypromisingtosupportultrahigh-data-ratewirelesstransmission.

简介：NetworkCoding(NC)bringscorrelationbetweenthecodedsignalsfromdifferentsources,whichmakesthesystemmorevulnerabletothedecodeerroratrelay.ConventionalCyclicRedundancyCode(CRC)hasbeenimplementedforerrorbitdetection.However,itserrorcorrectionissimplyignored.Tofullyexploitthisfeature,thispaperproposesanoveljointLog-LikelihoodRatio(LLR)CRCerrormitigationforNCtwowayrelaychannel.SpecificthresholdsaredesignedtoestimatetheerrornumberofdatablockandidentifythosewhichcanberecoveredifthenumberiswithintheerrorcorrectionscopeofCRC.Weexaminetwomodesofthethresholds,onebasedontheaverageBitErrorRate(BER)ofsource-relaylink,whiletheotherbasedonthatofinstantaneousone.WeprovidethefullanalysisforthePair-wiseErrorProbability(PEP)performanceofthescheme.AvarietyofnumericalresultsarepresentedtorevealthesuperiorityoftheproposedschemetoconventionalCRCNCunderindependentRayleighfadingchannels.Moreover,theefficienciesoftheproposedthresholdsarealsovalidated.

简介：<正>瑞典国王之路位于瑞典拉普兰山区,有世间最洁净的空气、植被、冰川水系与风景。一直以来都是FjllrvenClassic110公里经典穿越活动的线路。而2014年恰逢FjllrvenClassic110公里经典穿越活动十周年,来自中欧EMBA商学院的户外爱好者及部分媒体组成了20人的中国团队也参与到其中。