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1、LATTICEDECODINGFORSPACE-TIMECODESWITHNEWAPPROACH112K.Dolatyar,L.BeygiH.,A.Olfat1ZaeimElectronicIndustries,No.21,ZaeimBldg.,NilooSt.,VanakSq.,Tehran,14356-Iran,k_dolatyar@yahoo.com2DepartmentofElectrical&ComputerEngineering,UniversityofTehran,Tehran,Iran,aolfat@yahoo.co
2、mAbstract-InthispaperweintroduceanewalgorithmforTheyrefertothesecodessimplyasLDcodes(Lineardecodingofspace-timecodesinawirelesssystemwithanDispersioncodes).Thesecodessubsumeblockcodesof[3].arbitrarynumbertransmitandreceiveantennas.ThisalgorithmOnewaytodecodethesecodesi
3、noptimalperformanceisbenefitsfromlatticestructureofspace-timecodes,andthespheredecoding(SD)[7].Inthispaperweproposeanewalgorithmreachesmaximum-likelihoodperformancewhileitalgorithmfordecodingofthisspace-timecodesbasedonlatticeshowsmuchlowercomplexity.Thesimulationresul
4、tsofthisstructureofthem.ThisalgorithmreachesMLperformancewithalgorithmarepresented.muchlowercomplexity.InthefollowingwedescribethesystemmodelthenwegothroughthewaythatleadsustotheKeywords–SpaceTimeCoding,LatticeDecoding,Linearideaofnewalgorithm.Simulationresultsofperfor
5、manceareDispersionCodes.presented.1.INTRODUCTION2.SYSTEMMODELOnewaytogethighratesonascattering-richwirelessIn[7]theauthorsconsiderthesystemmodelasfollowschannelistousemultipletransmitandreceiveantennas.x=sH+v(1)Recently,thefieldofmulti-antennaprocessingandspace-timewhe
6、reHisarealmmxnmatrixofrankr=min(m,n),u∈Z/,and(ST)codinghasattractedlargeinterestinthecommunicationnT]=2v∈ℜisaGaussiannoisewithE[vvσI.Wheneverwencommunityduetothehugecapacityofthemulti-antennaareinthepresenceofdeepfadesthenSDwillbecomeveryenvironment[1].Onesuchapproachi
7、sVBLAST(VerticalBellslowbecauseoffallingmanypointsinsidethesearchsphere.LabsLayeredSpace-Timecodes)[2],whichbreakstheoriginalTheideaofLDcodesmakesthedecodingofspace-timeblockdatastreamsintosubstreamsthataretransmittedonthecodesasaprobleminlatticedecodingforanarbitraryn
8、umberindividualantennas.Becauseofthemaximum-likelihood(ML)transmitandreceiveantennas.ThisideaisdepictedinFig.1.detect
