TDSCDMA系统联合检测技术的研究及实现(3)
发布时间:2021-06-07
发布时间:2021-06-07
TDSCDMA系统联合检测技术的研究及实现
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ABSTRACT
TD—SCDMA,whichcombines
withCDMA.isonealltheadvantageofthetimedivisiondeplex(TDD)ofthethreemainstandardsofthird-generationmobileradiosystem.
useFurthermore,itmakesofmanyadvancedtechniques,suchassmartantenna,joint
detection(JD),andsoon.So,TD—SCDMAisthemostefficientinusingthespectruminthethreemainstandards.
Joint
onDetectionisoneofthekeytechniquesinTD—SCDMAsystem.anditisbasedcanmulti-userdetection.Jointdetectionreduceoreliminatethemultiaccessinterference(MAO,intersymbolinterference(IsoandNear-Fareffects,simplifypowercontrol,reducepowercontrolprecision,andremedythenegativeinfluencecausedbythe
code.Consequently,jointdetectionnonidealrelativityoftheorthogonalspreading
techniquecallimprovethesystemperformance,increasethesystemcapacity,andextendthecellcoverage.
ThecharacterofthephysicallayerproceduresforTD—SCDMAsystemisintroducedandthenChapter2explainsthejoint—detectionmodelfortheuplinkofTD SCDMAsystem.Astydyhas
Chapterbeenmadeonthethreekindsoflinearjointdetectionalgorithmsin3.Thentheperformanceandcomplexityofthethreealgorithmshasbeen
redioanalyzed.InTD—SCDMAmobile
leastsquaresproblemwithasystem.joint-detectionisequivalenttosolingablock-Toeplitzsystemmatrix.Byextendingthismatrixtoa
matrix研mFastFourierblock-circulantmatrix.itispossibletoblockdiagonalizethe
lastofChapterTransforms(FFT).Inthe3,Simulationresultsandcomputational
requirementfigures
Chapter4forjointdetectionalgofithnmusingFFTispresented.thetoolsintroducesusinginthehardware
joint-detectionalgorithm.AndthenthesignalprocessingimplementationofschemeforTD—SCDMAsystemisbennpresented.Thenthedetailofeverymoduleforjoint-detectionalgorithmisbeendescribed.
Chpater5focusonthetestingplat-formforjoint-detoctionASICdesigning.ThedataexchangeinterfacebetweenDSPandFPGAisdescribedindetail.
algorithm;ASICKeywords:TD SCDMA;jointdetection;block-fourier
III
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