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1、SoUTHEASTUNIVERSITYpERFoR濺AN(j黜ENHANCEA重ENTOFWLANSUSINGSPA’I、IALMULTIPLEXfNGC0醚B王NE獪W￡T董◇FD憋Athesissubmittedtothegraduatessh001ofSoutheas乇7niversi￡：”inpard越f＼tlfiltmentoftherequirements南!thedegreeofM&sterofScience(MSe。1l
2、矬DigitalCommunieatkmsnnin南rnjati蟶SystemsHadeelAdnanAbduLRazaq’oNalioralMobileCommllnlca豫mHResearchLaboratoryDen8rtmotofRadioEngineeringSoutheastUniversJtySeptember2004AbstractThisthesisworkdealswithnewtransmissiontechniq
3、uesfbrhighdatarateWLANs(wirelesslocalareanetworks)Recentstudieshaveshownthatinpresenceel’arichscattering，tileuseofMIMO(multiinpuUmultioutput)systems，thatissystelIRSwithantennaarraysonbothsidesofthewirelesslink，canhugelyh
4、nprovethespectralefficiencyByiTleansefsucharraysandapplyingspatialmultiplexing，thatmeansthattransmissioniscarl’ledoverseveralparalleleharmelscreatedwithasimplepreandpostprocessingitispossibletoreachdataratesmuchhighertha
5、nthosereachedusingclassicaltransmissionsystemsToobtainanevenhigherbitrateandmakethesystemmorerobustagainstInters)mbolInterference，SpatialMultiplexingtechniqueiscombinedwithspectrumefficiencyOrthogonalFrequencyDivisionMul
6、tiplexing(OFDM)Weevaluatetheperfnrmaneeofthistechnique，simulmicnsprovesthatsuchsystemachievesIllOrerobustnessagainstfrequencyselectivefadingWithinsuchsystemswepresentandinvestigatetheper[umnaneeofanewoptimizationLechniqu
7、eallowingmorereliabletransmissionbymeansofadaptivityandsmartpoweralloeaLionThistecb_zt[queaimstheimprovementoftheBERperlbrmancewithoutincreasingthecomplexityofthesystemtoomuchSimulationresultsshowthat23dBisebtailledatBER
8、=001、TheOFDM—basedSpatialMultiplexingsystemissimulatedinMATLABusingtheparametarsofIEEE802—1OFDMstandardforwirelessLANs，ThedelayspreadchannelismodeledbyexponentiallydecayedRayleighfadingByperformingMantaCarlosimulations，B
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