Seyed Javad Kazemitabar - Coping with Interference in Wireless Networks

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1、SIGNALSANDCOMMUNICATIONTECHNOLOGYForothertitlespublishedinthisseries,gotowww.springer.com/series/4748SeyedJavadKazemitabarCopingwithInterferenceinWirelessNetworksSeyedJavadKazemitabarDept.ofEEandCSUniversityofCaliforniaIrvineIrvine,CA92697-2700USAkazemita@hotmail

2、.comISSN1860-4862ISBN978-90-481-9989-1e-ISBN978-90-481-9990-7DOI10.1007/978-90-481-9990-7SpringerDordrechtHeidelbergLondonNewYork©SpringerScience+BusinessMediaB.V.2011Nopartofthisworkmaybereproduced,storedinaretrievalsystem,ortransmittedinanyformorbyanymeans,elec

3、tronic,mechanical,photocopying,microfilming,recordingorotherwise,withoutwrittenpermissionfromthePublisher,withtheexceptionofanymaterialsuppliedspecificallyforthepurposeofbeingenteredandexecutedonacomputersystem,forexclusiveusebythepurchaserofthework.Coverdesign:VTE

4、X,VilniusPrintedonacid-freepaperSpringerispartofSpringerScience+BusinessMedia(www.springer.com)TomyparentsPrefaceInthisbookwestudytheeffectofinterferenceandmethodsofcopingwithitinawirelessnetwork.Weapproachtheproblemfromthreedifferentperspectives.Thefirstwhichinvo

5、lvesphysicallayerisamethodtocanceloutinterferenceinamulti-accesschannel.WeconsiderJtransmitterunitseachequippedwithNtransmitan-tennasoverwirelessRayleighfadingchannels.Previously,itwasprovedthatwheneachtransmitterunithasNtransmitantennas,using(J−1)N+rreceiveanten

6、-nasforanyr≥1,thereceivercancompletelyseparatethesignalsofJusers.TheprovideddiversitytoeachuserwasshowntobeNriftheunitsemployspace-timetrelliscodeseveniftheunitstransmitasynchronously.Here,weconsiderthecasewhenallunitsaresynchronizedandemployQuasi-OrthogonalSpace

7、-TimeBlockCodes(N>2).ItisprovedthatinthiscaseareceiverwithJ+r−1antennas,withr≥1,canseparatethetransmittedsignalsofallunitsandprovideeachunitwithadiversityorderofNr.Basedonourinterferencecancellationtechnique,wethenofferanarrayprocess-ingschemewhichprovidestrade-o

8、ffbetweendiversityandspatialmultiplexing.Itisshownviasimulationsthatthisarrayprocessingschemeperformsbetterthanwell-knownmodulationschemes,e.g.space-timeblockc