TheScheme toImprove thePerformance ofInitial Ranging Symbol Detection withCommonRanging CodeforOFDMA Systems
Jinho Kim, Seong-Chul Kim, Sung‐Joon Cho · 2006
InOrthogonal Frequency Division Multiple Access Timingsynchronization ofuplink isaccomplished byan (OFDMA)systems, timingsynchronization in uplinkis initial uplink synchronization called aninitial ranging process accomplished byaninitial uplink synchronization called an (1)(2). Themaingoalsoftheinitial ranging process atthe initial ranging process. TheBaseStation's receiver synchronizes Base-Station (BS)aretimingestimation andmulti-user thesymboltiming toanyuser's symbolandtheotheruser's symbols havesomeSymbolTiming Offset (STO). Linear phase r odeldte ctin. TheSers' selete ranginodeais shift isoccurred byeachuser's STOinanOFDMA symbol. The modlanted b n PheSitKing (bPSK) dulatio Multiple Access Interference (MAI)caused bythesummation of andtransmitted ontheranging sub-channel during two eachuser's linear phaseshift degrades theperformance Of OFDMA symbol-intervals called aninitial ranging symbol. ranging codedetection. Inthis paper, wepropose aninitial Theinitial ranging symbolarriving attheBS isthe ranging symbol structure withcommonranging codeforphasesuperposition ofthesymbolsfromtheactive usersin shift estimation andcompensation. time-domain. TheBS'sreceiver synchronizes thesymbol timing toanyuser's symbol andtheother user's symbols have