| A Two-Level Spreading-despreading CDMA System and Its Performance Evaluation |
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| 作者姓名： | HAO Li FAN Ping zhi |
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| 作者单位： | Institute of Mobile Communications，Southwest Jiaotong University，Chengdu，610031，P.R. China |
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| 基金项目： | ThisworkwassupportedbytheNationalScienceFoundationofChina(NSFC)underthegrant(No.6982 51 02and69931050),andtheMillenniumProjectofMEXT ,Japan. |
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| 摘 要： | 1 IntroductionHowtosuppresstheinterferenceintheCDMAsystems,includingtheSelfInterference(SI) ,Mul tipleAccessInterference(MAI)andtheAdjacentCellInterference(ACI) ,isthekeypointinimprov ingthesystemperformanceandcapacity .Insteadofthecomplicatedspecializedsignalprocessingtech niquesusedbefore1～ 4] ,spreadingsequenceswithgoodcorrelationpropertiescanimprovethesystemperformanceradically5] .InRef.6～ 9],theconceptofZeroCorrelationZone (ZCZ) ,whichisequivalenttothegeneralizedothogonal…
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A Two-Level Spreading-despreading CDMA System and Its Performance Evaluation |
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| HAO Li,FAN Ping zhi.A Two-Level Spreading-despreading CDMA System and Its Performance Evaluation[J].The Journal of China Universities of Posts and Telecommunications,2003,10(2). |
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| Authors: | HAO Li FAN Ping-zhi |
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| Abstract: | A new two level spreading despreading scheme is presented in this paper. By adopting the two level scheme, the Generalized Orthogonal (GO) zone of GO codes can be utilized. In this paper, the forward link of a multi cell CDMA system employing the two level scheme is presented and analyzed. The BER performance obtained by Gaussian Approximation is compared with that of the conventional single level spreading despreading system. The results reveal that the two? level CDMA system introduced in this paper exhibits larger performance gain when time delay can be restricted within a given zone. |
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| Keywords: | CDMA GO codes spreading scheme |
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