多载波TDD-CDMA系统上行容量研究

针对目前缺乏可靠的多载波时分双工-码分多址(TDD-CDMA:Time Division Duplex-Code Division Multi-ple Access)系统容量评估模型,多载波TDD-CDMA系统网络优化、无线资源管理优化等缺乏理论依据的问题,在理论分析多载波TDD-CDMA系统的上行容量,建立载波间干扰比因子模型的基础上,得出了改进后的多载波TDD-CDMA系统上行容量模型。理论模型表明,多载波TDD-CDMA系统上行容量与小区内外干扰比、多用户检测因子和载波间干扰比因子密切相关。仿真结果表明,上述模型完全正确,采用该模型评估多载波TDD-CDMA系统上行链路容量完全可行,当ACIR(Adjacent Channel Interference Ratio)大于30 dB后,载波间干扰比很小,其对系统容量的影响可以忽略,此时多载波系统总容量与载波数的增加,呈线性关系。

Uplink Capacity of Multi-Carrier TDD-CDMA Systems

Traditional capacity model of single carrier TDD-CDMA(Time Division Duplex-Code Division Multiple Access) is not suitable for multi-carrier system.In this article,uplink capacity of multi-carrier TDD-CDMA system was investigated and inter-carrier interference factor model was established.A new model to determinate the uplink capacity of TDD-CDMA is presented,which shows that multi-carrier TDD-CDMA uplink capacity is close related to inter-to-intra cell interference ratio,multi-user detection and inter-carrier interference factor.Simulation work was done to evaluate the theoretical model and the analysis,a good concordance is observed.Simulation results show that it is feasible to evaluate the uplink capacity of multi-carrier TDD-CDMA system using the model;when ACIR(Adjacent Channel Interference Ratio) is higher than 30 dB,the value of inter-carrier interference factor is very small and its impact on system capacity can be ignored and the capacity of multicarrier system is linear to the deployed carrier number.