具有双层系统的分扇区CDMA小区上行链路容量

码分多址系统与传统的时分多址和频分多址系统相比,在各方面都具有优势,尤其是能提供更好的服务质量和更大容量,因而成为第三代移动通信系统的核心技术。通过在小区中划分扇区能进一步提升系统容量,在扇区中又引入双层系统,可以显著提高该扇区内容量。由于CDMA系统是噪声受限系统,因此以信干比为标准,分析具有双层系统的分扇区CDMA小区系统的上行链路容量。最后通过仿真结果证明了该系统上行链路容量相对普通小区系统上行链路容量的提升。

Uplink Capacity of a Sectorized CDMA Cell with a Hot-Spot Two-tier System

Comparing to the traditional TDMA and FDMA systems,the Code Division Multiple Access(CDMA) system has the advantages over different aspects,especially in providing high quality of service and high capacity.Therefore,CDMA has become the core technology in the third generation mobile system.By sectorizing a cell,the system capacity can be further improved,and introducing a hot-spot two-tier system into a sector can obviously improve the capacity of the sector.Since the CDMA system is noise-limited,analysis is carried out,based on Signal-to-Interference Ratio(SIR) criteria,about the uplink capacity of a sectorized CDMA cell with a hot-spot in one sector.Finally,simulation results demonstrate an uplink capacity improvement comparing to the common systems.