摘要
提出应用于TD＿SCDMA系统的下行链路中的空时扩谱方法.用有限的空时码进行扩谱,并利用较少的发射天线和接收天线进行信号的发射与接收,从而在TD＿SCDMA移动接收端获得最大的扩谱增益.结合TD＿SCDMA的下行链路,分析了在平坦衰落和多径条件下采用空时扩谱的TD＿SCDMA系统的性能.这种结构使下行链路两端的硬件复杂度大大降低,进而解决了现有分集技术不适用于移动终端的问题.同时,仿真结果表明应用于TD＿SCDMA系统的空时扩谱技术能够改善下行链路的性能.
The paper proposes a space_time spreading approach that can be applied in the downlink of TD_SCDMA systems. Base_station uses finite number of space_time codes to spread, and small number of antennas to transmit and receive signal, thus TD_SCDMA mobile terminals can obtain maximal spreading gain. Combining the downlink of TD_CDMA, the paper analyses the performance of TD_SCDMA systems under the conditions of flat fading and multipaths. The approach can reduce the complexity of downlink hardware, and solves the problems of presented spreading technique not suitable for mobile terminals. The simulation shows that the approach can improve the downlink performance of TD_SCDMA systems.
出处
《北方交通大学学报》
CSCD
北大核心
2003年第5期21-25,共5页
Journal of Northern Jiaotong University
基金
国家自然科学基金资助项目(69971002)
