TDD-CDMA系统小区间上下行时隙异步技术  

A Novel Scheme of Asynchronous Time Slots Allocation for TDD-CDMA Systems

作　　者：金小鹿[1] 马猛[1] 焦秉立[1] 

机构地区：[1]北京大学信息科学技术学院先进通信技术研究所,北京100871

出　　处：《北京大学学报（自然科学版）》2009年第6期958-964,共7页Acta Scientiarum Naturalium Universitatis Pekinensis

摘　　要：提出一种可实现TDD-CDMA(时分双工/码分多址)系统小区间时隙异步的技术。首先分析了TDD通信系统实现小区时隙异步存在的困难,重点分析了异步小区之间存在的基站间干扰和移动台间干扰。针对基站间干扰,提出一种利用基站间的有线连接构建自适应射频干扰消除器的方法;针对移动台间干扰,提出一种将小区划分为内外两层,根据用户所处位置进行时隙分配的方法。理论分析和仿真结果均表明,上述方法可以满足小区间异步工作的要求,提高了TDD-CDMA系统动态分配上、下行资源的能力。A novel scheme to enable asynchronous time slots assignment is proposed for TDD-CDMA （time division duplex-code division multiple access） systems, Analysis of inherent inter-eell interference due to asynehrony between adjacent cells is presented first, including BS-BS and MS-MS interference. Then, wired connections between base stations are used to construct the adaptive RF interferences canceller. MS-MS interference is suppressed by time slots allocation to MSs according to their locations. Both theoretical analysis and simulation results show that the inter-cell interference can be decreased to a negligible level and no longer a threat to the system verformance. Therefore, the ability of dynamic resource allocation is imDroved for TDD-CDMA svstems.

关 键 词：时分双工/码分多址 小区间干扰 干扰消除 

分 类 号：TN929.533[电子电信—通信与信息系统]