TD集群下行链路小区间干扰特性与抑制策略  

Characteristics and Suppression Strategy of Intercell Interference in TD Trunking Downlink

作　　者：成聿伦[1,2] 杨龙祥[1,2] 

机构地区：[1]南京邮电大学江苏省无线通信重点实验室,江苏南京210003 [2]南京邮电大学宽带无线通信与传感网技术教育部重点实验室,江苏南京210003

出　　处：《南京邮电大学学报（自然科学版）》2012年第3期10-15,共6页Journal of Nanjing University of Posts and Telecommunications：Natural Science Edition

基　　金：国家重点基础研究发展计划(973计划)(2007CB310607);国家高技术研究发展计划(863计划)(2009AA011302);国家科技重大专项(2009ZX03007-004);国家自然科学基金(61071090)资助项目

摘　　要：研究了多小区场景下TD-SCDMA集群系统下行链路的小区间干扰特性,综合大尺度与小尺度模型分析了其对同频同时隙下最大可用码道数的限制以及目标群组位置和邻小区负荷对链路的影响。对各种小区间干扰抑制算法进行了分析与仿真,仿真结果表明小区间干扰形成互相关门限限制了集群系统容量,而MMSE可以用邻小区基站功率更新背景噪声功率的较低代价抑制小区间干扰。This paper studies the characteristics of inter-cell interference （ICI） in downlink of TD trunking system, and analyzes its limit to the max available number of code channels in the same time slot and frequency band. The impacts of group UE＇ s position and loads of neighbor cells are investigated un- der a comprehensive multieell model with both large and small scale fading. Besides, a variety of ICI suppression algorithms are analyzed and compared. Simulation results show that the system capacity is de- teriorated by ICI crosscorrelation threshold, while minimum mean square error （MMSE） detection can e- liminate this influence effectively at low cost by updating background noise with the power levels of neigh- bor cells.

关 键 词：TD-SCDMA 集群 小区间干扰 互相关门限 联合检测 

分 类 号：TN929.52[电子电信—通信与信息系统]