异构网中宏、微基站间存在频偏时的干扰协调方法  

Interference Coordination with Frequency Offset between Macro and Micro Base Station in Heterogeneous Networks

作　　者：凌为[1] 韩圣千[1] 徐志昆[1] 杨晨阳[1] 

机构地区：[1]北京航空航天大学电子信息工程学院,北京100191

出　　处：《电子与信息学报》2012年第3期670-676,共7页Journal of Electronics & Information Technology

摘　　要：该文考虑骨干网只能进行少量信息交换的多载波异构蜂窝网络,研究微系统进行下行传输时对宏系统的干扰协调问题。针对多载波宏基站和微基站之间存在频偏的场景,在保证对宏用户的干扰小于预定干扰门限的前提下,以最大化微系统数据率为目标,在已知瞬时干扰信道和统计干扰信道信息的条件下分别设计最优和次优发射预编码。分析和仿真的结果表明,次优算法只需迭代一次就能达到接近最优算法的性能,因此具有较低的计算复杂度。所提出的方法只需要在宏基站和微基站之间通过骨干网交换少量信息,具有较低的信息共享资源开销。所提出的方法适用于微基站附近存在多个宏用户的场景。This paper considers multi-carrier heterogeneous cellular networks where only limited information can be shared among Base Stations（BSs） via backhaul links.Considering that there is frequency offset between macro and micro BSs,an optimal precoder and a suboptimal precoder are proposed,aimed at maximizing the date rate of micro systems while ensuring the resulting interference to macro users to be less than an interference threshold,where either instantaneous or statistical interference channel information is known at micro BS.Analysis and simulation results show that the performance of the suboptimal algorithm with only one iteration is close to the performance of the optimal one,and hence it has a lower computational complexity.The proposed method requires only little amount of information to be exchanged between BSs via backhaul links,and thus has a low overhead for sharing information.The proposed method is applicable when there are multiple marco users around the micro BS.

关 键 词：异构网 频偏 干扰协调 低复杂度 

分 类 号：TN92[电子电信—通信与信息系统]