一种基于动态功率分配的干扰对齐优化方法  

An Optimized Interference Alignment Algorithm Based on Dynamic Power Allocation

作　　者：张翠平[1] 刘允[1] 

机构地区：[1]中国电子科技集团公司第五十四研究所,北京100070

出　　处：《无线电通信技术》2017年第4期35-39,共5页Radio Communications Technology

基　　金：国家高技术研究发展计划(863计划)项目(2014AA01A707)

摘　　要：干扰对齐是解决无线通信系统中同频干扰的有效手段,显著地提高了多小区MIMO系统的容量。为了解决常规干扰对齐算法只在空间域上对齐的不足,提出一种联合功率分配的干扰对齐优化方案。基于信道矩阵的弦距离计算和优化干扰对齐方案的预编码矩阵;然后在用户的各个数据流之间进行动态功率分配,使干扰进一步减小。仿真结果表明,相比已有的预编码矩阵设计方案,系统容量有明显的改进,降低了系统误码率,具有良好的工程适用性。Interference alignment（ IA） is one of the promising technologies to solve the co-channel interference in wireless communication systems. It can effectively improve system capacity and reliability. Based on a consideration of engineering applications,the realization of interference alignment for three-cell multiple-input multiple-output（ MIMO） cooperative communication system is studied,and then a joint IA and power allocation algorithm is proposed,which is designed to decrease the effect of the interference from unwanted transmitters with less computational cost. Firstly,the pre-coding matrix and interference mitigation matrix are designed and optimized based on the decomposition of channel and the chord distance of matrix. Secondly,the power is allocated dynamically among different data streams of users to further reduce the interference. The simulation results show that,as compared with the existing interference alignment design schemes,the system throughput realized by the optimized algorithm is significantly improved.Furthermore,the optimized algorithm also has advantages in bit error rate,and has better engineering applicability than other algorithms.

关 键 词：干扰对齐 多输入多输出 预编码 功率分配 

分 类 号：TN929.5[电子电信—通信与信息系统]