正交投影的下行多用户MIMO协作传输方法  

Coordinated multi-point transmission method for downlink multi-user MIMO based on orthogonal projection

作　　者：胡海飞[1] 景小荣[1] 

机构地区：[1]重庆邮电大学移动通信技术重点实验室,重庆400065

出　　处：《重庆邮电大学学报（自然科学版）》2014年第2期195-200,共6页Journal of Chongqing University of Posts and Telecommunications(Natural Science Edition)

基　　金：国家科技重大专项(2014ZX03001009-003)~~

摘　　要：协作多点(coordinated multi-point,CoMP)中的联合传输(joint transmission,JT)是一种有效提升边缘用户服务质量的技术,JT通过多个协作发射节点的联合预编码减小小区边缘干扰,进而提高小区边缘的频谱效率。在结合正交投影(orthogonal projection,OP)与排序QR分解(sorted QR-decomposition,SQRD)的基础上,提出了2种协作传输方法:OP-ZF-SQRD(OP-zero forcing-SQRD)及OP-MMSE-SQRD(OP-minimum mean square error-SQRD)。这2种方法均采用OP消除多用户干扰,将多用户系统分解成多个并行无干扰的单用户系统,对每个单用户系统采用ZFSQRD或MMSE-SQRD分别进行处理。数值仿真结果表明,这2种方法相比迫零(joint transmitter zero forcing,JTZF)及块对角化(block diagonalization,BD)方法,在性能上具有明显的优势;新提出的协作传输方法不但可有效地消除多用户干扰,而且能有效地降低用户数据流之间的干扰,从而有效地改善了小区边缘的用户服务质量和频谱效率。Coordinated multi-point （CoMP） joint transmission （JT） is an effective technique to improve the quality of serv-ices for cell edge user. In JT, multiple points precode jointly to reduce the interference of the cell edge, thereby improve the spectral efficiency. Combining orthogonal projection （OP） with sorted QR decomposition （ SQRD）, the paper proposes two JT methods which are respectively named as OP-ZF-SQRD and OP-MMSE-SQRD. Both methods use OP to eliminate multi-user interference, and decompose the muhi-user system into multiple parallel single-user systems without interfer-ence. Then, ZF-SQRD or MMSE-SQRD is applied to each single-user system separately. Simulation results show that com-pared to joint transmitter zero forcing （JT-ZF） and block diagonalization （BD） methods, the two proposed methods have obvious advantages in performance. Meanwhile, the two proposed methods can not only eliminate multi-user interference but also mitigate multi-stream interference of each user effectively, thereby they improve the quality of services and the spectral efficiency for the cell edge.

关 键 词：协作多点(CoMP) 联合传输(JT) 预编码 多用户 正交投影(OP) 排序QR分解(SQRD) 

分 类 号：TN929[电子电信—通信与信息系统]