基于最小化系统功率的多小区蜂窝中继波束成形研究  

Collaborative relay beamforming based on minimum power in multicell systems

作　　者：王达[1] 张晓宁[1] 吕国成[1] 吴佟 吴建军[1] 金野[1] 项海格[1] 

机构地区：[1]北京大学信息科学技术学院区域光纤通信网与新型光通信系统国家重点实验室,北京100871 [2]总参通信部驻七一四厂军代室,南京210002

出　　处：《重庆邮电大学学报（自然科学版）》2012年第5期610-614,638,共6页Journal of Chongqing University of Posts and Telecommunications(Natural Science Edition)

摘　　要：为了减少小区间干扰给用户通信带来的不利影响,研究了多小区通信系统协作传输技术。提出了一种联合优化多小区基站和中继波束成形权重的迭代优化策略,在用户信干噪比限制下达到了最小化系统总功率的目标。利用半正定放松技术把上述优化问题转化为半正定规划问题,从而通过内点法得到最优解。仿真结果表明,提出的多小区基站和中继波束成形权重的迭代优化策略只需要有限的几次迭代就可达到最优的性能,并给出了在性能与基站天线和中继数目之间的折中,从而利用最少的系统资源,达到降低相邻小区用户干扰,保证用户的正常通信质量的目标。This paper studies the coordinated multicell downlink transmission to cope with the severe inter-cell interference in future cellular systems.We propose an iterative scheme to jointly optimize the base station（BS）and relay beamforming weights to minimize the BS and relay power to guarantee the received signal-to-interference-and noise ratio（SINR）with perfect channel state information（CSI）.Using the semidefinite relaxation（SDR）technology,the optimization problems for BS and relay beamforming weights can be converted into semidefinite programming（SDP）problems,which can be effectively solved by interiorpoint methods.Simulation results demonstrate that the proposed iterative scheme can achieve near-optimal performance within a few iterations and provide a good tradeoff between performance and cost（i.e.,the number of BS antennas and relays）in the multicell systems.

关 键 词：多小区 中继 联合优化 波束成形 

分 类 号：TN911[电子电信—通信与信息系统]