频率选择性信道中的多用户分布式波束形成技术  

Distributed Multiuser Beamforming for Relay Networks in Frequency-selective Channels

作　　者：张立[1] 陈海华[1] 何明[1] 孙桂玲[1] 

机构地区：[1]南开大学电子信息与光学工程学院,天津300071

出　　处：《电子与信息学报》2015年第11期2664-2671,共8页Journal of Electronics & Information Technology

基　　金：国家自然科学基金(61171140)~~

摘　　要：该文研究频率选择性信道中多用户点对点分布式中继网络波束形成技术。为了均衡源节点与中继节点以及中继节点与目标节点之间的频率选择性信道,该文提出的波束形成技术在中继节点上采用有限长响应滤波器和滤波而后转发的中继数据传输方法,以最小化中继节点的发射总功率为目标,同时满足所有目标节点的服务质量(Qo S)。该波束形成优化问题的直接形式由于其非凸性而难以求得最优解。该文采用半定松弛(SDP)方法将其近似为凸优化问题,进而可以用内点法高效快速求解。仿真结果表明,相较于传统的放大而后转发的波束形成技术,所提波束形成方法能有效提高频率选择性信道中多用户中继网络的性能。In this paper, a distributed peer-to-peer beamforming technique in frequency-selective relay networks is proposed. It is assumed that all the relay nodes use Filter-and-Forward （FF） protocol to compensate for the source-to-relay and relay-to-destination channels. All the channels of the active source-destination pairs are considered to be frequency-selective. The beamforming strategy that minimizes the total relay transmitted power subject to the Quality-of-Service （QoS） constraints for all of the destination nodes is considered. The resultant problem is approximately solved using Semi-Definite Programming （SDP）. Simulation results demonstrate that in frequency-selective multiuser relay networks, the proposed technique substantially outperforms the existing amplify-and-forward peer-to-peer beamforming methods.

关 键 词：分布式波束形成 滤波转发 频率选择性中继网络 

分 类 号：TN92[电子电信—通信与信息系统]