认知中继网络干扰约束下的最优波束形成设计  

Optimal Beam forming Design in Cognitive Relay Networks Under Interference Threshold

作　　者：刘梓君 高瞻[2] 杨昆[3] 于瑶[4] 魏士博[5] LIU Zi-jun;GAO Zhan;YANG Kun;YU Yao;WEJ Shi-bo(Postgraduate Team 2 CCE,PLAUST,Nanjing 210007,China;College of Communications Engineering,PLAUST;Unit 77108 of PLA,Chengdu 610000,China;Unit 61755 of PLA,Beijing 100851,China;Training Department,PLAUST)

机构地区：[1]解放军理工大学通信工程学院研究生2队,江苏南京210007 [2]解放军理工大学通信工程学院 [3]中国人民解放军77108部队,四川成都610000 [4]中国人民解放军61755部队,北京100851 [5]解放军理工大学训练部

出　　处：《军事通信技术》2013年第4期12-15,69,共5页Journal of Military Communications Technology

摘　　要：近年来,出现了一种新型的认知无线网络模型,其方法是利用主用户当前通信频段,认知用户通过中继主用户数据传输,获得自身数据传输的机会。传统的分时隙中继方法效率较低,文章基于多输入多输出(MIMO)技术,给出一种新的认知中继网络模型,实现了中继数据和自身数据的同时传输,提高了效率。在主用户干扰约束条件下,提出了最优波束形成算法,在理论上推导了最优权值矩阵,获得了认知用户的最大信干噪比,并通过仿真进行了验证。A new model for cognitive radio networks appears in which a Secondary User(SU)can relay the primary data stream and improve the performance of the primary user's com-munication.The SU can transmit its own data in return for the cooperation.Traditionally,the transmitter of the secondary users sends data to the cognitive user and relays the data sent from the primary user in different time slots.However,Multiple Input Multiple Output(MIMO)pro-vides a remarkable increase in the spectral efficiency,which can transmit multiple independent data streams in a time slot with MIMO antenna.Based on the MIMO technique,a novel frame-work was proposed,in which the cognitive user near by the primary user is equipped with MIMO antenna.The cognitive user offers its help to transmit the primary user's data and shares the spectrum to send data to the cognitive receiver in the same time,as long as it can ensure the Quality-of-Service(QoS)of the PUs.In this paper,the maximum sum-rate of the cognitive user was searched for,limiting the interference to the primary user.Simulation results show that the proposed method can really improve the performance of the cognitive relay networks.

关 键 词：认知无线网络 多输入多输出 中继节点 干扰约束 

分 类 号：TN828.6[电子电信—信息与通信工程]