多用户MIMO网络的OFDM放大转发双向中继策略  

OFDM Amplify-and-Forward Two-Way Relaying for Multiuser MIMO Networks

作　　者：赵睿[1,2] 邹应全[1] 李春国[1] 杨绿溪[1] 

机构地区：[1]东南大学信息科学与工程学院,南京210096 [2]华侨大学信息科学与工程学院,泉州362021

出　　处：《电子与信息学报》2010年第3期617-622,共6页Journal of Electronics & Information Technology

基　　金：国家973计划项目(2007CB310603);国家自然科学基金(60672093;60496310);国家863计划项目(2007AA01Z262);江苏省自然科学基金(BK2005061)资助课题

摘　　要：在多用户MIMO通信网络中,该文提出一种新的放大转发双向中继策略,在第1时隙的多址传输中采用OFDMA,在第2时隙的广播传输中采用OFDM/SDMA,通过利用频率分集和空间分集提高了系统性能。针对双向中继传输的特点,采用两种方法在每个子载波上设计了中继波束形成矩阵,即信漏噪比(SLNR)准则和块对角化迫零(BDZF)准则。利用割集理论推导了该双向中继网络的容量域上界。仿真结论表明,所提出的双向中继策略在系统和速率性能上优于其他3种中继策略,并能逼近所推导的容量域上界。In multiuser MIMO communication networks,a new amplify-and-forward two-way relaying scheme is proposed employing OFDMA for the multiple access transmission in the first time slot and OFDM/SDMA for the broadcast transmission in the second time slot to improve the performance of the system through utilizing frequency diversity and spatial diversity.Considering the characteristic of two-way relaying,the relay beamforming matrixes are designed according to two methods respectively,i.e.,signal to leakage and noise ratio （SLNR） and block diagonalization based zero-forcing （BDZF）,on per subcarrier basis.The upper bound on the capacity region of this two-way relay network is also derived by using cut-set theory.Simulation results show that the proposed scheme outperforms three other two-way relaying schemes in terms of sum rate and can approach the upper bound of capacity region.

关 键 词：OFDM SDMA 放大转发双向中继 波束形成 

分 类 号：TN92[电子电信—通信与信息系统]