基于NSFC-OFDM的非协作式虚拟MIMO  

A Non-cooperative virtual MIMO based on NSFC-OFDM

作　　者：曾玖贞[1] 王超[1,2] 王彦[1] 邓贤君[1] 王明华[1] ZENG Jiuzhen WANG Chao WANG Yan DENG Xianjun WANG Minghua(College of Electrical Engineering, University of South China, Hengyang 421001, P. R. China College of Electrical and Information Engineering, Hunan University, Changsha 410082, P. R. China)

机构地区：[1]南华大学电气工程学院,湖南衡阳421001 [2]湖南大学电气与信息工程学院,长沙410082

出　　处：《重庆邮电大学学报（自然科学版）》2017年第3期327-334,共8页Journal of Chongqing University of Posts and Telecommunications(Natural Science Edition)

基　　金：中央高校基本科研项目(2014-004);国家自然科学基金(61172089);湖南省教育厅重点项目(16A181);湖南省科技计划项目(2014WK3001);衡阳市科技计划发展项目(2015KG48)~~

摘　　要：针对多用户配对虚拟MIMO(multiple input multiple output)安全性差,对信道估计器依赖性强的问题,提出一种基于非相干空频码(non-coherent space frequency code,NSFC)和正交频分复用(orthogonal frequency division multiplexing,OFDM)的非协作式虚拟MIMO。在分析NSFC成对错误概率的基础上,给出能满足全分集阶数和最大编码增益的编码准则。为了获得平行子信道传输效果,利用信道循环矩阵奇异值分解(singular value decomposition,SVD)后得到的酉矩阵分别进行预编码和预解码。基于最优NSFC和OFDM预编解码,提出一种新颖的虚拟MIMO策略。该虚拟MIMO在收发两端均无需信道瞬时信息,以非协作方式在单天线内模拟多天线收发效果。理论和仿真分析结果表明,虚拟MIMO系统能有效逼近实际理想MIMO的系统容量和误比特率性能,显著降低了虚拟MIMO系统的检测门限。In this work, a non-collaborative virtual MIMO （ multiple input multiple output ） based on NSFC （ non-coher-ent space frequency code ） and OFDM （ orthogonal frequency division multiplexing ） is proposed to counter the poor secur-ity performance and strong dependence on channel estimation of virtual MIMO using user-pairing algorithm. Basing on the analysis of the pair-wise error probability for NSFC, we define the coding criterion to obtain full diversity and optimal coding gain. Then, we present a valid pre-encoding and decoding for virtual MIMO utilizing the unitaiy matrices, which are ob-tained by singular value decomposing on the channel cyclic matrix. A novel virtual MIMO, based on the optimized NSFC and OFDM pre-encoding and decoding is proposed. Although the instantaneous channel state information is unavailable at both sender and receiver, the single-antenna users even gain the multiple antennas transmission effect in a non-cooperative way. Theoiy analysis and simulation results show that the proposed scheme achieves similar performance on the capacity and bit error rate to ideal MIMO.

关 键 词：虚拟多输入输出 非协作 非相干空频码 正交频分复用 

分 类 号：TN914[电子电信—通信与信息系统]