非精确信道状态信息下MIMO系统中的干扰删除  

Interference Cancellation in MIMO Systems with Imperfect Channel State Information

作　　者：许方敏[1] 陶小峰[1,2] 张平[1,2] 

机构地区：[1]北京邮电大学无线新技术研究所,北京100876 [2]泛网无线通信教育部重点实验室(北京邮电大学),北京100876

出　　处：《电子与信息学报》2008年第12期2934-2937,共4页Journal of Electronics & Information Technology

基　　金：国家自然科学基金重大项目(60496312);国家863计划项目(2006AA01Z260)资助课题

摘　　要：复杂的多天线环境中,未知的干扰和噪声无处不在,这些因素不但引起了多输入多输出(MIMO)系统信号检测的偏差,还加大了获取精确信道状态信息(CSI)的难度。因此,为了删除MIMO系统中的未知干扰,该文建立了非精确CSI下的系统模型,模型中的非线性函数表示MIMO系统中的干扰。基于非参数理论提出了针对这种干扰的干扰删除方法。与以往方法不同的是,模型中的干扰是完全未知的。进一步地,从理论上证明了干扰删除的有效性,即证明了估计函数的收敛性。仿真结果表明,所提出的方法能有效地删除系统中的干扰。Unknown interference and noise are ubiquitous in the complexity multi-antennas environment. They not only reduce precision of signal detection in Multi-Input Multi-Output （MIMO） systems seriously but also make it difficult to obtain perfect Channel State Information （CSI）. In this paper, to cancel unknown interference in MIMO systems, a new approach for modeling these systems with imperfect CSI is introduced. The interference is treated as a nonlinear function in the model and estimated based on nonparametric theory. Unlike other interference cancellation methods, the interference treated here is unknown absolutely. Furthermore, the proposed interference cancellation is proved to be effective via theoretical analysis. That is, estimation of the interference is convergent. Simulation results demonstrate that the interference cancellation proposed here is valid for MIMO systems with imperfect CSI.

关 键 词：多输入多输出(MIMO) 非精确信道状态信息 未知干扰 非参数理论 

分 类 号：TN911.4[电子电信—通信与信息系统]