单载波MIMO系统中的一种鲁棒混合时频域均衡器  

A Robust Hybrid Time-Frequency Domain Equalizer for Single Carrier Broadband MIMO Systems

作　　者：周弘[1] 朱宇[1] 

机构地区：[1]复旦大学通信科学与工程系,上海200433

出　　处：《复旦学报（自然科学版）》2015年第6期713-720,共8页Journal of Fudan University：Natural Science

基　　金：国家科技重大专项(2012ZX03001013-004);国家自然科学基金(61271223)

摘　　要：单载波频域均衡(SC-FDE)技术是新一代通信3GPP-LTE/LTE-Advanced上行链路物理层的关键技术之一.针对非理想信道估计,基于信道估计误差的统计模型,提出了一种适用于单载波MIMO系统的联合频域均衡和时域判决反馈的鲁棒接收均衡器.以最小化均方误差(MSE)为设计准则,推导了均衡器系数和均方误差的表达式,并给出了误码率的近似表达式.仿真结果表明,该鲁棒的混合时频域均衡器较现有均衡器有显著性能提升,而且提出的近似误码率分析结果和实际仿真结果非常接近.Single carrier frequency domain equalization （SC-FDE） is an attractive technology for broadband wireless communications for its advantages such as low peak-to-average ratio. Based on a statistical model for channel estimation, we investigate the robust SC-FDE design for MIMO systems when considering the imperfect channel knowledge at receivers due to channel estimation errors. The optimal equalization coefficients are derived under the criterion of minimizing the mean square error （MSE） conditioned on a given channel estimate. To evaluate the system performance, we propose an auxiliary FDE systemand analyze its performance as approximation of the robust SC-FDE scheme. Simulation results show that the robust SC-FDE MIMO scheme can achieve significant performance improvement over the conventional non-robust FDE MIMO schemes, and that proposed theoretical performance approximation is very close to the simulated result.

关 键 词：单载波频域均衡 多输入多输出 非理想信道 判决反馈 鲁棒性 

分 类 号：TN911.5[电子电信—通信与信息系统]