快时变衰落信道中基于时域加窗分段的OFDM均衡方法  

Equalization of Rapidly Time-Varying Channels for OFDM Systems Using Subblock Tracking

作　　者：李志为[1] 陈凯妍 钟清华[1] 

机构地区：[1]华南师范大学物理与电信工程学院,广州510006

出　　处：《华南师范大学学报（自然科学版）》2014年第4期48-54,共7页Journal of South China Normal University(Natural Science Edition)

基　　金：国家自然科学青年基金项目(61002012;61201255);广东省自然科学基金项目(S2013010016297)

摘　　要：在高速移动正交频分复用(OFDM)系统中,信道的快速变化引起载波间干扰(ICI),降低系统性能.为了有效地抑制由于信道时变引起的ICI,提出了一种时域分段线性处理的均衡算法.通过接收端时域加窗,使原有时变信道均衡简化为针对多个OFDM符号子块内的时不变线性处理,极大降低了信道均衡算法的复杂度.同时,从理论上解析了所提均衡算法的性能及加窗个数的优化,并推导出基于所提算法的信干比(SINR)闭式解.仿真结果以及复杂度分析表明,相比现有时变信道均衡方法,所提算法能明显提升系统性能,且计算复杂度更低.In high mobility orthogonal frequency division multiplexing （OFDM） systems, temporal time-variation of mobile channel induces intercarrier interference, leading to performance degradation. In order to combat ICI, a novel equalization method for OFDM systems in time-varying wireless channels is presented. By taking advantage of subblock tracking, whose aim is to force each subblock of one OFDM block as time-invariant such that channel equalization can be performed by a time-invariant structure. Meanwhile, signal-to-interference-plus-noise ratios （SINR） is numerically evaluated and derived as a close-form expression to further optimize the types of window functions. Simulation results show that the proposed scheme outperforms the conventional schemes, while requiring a lower complexity.

关 键 词：信道均衡 正交频分复用 快时变衰落信道 分段处理 

分 类 号：TN911.5[电子电信—通信与信息系统]