OQAM/OFDM系统中快速时变信道和CFO联合估计  

Joint Estimation of Fast Time Varying Channel and CFO in OQAM/OFDM System

作　　者：刘晓鹏[1,2] 陈西宏[2] 肖军[2] LIU Xiaopeng;CHEN Xihong;XIAO Jun(Unit 93636,PLA,Tianjin 301611,China;Air and Missile Defense College,Air Force Engineering University,Xi＇an 710051,China)

机构地区：[1]中国人民解放军93636部队 [2]空军工程大学防空反导学院

出　　处：《无线电工程》2018年第11期8-12,共5页Radio Engineering

基　　金：国家自然科学基金资助项目(61671468)

摘　　要：针对快速时变多径信道条件下,偏移正交幅度调制的正交频分复用(OQAM/OFDM)系统中信道和载波频率偏移(CFO)的联合估计问题,提出了一种基于期望最大化(EM)方法的基扩展(BEM)信道和联合估计方法。该方法将快速时变的信道建模为BEM模型,减少了信道的带估计参数,将CFO和接收符号作为完备信息,信道参数作为隐藏变量,利用EM方法迭代计算CFO和信道参数。该方法能够减少待估计参数,并实现高精度的CFO和信道估计性能,通过实验仿真对比验证了所提方法在快时变的无线信道条件下的有效性。In view of the joint estimation of channel and carrier frequency offset（ CFO） in OQAM/OFDM system under the fast time varying multi-path channel condition,this paper proposes a joint estimation method for CFO and basis expansion channel model（ BEM） based on expectation maximization（ EM） algorithm.The method firstly models the fast time varying channel as BEM to reduce the number of parameters to be estimated. Then the CFO and received signal are treated as completed information and channel parameters as hidden variable.Finally,the CFO and channel parameters are obtained through EM algorithm. The proposed method can reduce the number of the estimate parameters,and improve the estimation accuracy. The simulation results validate the efficacy and superior performance of the proposed method in fast time-varying wireless channel.

关 键 词：偏移正交幅度调制 正交频分复用 载波频率偏移 信道估计 联合估计 

分 类 号：TN911.6[电子电信—通信与信息系统]