Turbo编码MIMO-OFDM系统中的EM迭代信道估计  

EM Iterative Channel Estimation for Turbo Coded MIMO-OFDM Systems

作　　者：乔晓强[1] 蔡跃明 徐信[1] 徐友云[1] 

机构地区：[1]解放军理工大学通信工程学院,南京210007

出　　处：《电子与信息学报》2006年第1期143-146,共4页Journal of Electronics & Information Technology

基　　金：国家863计划(2003AA12331007)资助课题

摘　　要：该文对频率选择性衰落信道条件下的Turbo编码多入多出正交频分复用(MIMO-OFDM)系统的信道估计进 行了研究,提出了一种将Turbo迭代译码与EM迭代信道估计相结合的方法。采用该方法的EM迭代信道估计性能 得到了明显提高,且适合于非常恶劣的信道环境。另外,通过仿真可知,利用EM迭代信道估计算法的系统性能优 于利用简化的最小二乘(LS)信道估计算法所获得的系统性能。The channel estimation for Turbo coded Multiple-Input Multiple-Output Orthogonal Frequency Division Multiplexing （MIMO-OFDM） systems in frequency selective fading channels is studied, A method combining Turbo codes and iterative decoding with Expectation-Maximization （EM）-type iterative channel estimation algorithms is presented, which can improve the system performance greatly. The algorithms can also be applied to the very bad channel environments. Furthermore, from the simulation, the system performance with EM-type iterative channel estimation algorithms outperforms that with simplified LS channel estimation algorithms.

关 键 词：MIMO-OFDM TURBO迭代译码 EM迭代信道估计 最小二乘信道估计 

分 类 号：TN929.5[电子电信—通信与信息系统]