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
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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。Abstract: 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.
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Li Y (G.), Seshadri N, Ariyavisitakul SChannel estimation for OFDM systems with transmitter diversity in mobile wireless channels[J].. IEEE J. on Select. Areas Commun.1999, 17(3):461-[2]Li Y (G). Simplified channel estimation for OFDM systems with multiple transmit antennas [J].IEEE Trans. on Wireless Commun.2002, 1(1):67-[5]Feder M, Weinstein E, Parameter estimation of superimposed signals using the EM algorithm [J]. IEEE Trans[J].on Acoust., Speech, Signal Processing.1988, 36(4):477-[6]Alamouti S M. A simple transmit diversity technique for wireless communications [J].IEEE J. on Select. Areas. Commun.1998, 16(8):1451- -
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