Turbo編碼MIMO-OFDM系統(tǒng)中的EM迭代信道估計
EM Iterative Channel Estimation for Turbo Coded MIMO-OFDM Systems
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摘要: 該文對頻率選擇性衰落信道條件下的Turbo編碼多入多出正交頻分復(fù)用(MIMO-OFDM)系統(tǒng)的信道估計進(jìn)行了研究，提出了一種將Turbo迭代譯碼與EM迭代信道估計相結(jié)合的方法。采用該方法的EM迭代信道估計性能得到了明顯提高，且適合于非常惡劣的信道環(huán)境。另外，通過仿真可知，利用EM迭代信道估計算法的系統(tǒng)性能優(yōu)于利用簡化的最小二乘(LS)信道估計算法所獲得的系統(tǒng)性能。
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關(guān)鍵詞:
- MIMO-OFDM;Turbo迭代譯碼;EM迭代信道估計;最小二乘信道估計
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. -
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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