| 多电平调制的Turbo MMSE线性均衡算法 |
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| 引用本文： | 李静,彭华,葛临东.多电平调制的Turbo MMSE线性均衡算法[J].应用科学学报,2005,23(6):568-572. |
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| 作者姓名： | 李静 彭华 葛临东 |
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| 作者单位： | 信息工程大学,信息工程学院,河南,郑州,450002 |
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| 摘 要： | 均衡器与译码器之间的信息传递是turbo均衡设计的关键问题.该文描述了适合多电平调制的turbo最小均方误差线性均衡(MMSE-LE)算法,并以Gray映射的16QAM调制为例,推导了均衡器输出外信息的简化计算方法.另外还讨论了几种译码器外信息的计算方法,提出一种新的译码器外信息反馈机制.仿真结果表明文中提出的turbo均衡算法是有效的,在某些条件下比其他方法更具优势.
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| 关 键 词： | 信道均衡 最小均方误差 turbo均衡 信道译码 |
| 文章编号： | 0255-8297（2005）06-0568-05 |
| 收稿时间： | 2004-07-28 |
| 修稿时间： | 2004-07-282004-11-01 |
Turbo MMSE Linear Equalization for Multi-level Modulations |
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| LI Jing,PENG Hua,GE Lin-dong.Turbo MMSE Linear Equalization for Multi-level Modulations[J].Journal of Applied Sciences,2005,23(6):568-572. |
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| Authors: | LI Jing PENG Hua GE Lin-dong |
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| Institution: | Institute of Information Engineering, Information Engineering University, Zhengzhou 450002, China |
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| Abstract: | A turbo equalizer is able to overcome severe inter-symbol-interferences because it benefits from the channel decoding gain by iteratively performing equalization and channel decoding.One of the key problems involved in turbo equalization is the information transmission between the equalizer and the decoder.In this paper,a linear minimum mean square error(MMSE) equalizer for turbo equalization of multi-level modulations is discussed.Simplified computation of the equalizer's extrinsic information for 16QAM modulation is presented.The extrinsic information of the decoder is also discussed,and a new extrinsic information feeding-back scheme proposed.Simulation results show that the proposed algorithm works effectively for multi-level modulations over severe frequency selective channel. |
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| Keywords: | equalizer MMSE turbo equalization channel decoding |
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