| 迭代均衡系统中的一种SNR估计方法 |
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| 引用本文： | 李强, WHMow, 李少谦. 迭代均衡系统中的一种SNR估计方法[J]. 电子与信息学报, 2008, 30(4): 836-839. doi: 10.3724/SP.J.1146.2006.01490 |
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| 作者姓名： | 李强 W H Mow 李少谦 |
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| 作者单位： | 电子科技大学通信学院抗干扰移动通信国家重点实验室,成都,610054;香港科技大学电子与电机工程系,香港 |
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| 摘 要： | 该文首先分析了最大后敛概率(Maximum A posterior Probability, MAP)迭代均衡及其简化算法Max-Log- MAP(MLM)、缩放软信息的Max-Log-MAP算法(Scaled Max-Log-MAP，SMLM)对SNR估计误差的敏感性问题，然后利用SMLM算法对SNR估计误差不敏感的特性，提出了一种基于SMLM的软输出信息估计信道SNR的方法。最后，利用该算法，还提出了一种新的迭代均衡算法，并研究了其性能，结果表明该算法不仅不需要任何导引符号开销，还能获得非常接近具有理想的SNR的MAP算法的误码性能。
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| 关 键 词： | 缩放Max-Log-MAP算法 软输出信息 SNR估计 迭代均衡 |
| 文章编号： | 1009-5896(2008)04-0836-04 |
| 收稿时间： | 2006-09-30 |
| 修稿时间： | 2006-09-30 |
A SNR Estimation Method in Turbo Detection System |
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| Li Qiang, W H Mow, Li Shao-qian. A SNR Estimation Method in Turbo Detection System[J]. Journal of Electronics & Information Technology, 2008, 30(4): 836-839. doi: 10.3724/SP.J.1146.2006.01490 |
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| Authors: | Li Qiang W H Mow Li Shao-qian |
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| Affiliation: | National Key Lab. of Communication, Univ. of Electronic Science & Tech. of China, Chengdu 610054, China;Spt. of Electronic and Electric Engineering, Hongkong University of Science and Technology, Hongkong, China |
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| Abstract: | In this paper, the sensitivity of MAP algorithm and its reduced ones as Max-Log-MAP and Scaled Max-Log-Map to SNR mismatch in turbo detection systems are analyzed. Due to the fact of insensitivity of Scaled Max-Log-MAP algorithm to SNR mismatch, a new SNR estimation method is proposed using the soft output extrinsic information. Then, a new turbo equalization scheme is also provided utilizing the SNR estimation algorithm, and the corresponding performance of new equalization algorithm is also studied. The simulation results show that new equalization scheme with reliability-based SNR estimation method performs very close to MAP algorithm with known SNR, although it does not need pilot symbols. |
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| Keywords: | Scaled Max-Log-Map algorithm Soft output information SNR estimation Turbo equalizer |
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