| 引用本文: | 许可,万建伟,王玲.Rayleigh衰落信道下一种实用的Turbo解码算法.[J].国防科技大学学报,2011,33(4):113-116,174.[点击复制] |
| XU Ke,WAN Jianwei,WANG Ling.A Practical Turbo Decoding Algorithm on Rayleigh Fading Channels[J].Journal of National University of Defense Technology,2011,33(4):113-116,174[点击复制] |
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| Rayleigh衰落信道下一种实用的Turbo解码算法 |
| 许可, 万建伟, 王玲 |
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(国防科技大学 电子科学与工程学院，湖南 长沙 410073)
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| 摘要: |
| 通过理论和仿真实验证明：无论Rayleigh衰落信道是否完美估计，Max-Log-MAP算法都与信噪比无关，而且还与其他信道参数无关。通过缩放Max-Log-MAP算法输出软信息的幅度，在没有增加运算量的前提下，解码性能提高到了与Log-MAP算法相当的程度。由于缩放软信息的Max-Log-MAP算法不需要任何信道参数估计器，从解码性能，运算量和系统鲁棒性等方面综合比较，使用缩放软信息的Max-Log-MAP算法是Rayleigh衰落信道下Turbo解码的一种实用方案。 |
| 关键词: Turbo解码 Rayleigh衰落信道 信道置信度 Max-Log-MAP算法 Log-MAP算法 |
| DOI： |
| 投稿日期：2010-09-20 |
| 基金项目:湖南省自然科学基金项目(11JJ3066) |
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| A Practical Turbo Decoding Algorithm on Rayleigh Fading Channels |
| XU Ke, WAN Jianwei, WANG Ling |
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(College of Electronic Science and Engineering, National Univ. of Defense Technology, Changsha 410073, China)
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| Abstract: |
| It is confirmed by theoretical analysis and simulation results that, whether the Rayleigh fading channel is perfectly estimated or not, the Max-Log-MAP algorithm is independent of the channel signal-to-noise ratio (SNR).In addition, the Max-Log-MAP algorithm does not depend on any other channel parameter. By scaling the soft output, the Max-Log-MAP decoder performs nearly as well as the Log-MAP decoder, while this gain is achieved without any complexity increase. As no channel parameter estimator is needed, from a practical point of view, decoding turbo codes on the Rayleigh fading channels with the Scaled Max-Log-MAP algorithm is a good compromise among the performance, the complexity and the system robustness. |
| Keywords: turbo decoding rayleigh fading channels channel reliability factor Max-Log-MAP algorithm Log-MAP algorithm |
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