| OFDM系统中基于Turbo迭代的WLMS联合信道估计和检测算法 |
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| 引用本文： | 白宾锋,蔡跃明,徐信.OFDM系统中基于Turbo迭代的WLMS联合信道估计和检测算法[J].电子与信息学报,2007,29(1):152-156. |
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| 作者姓名： | 白宾锋 蔡跃明 徐信 |
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| 作者单位： | 1. 解放军理工大学通信工程学院,南京,210007;总参第63研究所,南京,210007
2. 解放军理工大学通信工程学院,南京,210007 |
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| 基金项目： | 江苏省自然科学基金
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国家高技术研究发展计划(863计划) |
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| 摘 要： | 利用Turbo迭代原理，该文提出了一种迭代的维纳LMS联合信道估计和检测算法，该算法利用软映射和软解映射算法提供的软值信息，实现检测译码模块和信道估计模块之间的信息交换，通过WLMS信道估计和跟踪算法实现信道响应的逐符号更新。仿真结果表明，通过2次迭代，系统误码率性能已经基本收敛，而且在系统误码率低于10-3 时，与理想信道估计性能相比，联合估计和检测算法性能信噪比损失仅为0.5-0.8dB。
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| 关 键 词： | 正交频分复用 Turbo迭代 维纳LMS算法 |
| 文章编号： | 1009-5890（2007）01-0152-05 |
| 收稿时间： | 2005-03-14 |
| 修稿时间： | 2005-09-07 |
A Joint WLMS Channel Estimation and Detection Algorithm Based on Turbo Iteration in OFDM Systems |
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| Bai Bin-feng,Cai Yue-ming,Xu Xin.A Joint WLMS Channel Estimation and Detection Algorithm Based on Turbo Iteration in OFDM Systems[J].Journal of Electronics & Information Technology,2007,29(1):152-156. |
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| Authors: | Bai Bin-feng Cai Yue-ming Xu Xin |
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| Affiliation: | Institute of Communications Engineering, PLAUST, Nanjing 210007, China;The 63rd Research Institute of PLA General Staff Headquarters, Nanjing 210007, China |
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| Abstract: | A joint WLMS channel estimation and detection algorithm based Turbo iteration is proposed in this paper. Using the soft information provided by the soft mapping and demapping algorithms, the proposed algorithm achieve its information exchange between detection module and channel estimation module. The channel response is updated symbol by symbol by using the WLMS channel estimation and tracking algorithm. The simulation results show that the BER performance had converged after two iterative, and there is only 0.4-0.5dB performance losing compared with ideal channel estimation at a system BER of10^-3 . |
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| Keywords: | OFDM Turbo iteration Wiener LMS algorithm |
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