| 引用本文: | 刘海滨,丁宏,向良军,等.应用Kalman滤波器估计放大转发双向中继联合信道.[J].国防科技大学学报,2014,36(3):141-145.[点击复制] |
| LIU Haibin,DING Hong,XIANG Liangjun,et al.Cascade channel estimator based on Kalman filter for amplify-and-forward two-way relay networks[J].Journal of National University of Defense Technology,2014,36(3):141-145[点击复制] |
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| 应用Kalman滤波器估计放大转发双向中继联合信道 |
| 刘海滨, 丁宏, 向良军, 郑林华 |
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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: |
| 针对遵从放大转发协议的双向中继网络的联合信道估计问题，提出了一种基于Kalman滤波器的新方法。根据联合信道构成特点将其划分为自干扰部分及传输部分，通过AR模型对这两部分自相关函数进行近似化处理，建立了联合信道时变过程的状态方程，结合接收的训练序列信号，给出了具有Kalman滤波器形式的估计方法。在证明了该方法的一致收敛性质的同时，列出了误差性能限所满足的Riccati方程表达式。仿真结果表明，新估计方法相比于最大似然方法在均方误差方面具有明显的性能优势。 |
| 关键词: 放大转发 双向中继 联合信道估计 Kalman滤波器 |
| DOI：10.11887/j.cn.201403025 |
| 投稿日期：2013-09-05 |
| 基金项目: |
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| Cascade channel estimator based on Kalman filter for amplify-and-forward two-way relay networks |
| LIU Haibin, DING Hong, XIANG Liangjun, ZHENG Linhua |
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(College of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073, China)
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| Abstract: |
| A cascade channel estimation of Amplify-and-Forward (AF) two-way relay networks (TWRN) was investigated, and a new estimator was proposed based on Kalman filter. Firstly, a cascade channel of AF TWRN was divided into self-interference part and transmission part functionally. Then, auto-correlation functions of these two parts (ACF) were approximated by auto-regressive (AR) model to obtain the Gauss-Markov process of the channel, and the resultant Kalman estimator was deduced according on the received training signals. After the property of convergence was proved, the bound of mean square error (MSE) was also derived in the form of Riccati equation. The final numeral simulation demonstrates that the new estimator outperforms its maximum likelihood (ML) counterpart in the merit of MSE. |
| Keywords: amplify-and-forward two-way relay networks cascade channel estimation Kalman filter |
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