| 小波基下的多分辨率SURE阈值信号估计 |
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| 引用本文： | 吴冬梅. 小波基下的多分辨率SURE阈值信号估计[J]. 西安科技大学学报, 2005, 25(3): 345-348 |
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| 作者姓名： | 吴冬梅 |
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| 作者单位： | 西安科技大学,通信与信息工程学院,陕西,西安,710054 |
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| 摘 要： | 根据小波阈值估计理论，通过最小化风险的估计，可计算自适应于数据的阈值，提高估计的信噪比。分析了噪声和信号在小波分解下的特性，提出了小波基下自适应于每一尺度的多分辨率SURE阈值算法，并采用该算法对被噪声污染的信号进行了估计，阈值T选取统一阈值，噪声的标准差由中位公式求出。仿真结果表明，与传统的小波阈值法相比，该算法明显地提高了估计的SNR。
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| 关 键 词： | 信号估计 小波阈值 多分辨率SURE闽值 |
| 文章编号： | 1672-9315（2005）03-0345-04 |
| 收稿时间： | 2004-09-09 |
| 修稿时间： | 2004-09-09 |
Signal estimation with multiresolution threshold using principle of SURE in wavelet basis |
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| WU Dong-mei. Signal estimation with multiresolution threshold using principle of SURE in wavelet basis[J]. JOurnal of XI’an University of Science and Technology, 2005, 25(3): 345-348 |
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| Authors: | WU Dong-mei |
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| Abstract: | In theory of estimation with wavelet thresholding, the threshold adapting data can be calculated by minimum estimation of risk to improve the SNR of estimation. This paper analyzes the different characteristics of signal and noise under wavelet transform, and proposes an algorithm of multiresolution threshold adapting each scale using principle of SURE in wavelet basis. The simulation shows that the SNR of estimation is improved evidently using this algorithm in comparison with traditional wavelet thresholding. |
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| Keywords: | signal estimation wavelet thresholding multiresolution SURE threshold |
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