| 认知无线电中基于小波变换和干扰温度估计的频谱感知 |
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| 引用本文： | 陈昊,杨俊安,王岩. 认知无线电中基于小波变换和干扰温度估计的频谱感知[J]. 电路与系统学报, 2009, 14(6) |
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| 作者姓名： | 陈昊 杨俊安 王岩 |
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| 作者单位： | 解放军电子工程学院,安徽,合肥,230037;安徽省电子制约技术重点实验室,安徽,合肥,230037 |
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| 基金项目： | 安徽省自然科学基金资助课题 |
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| 摘 要： | 干扰温度是认知无线电领域中引入的一种衡量频段上干扰强度的量.本文提出了基于小波变换和干扰温度估计的频谱感知策略.该思想首先利用小波变换分析无线宽带系统中信号功率谱密度变化的奇异点,将整个宽带频谱分为几个子区域,实现对无线传播环境的"粗感知";再运用多窗谱估计与奇异值分解(MTM-SVD)算法进行处理,获得每个子区域的干扰温度值;最后与干扰温度门限比较判决,从而得到适合认知无线电系统应用的频谱空洞,完成对无线传播环境的"细感知".
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| 关 键 词： | 认知无线电 干扰温度 小波变换 多窗谱估计 奇异值分解 |
Spectrum sensing based on wavelet transformation and interference temperature estimation for cognitive radio |
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| CHEN Hao,YANG Ju-nan,WANG Yan. Spectrum sensing based on wavelet transformation and interference temperature estimation for cognitive radio[J]. Journal of Circuits and Systems, 2009, 14(6) |
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| Authors: | CHEN Hao YANG Ju-nan WANG Yan |
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| Affiliation: | CHEN Hao1,2,YANG Jun-an1,WANG Yan1,2 ( 1 Electronic Engineering Institute,Hefei 230037,China,2. Key Laboratory of Electronic Restriction,Anhui Province,China ) |
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| Abstract: | Interference temperature is used for weighing intensity of interference within some bands. This paper proposes one method for spectrum sensing based on wavelet transformation and interference temperature estimation. The method divides two steps. First,it analyses the singularity of power spectral densities over a wide frequency using wavelet transformation. The signal spectrum is decomposed into elementary building blocks of subbands that are well characterized by local irregularities in frequency. The step... |
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| Keywords: | cognitive radio interference temperature wavelet transformation multitaper method singular value decomposition |
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