| 改进的OFDM带宽盲估计方法 |
| |
| 引用本文： | 刘明骞,李兵兵,王婧舒.改进的OFDM带宽盲估计方法[J].华中科技大学学报(自然科学版),2011(5):88-91. |
| |
| 作者姓名： | 刘明骞 李兵兵 王婧舒 |
| |
| 作者单位： | 西安电子科技大学综合业务网理论与关键技术国家重点实验室; |
| |
| 基金项目： | 国家高技术研究发展计划资助项目(2007AA01Z288); 国家自然科学基金资助项目(60772138); 高等学校学科创新引智计划资助项目(B08038) |
| |
| 摘 要： | 针对正交频分复用信号通过快速傅里叶变换变换得到的频谱不够精确且计算量较大的问题,提出一种基于Welch法的带宽盲估计方法.首先用Welch法求得功率谱,再进行小波分解、重构,得到平滑的功率谱;然后提取出最大移动协方差的2个值所在的位置进而估计带宽;最后多次循环求统计平均,得到信号的精确带宽.实验仿真结果表明:在多径且低信噪比为0dB的条件下,该方法的正确估计率达99.1%,比传统方法的带宽估计精度更高,计算复杂度更低.
|
| 关 键 词： | 带宽估计 正交频分复用 小波变换 Welch法 移动协方差 |
Improved OFDM bandwidth estimation scheme |
| |
| Liu Mingqian Li Bingbing Wang Jingshu.Improved OFDM bandwidth estimation scheme[J].JOURNAL OF HUAZHONG UNIVERSITY OF SCIENCE AND TECHNOLOGY.NATURE SCIENCE,2011(5):88-91. |
| |
| Authors: | Liu Mingqian Li Bingbing Wang Jingshu |
| |
| Institution: | Liu Mingqian Li Bingbing Wang Jingshu(State Key Laboratory of Integrated Service Networks,Xidian Universi ty,Xi′an 710071,China) |
| |
| Abstract: | The traditional orthogonal frequency division multipl ex ing(OFDM) bandwidth estimation scheme uses fast Fourier transform(FFT) to esti mate the spectrum,while the spectrum is not very precise and the quantity of ca lculation is larger.Thus,a bandwidth estimation scheme based th e Welch method was proposed.First the scheme estimated the power spectrum of OF DM with the Welch method.Second the spectrum was decomposed and reconstructed b y wavelet transform in order to become smooth.Then the moving covariance... |
| |
| Keywords: | bandwidth estimate orthogonal frequency divis ion multiplexing(OFDM) wavelet transform the Welch method moving covariance |
| 本文献已被 CNKI 等数据库收录！ |
