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频能量分布
相关语句
  frequency energy distribution
     As a Fourier transformation of time correlation function the Wigner distribution is always called “time frequency energy distribution”. For solving the existing problems of aliasing and restoring to original signal. i.e, the inverse transformation, a new definition of discrete Wigner distribution has been proposed.
     维格纳分布被表述为时间相关函数的傅立叶变换,称为信号“时-频能量分布”.针对其离散形式存在混迭与恢复原信号——反变换等问题,提出离散维格纳分布定义,并通过实例说明离散维格纳分布具有无混迭和能正确恢复时域信号的特点.
短句来源
     Physical analysis and theoretical predictions indicate that the proposed transform essentially performs a nonlinear segmentation of the time frequency energy distribution, as opposed to many other transforms characterized by linear segmentation such as the Fourier transform, short time Fourier transform (including the Gabor transform), wavelet transform and chirplet transform which are all special cases of the Dopplerlet transform with specific parameters.
     对其物理机制的分析表明 :该变换实质上是对信号的时频能量分布进行非线性分割 ,而以线性分割为特征的 Fourier变换、短时 Fourier变换 (包括 Gabor变换 )、小波变换、chirplet变换则均是Dopplerlet变换在其参数取特定值时的特例。
短句来源
  “频能量分布”译为未确定词的双语例句
     Energy density distributions of vertical ground velocities for 80 kg TNT explosion on the ground surface varying with time show that at the moment of peak particle velocity arriving, the frequency range of blast vibrations is very wide,being the relatively narrow bands at the other moments,and the peak time-frequency energy just corresponds to the peak particle velocity arriving time of blast vibration.
     80 kg TNT地面爆炸时地面垂向振动速度的时间能量密度分布情况表明,在质点振动峰值速度到达时刻爆炸振动的频率范围比较宽,而其他时刻的振动频率相对较为集中,时频能量分布的峰值正好对应于爆炸振动速度的峰值到达时间。
短句来源
  相似匹配句对
     The distribution of light power is studied.
     并研究其能量分布
短句来源
     A contrastive study on energy distribution characteristics of earthquake and explosion in T-F domain
     地震和爆破时能量分布特征的对比分析
短句来源
     THE ENERGY OF DOUBLE-STAR SYSTEM AND ITS DISTRIBUTION
     双星系统的能量及其分布
短句来源
     Self-Adaptive Vowel-Frame Detection Algorithm Based on Energy Distribution Analysis in Frequency Domain
     基于能量分布分析的自适应元音帧提取算法
短句来源
     INSTANTANEOUS FREQUENCY AND TIME-FREQUENCY DISTRIBUTIONS
     瞬时率和时分布
短句来源
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  frequency energy distribution
We present the results of a study of the space-frequency energy distribution of the near acoustic field of noise radiation from a moving source.
      
Preliminary report on global seismicity-frequency energy distribution of earthquakes
      
Unlike the Wigner and the Cohen class distributions, the time-frequency energy distribution revealed by MP does not include cross terms.
      


In this paper,we present a new algorithm,called adaptive oriented orthogonal projective decomposition (AOP),to decompose a signal into a sum of Gauss functions. The elementary functions used in AOP are the dilations,modulations and translations of a normalized Gauss function. They can be adjusted to best match the original signal. We derive a Time-Frequency energy distribution, by adding the Wigner-Ville distribution of the selected elementary functions. Since the Gauss functions are well localized in the time-frequency...

In this paper,we present a new algorithm,called adaptive oriented orthogonal projective decomposition (AOP),to decompose a signal into a sum of Gauss functions. The elementary functions used in AOP are the dilations,modulations and translations of a normalized Gauss function. They can be adjusted to best match the original signal. We derive a Time-Frequency energy distribution, by adding the Wigner-Ville distribution of the selected elementary functions. Since the Gauss functions are well localized in the time-frequency domain,the AOP distribution has high resolution,no crossterm and no negative energy. It's a powerful tool of time-frequency analysis.

本文提出了一种新的时一频分解方法──自适应旋转投影分解法(AOP法).在表征信号空间的线性调频高斯信号集上,我们针对原始信号自适应地搜索出一组与信号匹配最好的基函数序列.以此用尽可能少的基函数来重构信号子空间.根据分解系数,得到信号的时-频能量分布.由于调频高斯信号时频会聚性能极佳,又能灵活高效地匹配各类信号,该算法不论从分辨率、效率还是描述能力等方面都具有良好的性能.将它用于语音压缩也取得了很好的结果.

As a Fourier transformation of time correlation function the Wigner distribution is always called “time frequency energy distribution”. For solving the existing problems of aliasing and restoring to original signal. i.e, the inverse transformation, a new definition of discrete Wigner distribution has been proposed. Its features of nonaliasing and correctly restoring the signal in time domain are illustrated here through a practical example.

维格纳分布被表述为时间相关函数的傅立叶变换,称为信号“时-频能量分布”.针对其离散形式存在混迭与恢复原信号——反变换等问题,提出离散维格纳分布定义,并通过实例说明离散维格纳分布具有无混迭和能正确恢复时域信号的特点.

A new frequency synchronization algorithm for wireless orthogonal frequency division multiplexing(OFDM) systems has been proposed.The method is based on the distribution of the pilot energy,which utilizes the pilots' energy efficiently by collecting the energy leaking into the neighbour sub-carriers,and gives coarse and fine estimations of the frequency offset at the same time.Furthermore,an accumulator is designed to fulfill the algorithm and to make a good trade off between the performance and the synchronization...

A new frequency synchronization algorithm for wireless orthogonal frequency division multiplexing(OFDM) systems has been proposed.The method is based on the distribution of the pilot energy,which utilizes the pilots' energy efficiently by collecting the energy leaking into the neighbour sub-carriers,and gives coarse and fine estimations of the frequency offset at the same time.Furthermore,an accumulator is designed to fulfill the algorithm and to make a good trade off between the performance and the synchronization time.Computer simulation results demonstrate that the proposed method performs well even at high Doppler frequency shifts.

提出了一种新的频率同步算法,并将其用于无线正交频分复用(OFDM)系统.该算法根据扩散后的导频能量分布特征,充分利用扩散到相邻子载波上的pilot能量,同时完成了频率粗估计和精估计.还设计了一个实用的积累流程来实现该算法,可以在估计性能和同步时间之间做较好的折中.仿真结果表明,在不同多普勒频偏下,该算法都具有良好的性能.

 
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