Search - time-frequency

[Other] fh

Description: Frequency Hopping Spread Spectrum 这是一个跳频信号的时频分析程序-Frequency Hopping Spread Spectrum is a frequency-hopping time-frequency analysis program
Platform: | Size: 1024 | Author: 潘涛 | Hits:

Description: 在高阶谱分析工具箱是一个M文件集合实施了多种先进的信号处理算法的频谱估计，polyspectral估计，时频分布计算，并包含许多实际应用如时延估计，谐波恢复，参数估计的Volterra（非线性）模型，以及自适应线性预测。其他潜在的应用包括音响，生物医学，经济学，地震勘探，无损检测，海洋学，等离子体物理，雷达，声纳，语音等-The Higher-Order Spectral Analysis Toolbox is a collection of M-files that implement a variety of advanced signal processing algorithms for spectral estimation, polyspectral estimation, and computation of time-frequency distributions, with applications such as time delay estimation, harmonic retrieval, parameter estimation of Volterra (nonlinear) models, and adaptive linear prediction. Other potential applications include acoustics, biomedicine, econometrics, exploration seismology, nondestructive testing, oceanography, plasma physics, radar, sonar, speech etc.
Platform: | Size: 2881536 | Author: chenpan | Hits:

[Software Engineering] short-termloadforecastingwithchaostimeseries

Description: 文章展示了一种新的方法用于功率系统中短期负载预测。提出的方案使用混沌时间序列分析基于确定性混沌去捕捉复杂的负载行为特征。确定性的混沌允许我们重构一个时间序列并决定输入的变量个数。这篇文章描述了混沌时间序列对日间功率系统峰值的分析。确定性混沌的非线性图形通过多层感知器的神经网络得到。提出的方案在一个例子中具体阐述。-This paper presents a new approach to short-term load forecasting in power systems. The proposed method makes use of chaos time series analysis that is based on deterministic chaos to capture characteristics of complicated load behavior. Deterministic chaos allows us to reconstruct a time series and determine the number of input variables. This paper describes chaos time series analysis of daily power system peak loads. The nonlinear mapping of deterministic chaos is identified by the multilayer perceptron of an artificial neural network. The proposed approach is demonstrated in an example.
Platform: | Size: 382976 | Author: will | Hits:

[matlab] hht-daima

Description: hht（希尔伯特黄变换）的matlab工具箱，其中包括时频分析工具箱-hht (Hilbert-Huang Transform) of the matlab toolbox, including the time-frequency analysis toolbox
Platform: | Size: 184320 | Author: yaoho | Hits:

[matlab] time-frequencyanalysis

Description: 时频分析的工具，完成时频分析，希望能够对大家有帮助，共同进步！-Time-frequency analysis tools, complete the time-frequency analysis in hopes of help, make progress together!
Platform: | Size: 2866176 | Author: 刘实 | Hits:

[Communication-Mobile] 01523714

Description: A Rate-one Full-diversity Low-complexity Space-Time-Frequency Block Code (STFBC) for 4-Tx MIMO-OFDM
Platform: | Size: 154624 | Author: Bhasker gupta | Hits:

[Software Engineering] 3.5GHz--channel-measurements

Description: 在3.49-3.51GHZ频段内的典型中国城市环境下，地面信号衰落仍服从经典的指数对数分布。在中度误差（σx =10.291）下，路损指数在3.1-3.7之间。半径2公里的小区内，RMS时延在3-4微秒之间；典型的办公室环境中，存在直达径时RMS时延小于0.1微秒。在城市环境中，多径现象很明显，主要由高层建筑物引起，并以簇的方式存在。在城市中低速移动条件下（接收机移动速度小于100 Km/h）某一强径的生存时间通常超过10分钟，但相对到达时间会发生滑动。单一小区内的传播环境具有一定相关性，如果存在直达径，相关性会上升到0.4-0.5。此外，室外室内的测量结果都可以证明Jake模型关于入射角分布假设的合理性。当天线间距在1个载波波长增大到10个载波波长时，天线相关性在0.05-0.4之间。 SIMO信道探测系统能够揭示B3G信道的很多特征，但不能够全面、充分的分析和评估B3G信道。在后续工作中，我们将进一步改进这个测试系统，对B3G系统作更深入的研究。参考-Aided by a 1-Tx and 2-Rx system working in 3.5GHz frequency and 20MHz bandwidth, JSI-MTLab studied the classic B3G urban wireless propagation environment of China and the classic indoor channel propagation environment through a recent indoor and outdoor wireless propagation measurement. A new path loss exponent is proposed in such band while the general outdoor model of path loss is verified. Also, the statistic results of RMS excess delay, max excess delay and mean excess delay in both indoor and outdoor scenarios are given. The lag-time domain and time-frequency domain channel responses are analyzed. At the end, the results of correlation of different propagation environment in the singular cell and antenna correlation are given as well as the phenomenon being analyzed and explained.
Platform: | Size: 159744 | Author: xuchen | Hits:

[matlab] crosscorelation

Description: In signal processing, cross-correlation is a measure of similarity of two waveforms as a function of a time-lag applied to one of them. This is also known as a sliding dot product or inner-product. It is commonly used to search a long duration signal for a shorter, known feature. It also has applications in pattern recognition, single particle analysis, electron tomographic averaging, cryptanalysis, and neurophysiology.
Platform: | Size: 1024 | Author: Rafal | Hits:

[matlab] ECGSYNC-physionet

Description: ECGSYN generates a synthesized ECG signal with user-settable mean heart rate, number of beats, sampling frequency, waveform morphology (P, Q, R, S, and T timing, amplitude,and duration), standard deviation of the RR interval, and LF/HF ratio (a measure of the relative contributions of the low and high frequency components of the RR time series to total heart rate variability).
Platform: | Size: 4096 | Author: Ma | Hits:

[VHDL-FPGA-Verilog] digital-frequency-meter

Description: 数字频率计的设计，1.频率测量范围：1Hz—9999Hz。 2.数字显示位数：4位数字显示。3.被测信号幅度Ui=0.5—5V（正弦波、三角波、方波）。4.测量时间：t≤1.5S-The design of digital frequency meter, 1. Frequency Range: 1Hz-9999Hz. 2. Digital Display digits: 4-digit display. 3. The measured signal amplitude Ui = 0.5-5V (sine wave, triangle wave, square wave). 4. Measurement time: t ≤ 1.5S
Platform: | Size: 51200 | Author: 翟明 | Hits:

[Software Engineering] A-crop-phenology-detection-method-using-time-seri

Description: Information of crop phenology is essential for evaluating crop productivity and crop management. Therefore we developed a new method for remotely determining phenological stages of paddy rice. The method consists of three procedures: (i) prescription of multi- temporal MODIS/Terra data (ii) filtering time-series Enhanced Vegetation Index (EVI) data by time-frequency analysis and (iii) specifying the phenological stages by detecting the maximum point, minimal point and inflection point from the smoothed EVI time profile. Applying this method to MODIS data, we determined the planting date, heading date, harvesting date, and growing period in 2002. And we validated the performance of the method against statistical data in 30 paddy fields. As for the filtering, we adopted wavelet -Information of crop phenology is essential for evaluating crop productivity and crop management. Therefore we developed a new method for remotely determining phenological stages of paddy rice. The method consists of three procedures: (i) prescription of multi- temporal MODIS/Terra data (ii) filtering time-series Enhanced Vegetation Index (EVI) data by time-frequency analysis and (iii) specifying the phenological stages by detecting the maximum point, minimal point and inflection point from the smoothed EVI time profile. Applying this method to MODIS data, we determined the planting date, heading date, harvesting date, and growing period in 2002. And we validated the performance of the method against statistical data in 30 paddy fields. As for the filtering, we adopted wavelet
Platform: | Size: 334848 | Author: Pham Duy Tien | Hits:

[matlab] idbm

Description: Description Applies ideal binary mask to noise corrupted speech signal. The processing takes place within an FFT based short-time spectral analysis-modification-synthesis framework. The ideal binary mask is computed from an oracle (true) signal-to-noise ratio (SNR) through thresholding with local SNR criterion. The routine returns synthesized enhanced speech, the ideal binary mask and the true instantaneous spectral SNR.
Platform: | Size: 903168 | Author: fatz | Hits:

[Program doc] Direction-Finding-Based-on-Spatial-Time---Frequen

Description: Direction Finding Based on Spatial Time - Frequency Distribution Matrix
Platform: | Size: 165888 | Author: dong | Hits:

[matlab] signal-frequency-analysis-simulation

Description: 很全的时频分析工具，很全的时频分析工具-Is the whole time-frequency analysis tool, is the whole time-frequency analysis tools. .
Platform: | Size: 235520 | Author: 彭赛丽 | Hits:

[matlab] MATLABTime-frequency-analysis

Description: 专门介绍利用matlab软件进行时间-频率分析的电子书，希望对大家有帮助-Devoted to using matlab software for time- frequency analysis of the e-book, and I hope all of you to help
Platform: | Size: 14187520 | Author: li | Hits:

[matlab] Time-Frequency-Analysis-in-Matlab

Description: 使用四分量高斯包络信号进行时频分析，比较比较STFT、WVD、CWD分辨率和交叉干扰情况，包含仿真代码及Matlab时频分析工具箱。工具箱的使用建议参考《Matlab时频分析技术及其应用-葛哲学》，压缩包中顺便包含了该书的源代码。-The four-component Gaussian envelope signal frequency analysis, comparison compare STFT on WVD, CWD resolution and cross-interference, frequency analysis toolbox contains the simulation code and Matlab. Use the recommended reference toolbox " Matlab frequency analysis technology and its application- Gezhe school" book contains the source code compression package the way.
Platform: | Size: 2310144 | Author: 吉韦 | Hits:

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