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fct电化学工作站应用资料
发布:华洋科仪浏览次数:1331This study discusses the second-order improperness in the frequency-domain colored signal model. After the realvalued and colored signal in the time-domain is transformed into the frequency domain, the convolutive blind source separation (BSS) methods may generate a window indexed vector, and minimum variance distortionless response (MVDR) beamforming may produce an array sensor indexed vector, and the trial structured EEG data set may provide a trial-indexed vector. These three complex-valued vectors have such similarities: 1) despite of resulting from the Fourier transformation, they are not indexed by the frequency bins; 2) its real part and image part are proved to be correlated. Hence, such a complex-valued vector is improper, and the pseudo-autocorrelation matrix of this improper vector exists. Moreover, if components of an improper complex-valued vector are uncorrelated, except the autocorrelation matrix, the pseudo-autocorrelation matrix 首ld also be diagonal. This one more statistics could be useful to design better the complex-valued BSS algorithm and MVDR beamforming algorithm. 燃料电池测试仪
2012-12-12相关仪器 -
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