Advanced Topics in System and Signal Theory

Advanced Topics in System and Signal Theory
Author :
Publisher : Springer Science & Business Media
Total Pages : 245
Release :
ISBN-10 : 9783642036392
ISBN-13 : 3642036392
Rating : 4/5 (92 Downloads)

Book Synopsis Advanced Topics in System and Signal Theory by : Volker Pohl

Download or read book Advanced Topics in System and Signal Theory written by Volker Pohl and published by Springer Science & Business Media. This book was released on 2009-10-03 with total page 245 pages. Available in PDF, EPUB and Kindle. Book excerpt: The requirement of causality in system theory is inevitably accompanied by the appearance of certain mathematical operations, namely the Riesz proj- tion,theHilberttransform,andthespectralfactorizationmapping.Aclassical exampleillustratingthisisthedeterminationoftheso-calledWiener?lter(the linear, minimum means square error estimation ?lter for stationary stochastic sequences [88]). If the ?lter is not required to be causal, the transfer function of the Wiener ?lter is simply given by H(?)=? (?)/? (?),where ? (?) xy xx xx and ? (?) are certain given functions. However, if one requires that the - xy timation ?lter is causal, the transfer function of the optimal ?lter is given by 1 ? (?) xy H(?)= P ,?? (??,?] . + [? ] (?) [? ] (?) xx + xx? Here [? ] and [? ] represent the so called spectral factors of ? ,and xx + xx? xx P is the so called Riesz projection. Thus, compared to the non-causal ?lter, + two additional operations are necessary for the determination of the causal ?lter, namely the spectral factorization mapping ? ? ([? ] ,[? ] ),and xx xx + xx? the Riesz projection P .


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