Cross spectral analysis of nonstationary processes

QSpace/Manakin Repository

Cross spectral analysis of nonstationary processes

Show simple item record White, Langford B Boashash, Boualem 2011-04-24T05:39:57Z 2011-04-24T05:39:57Z 1990-07
dc.identifier.citation IEEE Transactions on Information Theory, Vol. 36, No. 4, pp. 830-835 en_US
dc.identifier.issn 0018-9448
dc.description This paper was the first to introduce the notion of time-frequency coherence for non-stationary signals and processes, and propose a method for estimation. en_US
dc.description.abstract Consideration is given to the generalization of stationary cross spectral analysis methods to a class of nonstationary processes, specifically, the class of semistationary finite energy processes possessing sample functions that are of finite energy almost surely. A new quantity called the time-frequency coherence (TFC) is defined, and it is demonstrated that its properties are analogous to those possessed by the stationary coherence function. The problem of estimating the TFC by using elements of L. Cohen's (1966) class of joint time-frequency representations is investigated. It is shown that the only admissible estimators are those based on the class of time-frequency smoothed periodograms. Thus, the familiar procedure of segmentation and (smoothed) short-time Fourier analysis cannot be improved upon (within the framework considered) by the use of the higher-resolution nonparametric time-frequency methods. Procedures for selection of the appropriate estimators and a possible application are suggested. en_US
dc.description.sponsorship IEEE Information Theory Society en_US
dc.language.iso en en_US
dc.publisher IEEE en_US
dc.subject Cross-spectral analysis en_US
dc.subject non-stationary processes en_US
dc.subject time-frequency coherence en_US
dc.subject positive time-frequency distributions en_US
dc.subject spectrogram en_US
dc.subject short-time Fourier transform en_US
dc.subject time-frequency representations en_US
dc.title Cross spectral analysis of nonstationary processes en_US
dc.type Article en_US

Files in this item

Files Size Format View
Boashash-Lang_1 ... onstationary processes.pdf 550.8Kb PDF View/Open

This item appears in the following Collection(s)

Show simple item record

Search QSpace

Advanced Search


My Account