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المؤلفBoashash, B.
المؤلفOuelha, Samir
تاريخ الإتاحة2020-09-20T08:35:38Z
تاريخ النشر2017
اسم المنشورIEEE Transactions on Signal Processing
المصدرScopus
الرقم المعياري الدولي للكتاب1053587X
معرّف المصادر الموحدhttp://dx.doi.org/10.1109/TSP.2017.2669899
معرّف المصادر الموحدhttp://hdl.handle.net/10576/16193
الملخصThis paper presents a new advanced methodology for designing high resolution time-frequency distributions (TFDs) of multicomponent nonstationary signals that can be approximated using piece-wise linear frequency modulated (PW-LFM) signals. Most previous kernel design methods assumed that signals auto-Terms are mostly centered around the origin of the nu ambiguity domain while signal cross-Terms are mostly away from the origin. This study uses a multicomponent test signal for which each component is modeled as a PW-LFM signal; it finds that the above assumption is a very rough approximation of the location of the auto-Terms energy and cross-Terms energy in the ambiguity domain and it is only valid for signals that are well separated in the (t,f) domain. A refined investigation led to improved specifications for separating cross-Terms from auto-Terms in the nu ambiguity domain. The resulting approach first represents the signal in the ambiguity domain, and then applies a multidirectional signal dependent compact kernel that accounts for the direction of the auto-Terms energy. The resulting multidirectional distribution (MDD) approach proves to be more effective than classical methods like extended modified B distribution, S-method, or compact kernel distribution in terms of auto-Terms resolution and cross-Terms suppression. Results on simulated and real data validate the improved performance of the MDD, showing up to 8% gain as compared to more standard state-of-The-Art TFDs.
راعي المشروعThis work was supported by the QNRF under Grants NPRP 4-1303-2-517, NPRP 6-680-2-282, and NPRP 6-885-2-364
اللغةen
الناشرInstitute of Electrical and Electronics Engineers Inc.
الموضوعambiguity domain
compact kernel
compact kernel distribution (CKD)
cross-Term reduction
multi-directional kernel
piece-wise LFM
quadratic TFDs
Time-frequency distribution
العنوانAn Improved Design of High-Resolution Quadratic Time-Frequency Distributions for the Analysis of Nonstationary Multicomponent Signals Using Directional Compact Kernels
النوعArticle
الصفحات2701-2713
رقم العدد10
رقم المجلد65
dc.accessType Abstract Only


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