Conference proceeding
Time-frequency localization issues in the context of sparse process modeling
Proceedings of Meetings on Acoustics, Vol.19(1)
ICA 2013 Montreal
06/02/2013
DOI: 10.1121/1.4800709
Abstract
Practical applications in shallow water acoustics such as medium to high frequency acoustic communications often involve non-stationary processes that follow a time-varying sparse support. A classic example is acoustic scatter of transmitted signal due to multiple reflections at the moving ocean surface and sea bottom, which is localized in the time-frequency domain as the sparsely distributed and time-varying Delay-Doppler spread function. In this work, we connect time-frequency localization and modeling of such non-stationary processes with related issues in adaptive sparse sensing. To this end, we provide an overview of methodological advances in adaptive sparse sensing techniques. In particular, we explore the uncertainty principles underlying time-frequency representations in terms of how they influence related and sometimes competing challenges to sparse process modeling. Specifically, we explore the trade-off between: (i) restricted isometry criteria (RIP) for precise sparse reconstruction and (ii) choice of temporal window to localize the non-stationary sparse process. Experimental evidence of our problem framework is provided based on field data collected at 200 meters of range and 15 meters depth under moderate to rough sea conditions.
Details
- Title: Subtitle
- Time-frequency localization issues in the context of sparse process modeling
- Creators
- Ananya Sen Gupta - University of Iowa
- Resource Type
- Conference proceeding
- Publication Details
- Proceedings of Meetings on Acoustics, Vol.19(1)
- Conference
- ICA 2013 Montreal
- DOI
- 10.1121/1.4800709
- ISSN
- 1939-800X
- eISSN
- 1939-800X
- Number of pages
- 6
- Language
- English
- Date published
- 06/02/2013
- Academic Unit
- Electrical and Computer Engineering
- Record Identifier
- 9984197518702771
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