Multirate asynchronous sampling of sparse multiband signals
| Autor: | Amir Rosenthal, Moshe Horowitz, Alex Linden |
|---|---|
| Rok vydání: | 2008 |
| Předmět: |
Signal processing
Computer science Signal reconstruction business.industry Bandwidth (signal processing) FOS: Physical sciences Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Optics Analog signal Undersampling Robustness (computer science) Oversampling Computer Vision and Pattern Recognition Nyquist rate business Algorithm Optics (physics.optics) Physics - Optics |
| Zdroj: | Journal of the Optical Society of America. A, Optics, image science, and vision. 25(9) |
| ISSN: | 1084-7529 |
| Popis: | Because optical systems have huge bandwidth and are capable of generating low noise short pulses they are ideal for undersampling multi-band signals that are located within a very broad frequency range. In this paper we propose a new scheme for reconstructing multi-band signals that occupy a small part of a given broad frequency range under the constraint of a small number of sampling channels. The scheme, which we call multi-rate sampling (MRS), entails gathering samples at several different rates whose sum is significantly lower than the Nyquist sampling rate. The number of channels does not depend on any characteristics of a signal. In order to be implemented with simplified hardware, the reconstruction method does not rely on the synchronization between different sampling channels. Also, because the method does not solve a system of linear equations, it avoids one source of lack of robustness of previously published undersampling schemes. Our simulations indicate that our MRS scheme is robust both to different signal types and to relatively high noise levels. The scheme can be implemented easily with optical sampling systems. 16 pages 7 figures |
| Databáze: | OpenAIRE |
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