CaSCADE: Compressed Carrier and DOA Estimation
| Autor: | Deborah Cohen, Shahar Stein Ioushua, Or Yair, Yonina C. Eldar |
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| Rok vydání: | 2016 |
| Předmět: |
FOS: Computer and information sciences
Signal processing Carrier signal Signal reconstruction Computer science Computer Science - Information Theory Information Theory (cs.IT) 020208 electrical & electronic engineering Sampling (statistics) Direction of arrival 020206 networking & telecommunications 02 engineering and technology Signal Compressed sensing Narrowband Sampling (signal processing) Signal Processing 0202 electrical engineering electronic engineering information engineering Nyquist rate Electrical and Electronic Engineering Wideband Algorithm |
| Zdroj: | IEEE Transactions on Signal Processing |
| DOI: | 10.48550/arxiv.1604.02723 |
| Popis: | Spectrum sensing and direction of arrival (DOA) estimation have been thoroughly investigated, both separately and as a joint task. Estimating the support of a set of signals and their DOAs is crucial to many signal processing applications, such as Cognitive Radio (CR). A challenging scenario, faced by CRs, is that of multiband signals, composed of several narrowband transmissions spread over a wide spectrum each with unknown carrier frequencies and DOAs. The Nyquist rate of such signals is high and constitutes a bottleneck both in the analog and digital domains. To alleviate the sampling rate issue, several sub-Nyquist sampling methods, such as multicoset sampling or the modulated wideband converter (MWC), have been proposed in the context of spectrum sensing. In this work, we first suggest an alternative sub-Nyquist sampling and signal reconstruction method to the MWC, based on a uniform linear array (ULA). We then extend our approach to joint spectrum sensing and DOA estimation and propose the CompreSsed CArrier and DOA Estimation (CaSCADE) system, composed of an L-shaped array with two ULAs. In both cases, we derive perfect recovery conditions of the signal parameters (carrier frequencies and DOAs if relevant) and the signal itself and provide two reconstruction algorithms, one based on the ESPRIT method and the second on compressed sensing techniques. Both our joint carriers and DOAs recovery algorithms overcome the well-known pairing issue between the two parameters. Simulations demonstrate that our alternative spectrum sensing system outperforms the MWC in terms of recovery error and design complexity and show joint carrier frequencies and DOAs from our CaSCADE system's sub-Nyquist samples. |
| Databáze: | OpenAIRE |
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