2015/07/03 by Zeinab Zeinalkhani, Amir H. Banihashemi, Zeinalkhani, Zeinab +1
Computer Science · Engineering · Mathematics · Medicine · #Blind Source Separation Techniques #ECG Monitoring and Analysis #FOS: Computer and information sciences #Information Theory (cs.IT) #Sparse and Compressive Sensing Techniques #cs.IT #math.IT
paper · pdf · doi:10.48550/arxiv.1507.00993
7 pages, 5 figures
arxiv created 2015/07/03 · openalex publication_date 2015/07/03 · arxiv updated 2015/07/06 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Wideband spectrum sensing is a significant challenge in cognitive radios (CRs) due to requiring very high-speed analog- to-digital converters (ADCs), operating at or above the Nyquist rate. Here, we propose a very low-complexity zero-block detection scheme that can detect a large fraction of spectrum holes from the sub-Nyquist samples, even when the undersampling ratio is very small. The scheme is based on a block sparse sensing matrix, which is implemented through the design of a novel analog-to- information converter (AIC). The proposed scheme identifies some measurements as being zero and then verifies the sub-channels associated with them as being vacant. Analytical and simulation results are presented that demonstrate the effectiveness of the proposed method in reliable detection of spectrum holes with complexity much lower than existing schemes. This work also introduces a new paradigm in compressed sensing where one is interested in reliable detection of (some of the) zero blocks rather than the recovery of the whole block sparse signal.