Journal
IEEE ACCESS
Volume 9, Issue -, Pages 30060-30070Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/ACCESS.2021.3053957
Keywords
Sensors; Time-frequency analysis; Compressed sensing; Baseband; Receivers; Detectors; Cognitive radio; Cognitive radio; compressed sensing; sub-Nyquist; energy detector; spectrum
Categories
Funding
- National Science Foundation [1920468]
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [1920468] Funding Source: National Science Foundation
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Compressed sensing is considered an effective method for detecting sparse spectrum in cognitive radio systems, offering reduced sensing time and hardware overhead compared to traditional spectrum scanners. While multi-channel spectrum scanners generally outperform CS scanners, they are comparable at high signal-to-noise ratios. The advantage of spectrum scanners lies in their more reliable sensing for each frequency bin.
In cognitive radio (CR) systems, compressed sensing (CS) has emerged as a promising approach for detecting wireless spectrum that is underutilized (i.e., sparse in the frequency domain). The use of CS techniques is believed to reduce the sensing time at minimal hardware overhead compared to the traditional sweeping spectrum scanner, which is a simple energy detector that scans the frequency bins sequentially. Although the sweeping spectrum scanners can be parallelized to reduce the total scanning time, time-multiplexing is still necessary to cover the very large scanning bandwidth. By contrast, the CS spectrum scanner captures the entire spectrum concurrently to detect the occupied frequency bins. Despite the recent popularity of CS spectrum sensing techniques, no published work is available that rigorously compares the performance of these two sensing schemes under similar hardware constraints and same available total sensing time. This paper makes such a comparison and shows that the multi-channel sweeping spectrum scanner outperforms the CS scanner except at the high input signal-to-noise ratios when the two scanners become comparable. The advantage of the sweeping scanner is that although it observes each frequency bin for a shorter time, each sensing is more reliable and not corrupted by the folding of other frequency bins as in the CS scanner.
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