Spectral Detection of Frequency-Sparse Signals: Compressed Sensing vs. Sweeping Spectrum Scanning
Spectral Detection of Frequency-Sparse Signals: Compressed Sensing vs. Sweeping Spectrum Scanning
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DOI：
10.1109/access.2021.3053957
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发表时间：
2021
期刊：
影响因子：
3.9
通讯作者：
M. Torlak;W. Namgoong
中科院分区：
文献类型：
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作者：
M. Torlak;W. Namgoong
在认知无线电 (CR) 系统中，压缩感知 (CS) 已成为检测未充分利用的无线频谱（即频域稀疏）的一种有前景的方法。与传统的扫频扫描仪相比，CS 技术的使用被认为可以以最小的硬件开销减少感测时间，传统的扫频扫描仪是一种按顺序扫描频率仓的简单能量检测器。尽管扫频扫描仪可以并行化以减少总扫描时间，但仍然需要时分复用来覆盖非常大的扫描带宽。相比之下，CS 频谱扫描仪同时捕获整个频谱以检测占用的频率段。尽管CS频谱传感技术最近很流行，但还没有发表的工作可以在类似的硬件约束和相同的可用总传感时间下严格比较这两种传感方案的性能。本文进行了这样的比较，结果表明，当两种扫描仪具有可比性时，除了高输入信噪比之外，多通道扫频扫描仪的性能优于 CS 扫描仪。扫频扫描仪的优点在于，虽然它观察每个频率仓的时间较短，但每次感测都更可靠，并且不会像 CS 扫描仪中那样被其他频率仓的折叠所破坏。
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.