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Rapid sensing of underutilized, wideband spectrum using the Random Demodulator

Publication ,  Journal Article
Harms, A; Bajwa, WU; Calderbank, R
Published in: Conference Record - Asilomar Conference on Signals, Systems and Computers
December 1, 2012

Efficient spectrum sensing is an important problem given the large and increasing demand for wireless spectrum and the need to protect incumbent users. We can more efficiently use large swaths of underutilized spectrum by designing spectrum sensors that can quickly, and power-efficiently, find and opportunistically communicate over unused (or underutilized) pieces of spectrum, such as television bands. In this paper, we concentrate on a particular sensing architecture, the Random Demodulator (RD), and look at two aspects of the problem. First, we offer fundamental limits on how efficiently any algorithm can perform the sensing operation with the RD. Second, we analyze a very simple, low-complexity algorithm called one-step thresholding that has been shown to work near-optimally for certain measurement classes in a low SNR setting or when the non-zero input coefficients are nearly equal. We rigorously establish that the RD architecture is well-suited for near-optimal recovery of the locations of the non-zero frequency coefficients in similar settings using one-step thresholding and perform numerical experiments to offer some confirmation of our results. © 2012 IEEE.

Duke Scholars

Published In

Conference Record - Asilomar Conference on Signals, Systems and Computers

DOI

ISSN

1058-6393

Publication Date

December 1, 2012

Start / End Page

1940 / 1944
 

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Harms, A., Bajwa, W. U., & Calderbank, R. (2012). Rapid sensing of underutilized, wideband spectrum using the Random Demodulator. Conference Record - Asilomar Conference on Signals, Systems and Computers, 1940–1944. https://doi.org/10.1109/ACSSC.2012.6489377
Harms, A., W. U. Bajwa, and R. Calderbank. “Rapid sensing of underutilized, wideband spectrum using the Random Demodulator.” Conference Record - Asilomar Conference on Signals, Systems and Computers, December 1, 2012, 1940–44. https://doi.org/10.1109/ACSSC.2012.6489377.
Harms A, Bajwa WU, Calderbank R. Rapid sensing of underutilized, wideband spectrum using the Random Demodulator. Conference Record - Asilomar Conference on Signals, Systems and Computers. 2012 Dec 1;1940–4.
Harms, A., et al. “Rapid sensing of underutilized, wideband spectrum using the Random Demodulator.” Conference Record - Asilomar Conference on Signals, Systems and Computers, Dec. 2012, pp. 1940–44. Scopus, doi:10.1109/ACSSC.2012.6489377.
Harms A, Bajwa WU, Calderbank R. Rapid sensing of underutilized, wideband spectrum using the Random Demodulator. Conference Record - Asilomar Conference on Signals, Systems and Computers. 2012 Dec 1;1940–1944.

Published In

Conference Record - Asilomar Conference on Signals, Systems and Computers

DOI

ISSN

1058-6393

Publication Date

December 1, 2012

Start / End Page

1940 / 1944