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Open AccessArticle

Wideband Spectrum Sensing Based on Reconfigurable Filter Bank in Cognitive Radio

by Huan Wang 1,2,*, Bin Wu 2, Yuancheng Yao 2 and Mingwei Qin 2
1
Institute of Electronic Engineering, China Academy of Engineering Physics, Mianyang 621900, China
2
School of Information Engineering, Southwest University of Science and Technology, Mianyang 621010, China
*
Author to whom correspondence should be addressed.
Future Internet 2019, 11(11), 244; https://doi.org/10.3390/fi11110244
Received: 11 October 2019 / Revised: 31 October 2019 / Accepted: 16 November 2019 / Published: 18 November 2019
In order to ease the conflict between the bandwidth demand of high-rate wireless communication and the shortage of spectrum resources, a wideband spectrum sensing method based on reconfigurable filter bank (RFB) with adjustable resolution is presented. The wideband signals are uniformly divided into multi-narrowband signals by RFB, which is designed by polyphase uniform Discrete Fourier Transform (DFT) modulation, and each sub-band is sensed by energy detection. According to the idle proportion of detected sub-bands, the number of RFB sub-bands is reset in next spectrum-sensing time. By simulating with collected wideband dataset, the influence of filter bank sub-bands number and idle state proportion on the sensing results is analyzed, and then on the basis of the trade-off between spectrum-sensing resolution and computational complexity, the optimal sub-bands number of filter bank is selected, so as to improve the detection performance and save resources. View Full-Text
Keywords: reconfigurable filter bank; adjustable resolution; energy detection; wideband spectrum-sensing reconfigurable filter bank; adjustable resolution; energy detection; wideband spectrum-sensing
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Wang, H.; Wu, B.; Yao, Y.; Qin, M. Wideband Spectrum Sensing Based on Reconfigurable Filter Bank in Cognitive Radio. Future Internet 2019, 11, 244.

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