Cooperative Wideband Spectrum Sensing over Fading Channels

Sun, Hongjian; Nallanathan, Arumugam; Cui, Shuguang; Wang, Cheng-Xiang

Abstract

In cognitive radio (CR) systems, it is crucial for secondary users to reliably detect spectral opportunities across a wide frequency range. This paper studies a novel multi-rate sub- Nyquist spectrum sensing (MS3) system capable of performing wideband spectrum sensing in a cooperative CR network over fading channels. The aliasing effects of sub-Nyquist sampling are modelled. To mitigate such effects, different sub-Nyquist sampling rates are applied such that the numbers of samples at different CRs are consecutive prime numbers. Moreover, the performance of MS3 over fading channels (Rayleigh fading and log-normal fading) is analysed in the form of bounds on the probabilities of detection and false alarm. The key finding is that the wideband spectrum can be sensed using sub-Nyquist sampling rates in MS3 over fading channels, without the need of spectral recovery. In addition, the aliasing effects can be mitigated by the use of different sub-Nyquist sampling rates in a multi-rate sub-Nyquist sampling system.

Citation

Sun, H., Nallanathan, A., Cui, S., & Wang, C. (2016). Cooperative Wideband Spectrum Sensing over Fading Channels. IEEE Transactions on Vehicular Technology, 65(3), 1382-1394. https://doi.org/10.1109/tvt.2015.2407700

• Journal Article Type: Article
• Acceptance Date: Feb 7, 2015
• Online Publication Date: Feb 28, 2015
• Publication Date: Mar 10, 2016
• Deposit Date: Feb 20, 2015
• Publicly Available Date: Mar 16, 2015
• Journal: IEEE Transactions on Vehicular Technology
• Print ISSN: 0018-9545
• Publisher: Institute of Electrical and Electronics Engineers
• Peer Reviewed: Peer Reviewed
• Volume: 65
• Issue: 3
• Pages: 1382-1394
• DOI: https://doi.org/10.1109/tvt.2015.2407700
• Keywords: Cognitive radio, Rayleigh fading, Log-normal fading, Sub-Nyquist sampling, Wideband spectrum sensing.
• Public URL: https://durham-repository.worktribe.com/output/1414537