Alnwaimi, Ghassan, Arshad, Kamran and Moessner, Klaus (2009) Collaborative spectrum sensing in OFDM-based cognitive radio. In: Proceedings 2009 First UK-India International Workshop on Cognitive Wireless Systems (UKIWCWS). Institution of Electrical and Electronics Engineers, Inc., Piscataway, NJ, USA. ISBN 9781457701825 (doi:10.1109/UKIWCWS.2009.5749395)

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Abstract

The rapid increase in the number of wireless devices highlights the importance of intensive dynamic use of the available spectrum. One technology to implement dynamic spectrum access is Cognitive Radio (CR). One of the main challenges CR is gaining spectrum awareness, thus being able to undertake reliable and sufficiently sensitive spectrum sensing. In this paper, an OFDM-based CR system exploiting the inherent cyclic prefix (CP) and idle period of the transmission signals is proposed, assuming a realistic fading channel. Furthermore, collaborative spectrum sensing has been studied based on the proposed methodology, in the presence of Rayleigh fading and log-normal distributed shadowing. The simulation results indicate that the probability of detection can be significantly improved while maintaining the level of interference protection to the primary users by including the CP and idle period in the sensing time in both slow and fast fading channels. Moreover, collaboration of multiple secondary users improves the sensitivity of the sensing algorithm in terms of minimum detectable SNR. The analyses provided in this paper show that collaboration among 10 users facilitates detection at lower SNR levels up to -10 dB with 0.9 probability of correct detection and 0.1 probability of false alarm.

Item Type:	Conference Proceedings
Title of Proceedings:	Proceedings 2009 First UK-India International Workshop on Cognitive Wireless Systems (UKIWCWS)
Additional Information:	[1] This paper was first presented at the 2009 First UK-India International Workshop on Cognitive Wireless Systems (UKIWCWS 2009) held from 10-12 December 2009 in New Delhi, India. [2] ISBN: 9781457701825; 9781457701832
Uncontrolled Keywords:	OFDM modulation, Rayleigh channels, cognitive radio, log normal distribution, OFDM-based cognitive radio, Rayleigh fading, SNR, collaborative spectrum sensing, correct detection, cyclic prefix, dynamic spectrum access, fading channel, fast fading channels, interference protection, log-normal distributed shadowing, slow fading channels, transmission signals, collaboration, fading, monitoring, OFDM, sensors, shadow mapping, signal to noise ratio
Subjects:	T Technology > TK Electrical engineering. Electronics Nuclear engineering
Pre-2014 Departments:	School of Engineering School of Engineering > Mobile & Wireless Communications Research Laboratory
Related URLs:	Publisher Publisher Organisation
Last Modified:	14 Oct 2016 09:27
URI:	http://gala.gre.ac.uk/id/eprint/11294

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