Journal of information and communication convergence engineering

The Korea Institute of Information and Commucation Engineering (한국정보통신학회)
권호 표지
DOI QR코드

DOI QR Code

A Cooperative Spectrum Sensing Scheme with an Adaptive Energy Threshold in Cognitive Radios

  • Van, Hiep-Vu (School of Electrical Engineering, University of Ulsan) ;
  • Koo, In-Soo (School of Electrical Engineering, University of Ulsan)
  • Received : 2011.06.11
  • Accepted : 2011.07.29
  • Published : 2011.08.31
Download PDF
⟨ Previous Next ⟩

Abstract

Cognitive radio (CR) technique is a useful tool for improving spectrum utilization by detecting and using the vacant frequency bands while avoiding interference to the primary user. The sensing performance in a CR network can be improved by allowing some CR users to perform cooperative spectrum sensing. In this paper, we propose a new sensing algorithm that utilizes an adaptive energy threshold for cooperative spectrum sensing in which a changeable energy threshold is adopted by the CR users for improving local sensing performance. Through the proposed scheme, the reliability of global decision can be enhanced mainly due to the improvement in local sensing performance.

Keywords

References

  1. Y. Hur, J. Park, W. Woo, K. Lim, C.-H. Lee, H. S. Kim and J. Laskar, "A wideband analog multi-resolution spectrum sensing (MRSS) technique for cognitive radio (CR) systems," Proc. IEEE Int. Symp. Circuit and System, Greece, pp.4090-4093, 2006.
  2. A. Sahai, N. Hoven and R. Tandra, "Some fundamental limits on cognitive radio," Proc. Allerton Conf. on Communications, control, and computing, Monticello, 2004.
  3. S.M. Mishra, A. Sahai, and R. Brodersen, "Cooperative sensing among cognitive radios", ICC 2006, pp.1658-1663, 2006.
  4. D. Cabric, S. M. Mishra and R. W. Brodersen, "Implementationissues in spectrum sensing for cognitive radios," Proc. of Asilomar Conf. on Signals, Systems and Computers, USA, pp. 772-776, 2004.
  5. Z. Chair and P. K. Varshney, "Optimal data fusion in multiple sensor detection systems," IEEE Trans. Aerospace Electron. Syst., pp.98-101, 1986.
  6. F. F. Digham, M.-S. Alouini and M. K. Simon, "Onthe energy detection of unknown signals over fading channels," Proc. IEEE Int. Conf. Commun., USA, pp. 3575-3579, 2003.