Wideband Spectrum Sensing in Cognitive Radio Networks by Using Improved Energy Detector
Subject Areas : electrical and computer engineeringY. Eghbali 1 , M. Ahmadian Attari 2 , H. Hassani 3
1 - K.N. Toosi University of Technology
2 - K.N. Toosi University of Technology
3 - K.N. Toosi University of Technology
Keywords: Improved energy detector joint detection wideband sensing cognitive radio,
Abstract :
In cognitive radio networks, spectrum sensing is of a great importance in determining spectrum holes. In this paper, the impact of improved energy detector on the wideband spectrum sensing is considered for accurate detection of spectrum holes. For this end, wideband spectrum is sub channelized into equal non-overlapping sub-bands. Our main concern is to find the thresholds of the individual sub-bands simultaneously. By formulating the spectrum sensing problem, in terms of convex optimization one, we seek for maximizing the opportunistic aggregate throughput of cognitive users. In numerical simulation section, it is illustrated that using improved energy detector, the opportunistic aggregate throughput is improved significantly.
[1] A. Sahai and D. Cabric, "A tutorial on spectrum sensing: fundamental limits and practical challenges," in Proc. IEEE Symp. New Frontiers Dynamic Spectrum Access Networks, DySPAN, Baltimore, MD, US, Nov. 2005.
[2] D. Cabric, S. M. Mishra, and R. W. Brodersen, "Implementation issues in spectrum sensing for cognitive radios," in 38th Asilomar Conf. on Signals, Systems, and Computers, vol. 1, pp. 772-776, Nov. 2004.
[3] M. Ghozzi, M. Dohler, F. Marx, and J. Palico, "Cognitive radios: methods for the detection of free bands," Elsevier Science J., vol. 7, pp. 794-805, Sep. 2006.
[4] Y. Chen, "Improved energy detector for random signals in Gaussian noise," Wireless Communications, IEEE Trans. on, vol. 9, no. 2, pp. 558-563, Feb. 2010.
[5] Z. Quan, S. Cui, A. H. Sayed, and H. V. Poor, "Optimal multiband joint detection for spectrum sensing in cognitive radio networks," Signal Processing, IEEE Trans. on, vol. 57, no. 3, pp. 1128-1140, Mar. 2009.
[6] K. Hossain and B. Champange, "Wideband spectrum sensing for cognitive radios with correlated subband occupancy," IEEE Signal Processing Letters, vol. 18, no. 1, pp. 35-38, Jan. 2011.
[7] P. Paysarvi-Hoseini and N. C. Beaulieu, "Optimal wideband spectrum sensing framework for cognitive radio systems," Signal Processing, IEEE Trans. on, vol. 59, no. 3, pp. 1170-1182, Mar. 2011.
[8] A. Goldsmith, Wireless Communications, Cambridge, U. K.: Cambridge Univ. Press, 2006.
[9] Initial Evaluation of the Performance of Prototype TV-Band White Space Devices, FCC/OET 07-TR-1006, Jul. 2007.
[10] Z. Quan, S. Cui, and A. H. Sayed, "Optimal linear cooperation for spectrum sensing in cognitive radio networks," Selected Topics in Signal Processing, IEEE J. of, vol. 2, no. 1, pp. 28-40, Feb. 2008.
