Efficient Power Loading in MIMO-OFDM Based Cognitive Radio Networks
Hamid Shahrokh Shahraki, Kamal Mohamed-Pour
.
DOI: 10.4236/cn.2011.31002   PDF    HTML     5,188 Downloads   10,195 Views   Citations

Abstract

Due to their spectrum shaping capability and high adaptability, the multi-carrier systems are considered as prime candidates for use in the Cognitive Radio (CR) networks. In these structures, the deactivation of the primary users’ (PUs) bands makes the secondary users (SUs) use a limited number of sub-carriers, so the total capacity of CR networks is reduced. However, multiple transmit antennas can be applied to OFDM- based CR to compensate for such a low capacity. The present study investigates the problem of power allo-cation in MIMO-OFDM based CR Networks. The objective is maximizing the total capacity of CR systems in the downlink path under both interference on the PUs’ bands and maximum power of the CR transmitter constraints. It is shown that the optimal solution has high computational complexity, and therefore, an effi-cient sub-optimal algorithm is suggested for this application. As simulation results show, the suggested algo-rithm in the present paper is more enhanced and efficient than the previous algorithms.

Share and Cite:

H. Shahraki and K. Mohamed-Pour, "Efficient Power Loading in MIMO-OFDM Based Cognitive Radio Networks," Communications and Network, Vol. 3 No. 1, 2011, pp. 8-16. doi: 10.4236/cn.2011.31002.

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1] Federal Communication Commission, “Spectrum Policy Task Force,” Report of ET Docket 02-135, November 2002.
[2] S. Haykin, “Cognitive Radio: Brain-Empowered Wireless Communications,” IEEE Journal on Selected Areas in Communications, Vol. 23, No. 2, February 2005, pp. 201- 220. doi:10.1109/JSAC.2004.839380
[3] F. Akyildiz, W. Y. Lee, M. C. Vuran and S. Mohanty, “Next Generation/Dynamic Spectrum Access/Cognitive Radio Wireless Networks: A Survey,” Computer Networks, Vol. 50, No. 13, September 2006, pp. 2127-2159. doi:10.1016/j.comnet.2006.05.001
[4] T. A. Weiss and F. K. Jondral, “Spectrum Pooling: An Innovative Strategy for the Enhancement of Spectrum Efficiency,” IEEE communications Magazine, Vol. 43, March 2004, pp. S8-14. doi:10.1109/MCOM.2004.1273 768
[5] R. V. Nee and R. Prasad, “OFDM for Wireless Multimedia Communication,” Artech House, London, 2000.
[6] U. Berthold, F. Jondral, S. Brandes and M. Schnell, “OFDM-Based Overlay Systems: A Promising Approach for Enhancing Spectral Efficiency [Topics in Radio Communications],” IEEE Communications Magazine, Vol. 45, No. 12, December 2007, pp. 52-58. doi:10.1109/ MCOM.2007.4395365
[7] B. Farhang-Boroujeny and R. Kempter, “Multicarrier Communication Techniques for Spectrum Sensing and Communication in Cognitive Radios,” IEEE Communications Magazine, Vol. 46, No. 4, April 2008, pp. 80-85. doi:10.1109/MCOM.2008.4481344
[8] A. J. Paulraj, et al., “An Overview of MIMO Communications—A Key to Gigabit Wireless,” Proceedings of the IEEE, Vol. 92, No. 2, February 2004, pp. 198-218.
[9] D. Gesbert, M. Shafi, D. Shiu, P. J. Smith and A. Naguib, “From Theory to Practice: An Overview of MIMO Space–Time Coded Wireless Systems,” IEEE Journal on Selected Areas in Communications, Vol. 21, No. 3, April 2003, pp. 281-302. doi:10.1109/JSAC.2003.809458
[10] H. Bolcskei and E. Zurich, “MIMO-OFDM Wireless Systems: Basics, Perspectives, and Challenges,” IEEE Wireless Communications, Vol. 13, No. 4, August 2006, pp. 31-37. doi:10.1109/MWC.2006.1678163
[11] W. Zhang, X. G. Xia and K. B. Letaief, “Space- Time/Frequency Coding for MIMO-OFDM in Next Generation Broadband Wireless Systems,” IEEE Wireless Communications, Vol. 14, No. 3, June 2007, pp. 32-43. doi:10.1109/MWC.2007.386610
[12] H. Shahrokh and K. Mohamedpour, “Power Allocation in MIMO-OFDM Based Cognitive Radio Networks,” Accepted for publication in IET Communication Journal, 2010.
[13] D. Tse and P. Viswanath, “Fudamental of Wireless Communication,” Cambridge University Press, Cambridge, 2005.
[14] T. A. Weiss, J. Hillenbrand, A. Krohn and F. K. Jondral, “Mutual Interference in OFDM-Based Spectrum Pooling Systems,” IEEE 59th Vehicular Technology Conference, 2004, pp. 1873-1877.
[15] S. Boyd and L. Vandenberghe, “Convex Optimization,” Cambridge University Press, Cambridge, 2004.

Copyright © 2024 by authors and Scientific Research Publishing Inc.

Creative Commons License

This work and the related PDF file are licensed under a Creative Commons Attribution 4.0 International License.