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http://dx.doi.org/10.7840/kics.2013.38B.10.843

An Active Interference Management Scheme for Cognitive Radio Systems  

Seo, Jongpil (인하대학교 전자공학과)
Yang, Chamsol (인하대학교 전자공학과)
Park, Gunwoo (인하대학교 전자공학과)
Chung, Jaehak (인하대학교 전자공학과)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.38B, no.10, 2013 , pp. 843-850 More about this Journal
Abstract
Cognitive radio systems have been considered as a strong solution of frequency scarcity due to the limit of frequency resources. This paper proposed an active interference management scheme that the secondary system can coexist with the primary system in the same frequency band without interference. Using the proposed protocol, the secondary user acquires interference channel information and transmit/receive filter information and designs precoding matrix using these information. Since interference from the secondary systems are collected to unused subchannels of the primary system, the primary system can suppress interference without additional process. The secondary systems suppress interference from the primary system using whitening matched filter so that the spectral efficiency can be improved. Numerical results provides that the proposed scheme improves performance of the secondary systems without interference to the primary system and do not degrade performance of the primary system even if the number of the secondary systems increases.
Keywords
cognitive radio; interference management; uplink system;
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  • Reference
1 FCC, Spectrum policy task force report, ET Docket No. 02-155, Nov. 2002.
2 FCC, Notice of Rule Making and Order, ET Docket No. 03-322, Dec. 2003.
3 J. Mitola, "Cognitive radio for flexible mobile multimedia communications," in Proc. IEEE Workshop Mobile Multimedia Commun. (MoMuC '99), pp. 3-10, San Diego, U.S.A., Nov. 1999.
4 IEEE, "IEEE P802.11afTM./D1.02 Draft Standard for Information Technology -Telecommunications and information exchange between systems - Local and metropolitan area networks - Specific requirements - Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications Amendment 3: TV White Spaces OperationU.S.," June 2011.
5 IEEE, "IEEE Std 802.22TM.-2011 IEEE Standard for Information Technology -Telecommunications and information exchange between systems Wireless Regional Area Networks (WRAN) - Specific requirements - Part 22: Cognitive Wireless RAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications: Policies and Procedures for Operation in the TV Bands," July 2011.
6 V. R. Cadambe and S. A, Jafar "Interference alignment and degrees of freedom of the K-user interference channel," IEEE Trans. Inform. Theory, vol. 54, no. 8, pp. 3424-3441, Aug. 2008.
7 3GPP, Coordinated multi-point operation for LTE physical layer aspects, TR 36.819 ver. 11.1.0, Dec. 2011.
8 Y. Kwon, H. Kim, J. Yoo, and J. Chung, "Orthogonal beamforming methodology in cognitive radio networks," in Proc. 3rd Int. Conf. Cognitive Radio Oriented Wireless Networks Commun. (CrownCom 2009), pp. 1-5, Singapore, May 2008.
9 E. Teletar, "Capacity of multi-antenna Gaussian channels," European Trans. Telecommun., vol. 10, no. 6, pp. 585-595, Dec. 1999.   DOI   ScienceOn