Spectrum Co-existence Method using Orthogonal Beamforming in Cognitive Radio Systems 


Vol. 33,  No. 11, pp. 1013-1020, Nov.  2008


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  Abstract

Cognitive radio(CR) techniques have been considered as a strong solution of frequency scarcity due to the limitation of frequency resource, In this paper, an orthogonal beamforming method is proposed that enables cognitive radio systems to coexist with a primary users' system in the same spectrum and region without causing interference to primary systems. The orthogonal multiple beams for multi-users of CR systems are obtained through the generation of orthogonal subspaces from primary users' channel state information. To increase the sum-rate of the CR systems, the proposed scheme adopts opportunistic radio resource allocation techniques. Simulation results provides that the proposed scheme achieves 2.72bps/㎐, the sum-rate capacity at 20 cognitive users in an area with two antennas at the cognitive radio basestation.

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  Cite this article

[IEEE Style]

Y. Kwon, J. Yoo, I. Lee, J. Chung, "Spectrum Co-existence Method using Orthogonal Beamforming in Cognitive Radio Systems," The Journal of Korean Institute of Communications and Information Sciences, vol. 33, no. 11, pp. 1013-1020, 2008. DOI: .

[ACM Style]

Yangsoo Kwon, Jaeho Yoo, Ilshin Lee, and Jaehak Chung. 2008. Spectrum Co-existence Method using Orthogonal Beamforming in Cognitive Radio Systems. The Journal of Korean Institute of Communications and Information Sciences, 33, 11, (2008), 1013-1020. DOI: .

[KICS Style]

Yangsoo Kwon, Jaeho Yoo, Ilshin Lee, Jaehak Chung, "Spectrum Co-existence Method using Orthogonal Beamforming in Cognitive Radio Systems," The Journal of Korean Institute of Communications and Information Sciences, vol. 33, no. 11, pp. 1013-1020, 11. 2008.

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pISSN : 1226 - 4717
eISSN : 2287 - 3880