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

Kwon, Yang-Soo (인하대학교 전자공학과 무선이동통신 연구실)
Yoo, Jae-Ho (인하대학교 전자공학과 무선이동통신 연구실)
Lee, Il-Shin (인하대학교 전자공학과 무선이동통신 연구실)
Chung, Jae-Hak (인하대학교 전자공학과 무선이동통신 연구실)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.33, no.11A, 2008 , pp. 1013-1020 More about this Journal
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/Hz, the sum-rate capacity at 20 cognitive users in an area with two antennas at the cognitive radio basestation.
Keywords
Cognitive radio; Co-existence; Sum-rate; Orthogonal beamforming; Orthogonalization;
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Times Cited By KSCI : 3  (Citation Analysis)
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