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서지반출
Enhanced Adaptive Beamforming and Null Steering Algorithms in Cognitive Radio System
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  • Enhanced Adaptive Beamforming and Null Steering Algorithms in Cognitive Radio System
  • Enhanced Adaptive Beamforming and Null Steering Algorithms in Cognitive Radio System
저자명
장치리,손성환,김재명,Zhuang. Zhili,Sohn. Sung-Hwan,Kim. Jae-Moung
간행물명
한국통신학회논문지. The journal of Korea Information and Communications Society. 무선통신
권/호정보
2009년|34권 |pp.822-830 (9 pages)
발행정보
한국통신학회
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정기간행물|ENG|
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이 논문은 한국과학기술정보연구원과 논문 연계를 통해 무료로 제공되는 원문입니다.
서지반출

기타언어초록

The spectrum efficiency of mobile communication networks can be improved dramatically adopting multiple antennas technologies. In order to guarantee the licensed rights of primary user (PU), the cognitive radio system should perform in a relatively low interference manner when it gets access to the spectrum of licensed networks. In this paper, we explore a uniformly distributed circular antenna array to implement beamforming algorithm that is accomplished by optimization method at the base station of cognitive radio networks, and therefore we can suppress the interference to PU by steering quite low transmission power toward PU and constructing a narrow beam toward cognitive user (CU). By reducing the constraint number of the optimization problem, we also propose a null steering algorithm that steers rather low radiation power toward PU, while the other areas in the same cell are covered by radiation power except the local area around PU. It is pursued to reduce the computation load and enlarge the capacity of cognitive radio networks extremely. The simulation results demonstrate that the proposed algorithms process superior performance.