지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2009.11
- 수록면
- 822 - 830 (9page)
이용수
초록· 키워드
오류제보하기
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.
목차
ABSTRACT
Ⅰ. Introduction
Ⅱ. System Description
Ⅲ. The Proposed Algorithms and Solutions
Ⅳ. Simulation Results
Ⅴ. Conclusion
References
참고문헌 (10)
참고문헌 신청
1. [학술지(정기간행물)] - Ian F. Akyildiza / 2006 / NeXt Genergation/ dynamic spectrum/cognitive radio wireless networks: A survey / Computer Networks 50 : 2127 ~ 2159
2. [학술대회논문] - Ye Zhuan / 2007 / Spectrum Sensing using Cyclostationary Spectrum Density for Cognitive Radios / Signal Processing Systems, 2007 IEEE Workshop : 1 ~ 6
3. [학술지(정기간행물)] - Zoran Kostic / 2001 / Fundamentals of dynamic frequency hopping in cellular systems / Slected Areas in Communications, IEEE Journal 19 (11) : 2254 ~ 2266
4. [학술대회논문] - Islam M.R. / 2007 / Adaptive beamforming with 16-element lineear array using MaxSIR and MMSE algorithms / ICT-MICC 2007 : 165 ~ 170
5. [학술대회논문] - Yiu S. / 2008 / Interference Reducction by Beamforming in Cognitive Radio Networks / Global Telecommunication Conference : 1 ~ 6
2. [학술대회논문] - Ye Zhuan / 2007 / Spectrum Sensing using Cyclostationary Spectrum Density for Cognitive Radios / Signal Processing Systems, 2007 IEEE Workshop : 1 ~ 6
3. [학술지(정기간행물)] - Zoran Kostic / 2001 / Fundamentals of dynamic frequency hopping in cellular systems / Slected Areas in Communications, IEEE Journal 19 (11) : 2254 ~ 2266
4. [학술대회논문] - Islam M.R. / 2007 / Adaptive beamforming with 16-element lineear array using MaxSIR and MMSE algorithms / ICT-MICC 2007 : 165 ~ 170
5. [학술대회논문] - Yiu S. / 2008 / Interference Reducction by Beamforming in Cognitive Radio Networks / Global Telecommunication Conference : 1 ~ 6
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