상세정보
학술대회
Cognitive Radio Based Bandwidth Sharing Among Heterogeneous OFDM Access Systems
- 저자
- 김미란, 김은주, 강연주, 김낙명
- 발행일
- 200705
- 출처
- International Conference on Wired/Wireles Internet Communications (WWIC) 2007 (LNCS 4517), v.4517, pp.358-369
- 협약과제
- 07MM1300, 4세대 이동통신용 적응 무선접속 및 전송 기술개발, 김진업
- 초록
- Cognitive radio (CR) has been proposed as an effective technology for flexible use of the radio spectrum. The interference among primary users and CR users, however, becomes a critical problem when they are operating nearby using adjacent frequency channels with different transmission powers. In this paper, a CR-based bandwidth sharing architecture is proposed, which can effectively suppress adjacent channel interference (ACI) between them. This new approach is characterized by the adaptive frequency spreading, and the adaptive time spreading with power control for the subcarriers near the borders of the CR user's spectrum. The frequency spreading scheme provides with extra power gain against ACI, whereas the time spreading with power control guarantees the minimal interference to primary users from CR users. By computer simulation, it has been proved that the proposed system outperforms the conventional OFDM systems in both throughput and BER performance. © Springer-Verlag Berlin Heidelberg 2007.
- KSP 제안 키워드
- Adjacent Channel Interference, BER performance, Bandwidth Sharing, CR user, Computer simulation(MC and MD), New approach, OFDM systems, Power control(PC), Power gain, Radio Spectrum, Time spreading