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공과대학
전자전기공학전공
Journal papers
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Cognitive radio based bandwidth sharing among heterogeneous OFDM access systems
Title
Cognitive radio based bandwidth sharing among heterogeneous OFDM access systems
Authors
Kim M.-R.
;
Kim E.-J.
;
Kang Y.-J.
;
Kim N.-M.
Ewha Authors
김낙명
SCOPUS Author ID
김낙명
Issue Date
2007
Journal Title
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
ISSN
0302-9743
Citation
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) vol. 4517 LNCS, pp. 358 - 369
Indexed
SCOPUS
Document Type
Conference Paper
Abstract
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.
ISBN
9783540726944
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