Research Article
Frequency Sharing Secondary System with Carrier Sense Assisted by Cellular System
@INPROCEEDINGS{10.1109/CROWNCOM.2008.4562490, author={Anwida PROMPIJIT and Chinnapat SERTTHIN and Masao NAKAGAWA and Takeo FUJII}, title={Frequency Sharing Secondary System with Carrier Sense Assisted by Cellular System}, proceedings={3rd International ICST Conference on Cognitive Radio Oriented Wireless Networks and Communications}, publisher={IEEE}, proceedings_a={CROWNCOM}, year={2008}, month={7}, keywords={Cognitive Radio; Hidden Terminal Problem; Passive and Active Awareness Types}, doi={10.1109/CROWNCOM.2008.4562490} }- Anwida PROMPIJIT
Chinnapat SERTTHIN
Masao NAKAGAWA
Takeo FUJII
Year: 2008
Frequency Sharing Secondary System with Carrier Sense Assisted by Cellular System
CROWNCOM
IEEE
DOI: 10.1109/CROWNCOM.2008.4562490
Abstract
Cognitive radio offers a tempting solution to increase the spectrum usage efficiency by proposing opportunistic usage of frequency bands among licensed users and secondary users. This paper focuses on mitigating the interference that may occur when the secondary user is unaware of the primary user’s active period; known as hidden terminal problem. Path attenuation and shadowing effect are also considered. In this paper, in order to enhance the sensing capability of the cognitive radio system, we propose a cognitive radio system with the combination of active and passive awareness types, by the collaboration of carrier sense and cellular system. Here, we present the simulation results of the system with microwave relay as a primary user and ad hoc cognitive radio terminals as a secondary user. Three different cases are evaluated; the conventional system, the system with carrier sense, and the system with carrier sense assisted by cellular system.