Cognitive radio system with carrier sense assisted by cellular system (無線通信システム)
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概要
- 論文の詳細を見る
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 relays 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.
- 社団法人電子情報通信学会の論文
- 2007-08-16
著者
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Fujii Takeo
Advanced Wireless Communication Research Center The University Of Electro-communications Japan
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Fujii Takeo
Advance Wireless Communication Research Center (awcc) University Of Electro-communications
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FUJII Takeo
The University of Electro-Communications
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Haruyama Shinichiro
The University Of Electro-communications
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PROMPIJIT Anwida
Keio University
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NAKAGAWA Masao
The University of Electro-Communications
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Fujii Takeo
The University Of Electromagnetic Communication
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Fujii Takeo
Univ. Electro‐communications Chofu‐shi Jpn
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