A Study on Cognitive Radio Coexisting with Cellular Systems
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概要
- 論文の詳細を見る
Cognitive Radios (CRs) are expected to perform more significant role in the view of efficient utilization of the spectrum resources in the future wireless communication networks. In this paper, a cognitive radio coexisting with cellular systems is proposed. In the case that a cellular system adopts Frequency Division Duplex (FDD) as a multiplexing scheme, the proposed CR terminals communicate in local area on uplink channels of the cellular system with transmission powers that dont interfere with base stations of the cellular system. Alternatively, in the case that a cellular system adopts Time Division Duplex (TDD), the CR terminals communicate on uplink slots of the cellular system. However if mobile terminals in the cellular system are near the CR network, uplink signals from the mobile terminals may interfere with the CR communications. In order to avoid interference from the mobile terminals, the CR terminal performs carrier sense during a beginning part of uplink slot, and only when the level of detected signal is below a threshold, then the CR terminal transmits a signal during the remained period of the uplink slot. In this paper, both the single carrier CR network that uses one frequency channel of the cellular system and the multicarrier CR network that uses multiple frequency channels of the cellular system are considered. The probabilities of successful CR communications, the average throughputs of the CR communications according to the positions of the CR network, and the interference levels from cognitive radio network to base stations of the cellular system are evaluated in the computer simulation then the effectiveness of the proposed network is clarified.
- （社）電子情報通信学会の論文
- 2008-01-01
著者
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TOMIOKA Tazuko
Corporate Research & Development Center, Toshiba Corp.
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Tomizawa Takeshi
Corporate Research & Development Center Toshiba Corporation
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Tomioka Tazuko
Toshiba Corp. Kawasaki‐shi Jpn
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Tomioka Tazuko
Corporate R&d Center Toshiba Corp.
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TANDAI Tomoya
Corporate Research & Development Center, Toshiba Corporation
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Tandai Tomoya
Corporate Research & Development Center Toshiba Corporation
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HORIGUCHI Tomoya
Corporate R&D Center, Toshiba Corp.
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DEGUCHI Noritaka
Corporate Research & Development Center, Toshiba Corporation
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Horiguchi Tomoya
Corporate Research & Development Center Toshiba Corporation
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Deguchi Noritaka
Corporate Research & Development Center Toshiba Corporation
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Deguchi Noritaka
Corporate R&d Center Toshiba Corp.
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