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| 講演名 | 2009-01-23 16:10 Primary User Detection with Distributed Spectrum Sensors over Rayleigh Fading Channel ○Chen Sun・Yohannes D. Alemseged・Ha Nguyen Tran・Hiroshi Harada（NICT）  SR2008-86 |
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| 抄録 | （和） | This study addresses detection of primary users (PUs) for cognitive radio system (CRS) with distributed spectrum sensors (DSSs) in Rayleigh fading environment. Three sensing schemes using DSSs that employ energy detection (ED) are investigated as cooperative sensing, collaborative sensing and selective sensing. For the cooperative sensing, each DSS makes hard decision after sensing and transmits these information by on-off keying (OOK) singling to a secondary user (SU) that performs data fusion. In terms of collaborative sensing, multiple DSSs exchange the hard decision information after sensing and make data fusion at a selected DSS. Then, the selected DSS transmits the decision information to the SU with OOK signaling. As for the selective sensing, sensing information from multiple sensors is selected. And, one sensor is chosen to send this selected sensing information to the SU. In this paper, a closed-form expression for the probability of detection by ED with selective combining (SC) in Rayleigh fading environment is derived. The expression includes probability of detection in Rayleigh fading as a special case and extends to the situation with L branch SC. Applying this expression to the PU detection problem, analytical models for evaluating the three sensing schemes are obtained. Results show that at 5-dB signal-to-noise ratio (SNR) and using 3 DSSs, the probability of PU detection is increased from 0.02 to 0.3 and 0.4 by collaborative sensing and collaborative sensing, respectively. Results also show that selected sensing achieves comparable performance of collaborative sensing but it provides a lower false alarm rate. |
| （英） | This study addresses detection of primary users (PUs) for cognitive radio system (CRS) with distributed spectrum sensors (DSSs) in Rayleigh fading environment. Three sensing schemes using DSSs that employ energy detection (ED) are investigated as cooperative sensing, collaborative sensing and selective sensing. For the cooperative sensing, each DSS makes hard decision after sensing and transmits these information by on-off keying (OOK) singling to a secondary user (SU) that performs data fusion. In terms of collaborative sensing, multiple DSSs exchange the hard decision information after sensing and make data fusion at a selected DSS. Then, the selected DSS transmits the decision information to the SU with OOK signaling. As for the selective sensing, sensing information from multiple sensors is selected. And, one sensor is chosen to send this selected sensing information to the SU. In this paper, a closed-form expression for the probability of detection by ED with selective combining (SC) in Rayleigh fading environment is derived. The expression includes probability of detection in Rayleigh fading as a special case and extends to the situation with L branch SC. Applying this expression to the PU detection problem, analytical models for evaluating the three sensing schemes are obtained. Results show that at 5-dB signal-to-noise ratio (SNR) and using 3 DSSs, the probability of PU detection is increased from 0.02 to 0.3 and 0.4 by collaborative sensing and collaborative sensing, respectively. Results also show that selected sensing achieves comparable performance of collaborative sensing but it provides a lower false alarm rate. |
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| キーワード | （和） | cognitive radio / spectrum sensing / cooperative sensing / collaborative sensing / selective sensing / / / |
| （英） | cognitive radio / spectrum sensing / cooperative sensing / collaborative sensing / selective sensing / / / | |
| 文献情報 | 信学技報, vol. 108, no. 400, SR2008-86, pp. 111-117, 2009年1月. | |
| 資料番号 | SR2008-86 | |
| 発行日 | 2009-01-15 (SR) | |
| ISSN | Print edition: ISSN 0913-5685 Online edition: ISSN 2432-6380 | |
| 著作権に ついて |
技術研究報告に掲載された論文の著作権は電子情報通信学会に帰属します．(許諾番号：10GA0019/12GB0052/13GB0056/17GB0034/18GB0034) | |
| PDFダウンロード | SR2008-86 |
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