| Presentation | 2009-01-23 Primary User Detection with Distributed Spectrum Sensors over Rayleigh Fading Channel Chen SUN, Yohannes D. ALEMSEGED, HaNguyen TRAN, Hiroshi HARADA, |
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| Abstract(in English) | 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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| Paper # | SR2008-86 |
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| Committee | SR |
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| Conference Date | 2009/1/15(1days) |
| Place (in Japanese) | (See Japanese page) |
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| Registration To | Software Radio(SR) |
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| Language | ENG |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Primary User Detection with Distributed Spectrum Sensors over Rayleigh Fading Channel |
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| 1st Author's Name | Chen SUN |
| 1st Author's Affiliation | New Generation Wireless Communications Research Center National Institute of Information and Communications Technology (NICT)() |
| 2nd Author's Name | Yohannes D. ALEMSEGED |
| 2nd Author's Affiliation | New Generation Wireless Communications Research Center National Institute of Information and Communications Technology (NICT) |
| 3rd Author's Name | HaNguyen TRAN |
| 3rd Author's Affiliation | New Generation Wireless Communications Research Center National Institute of Information and Communications Technology (NICT) |
| 4th Author's Name | Hiroshi HARADA |
| 4th Author's Affiliation | New Generation Wireless Communications Research Center National Institute of Information and Communications Technology (NICT) |
| Date | 2009-01-23 |
| Paper # | SR2008-86 |
| Volume (vol) | vol.108 |
| Number (no) | 400 |
| Page | pp.pp.- |
| #Pages | 7 |
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