| 講演名 | 2007-11-26 Cognitive Interference Mitigation Techniques for Pulsed-Multiband DS-UWB System , |
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| 抄録(英) | This paper investigates the achievable performance improvement employing a cognitive interference-mitigation technique for a pulsed-multiband (MB) ultra wideband (UWB) system. To obtain further processing gain, direct sequence (DS) spreading is included. The theoretical framework of the DS-MB-UWB multiple access system employing cognitive interference-detection and mitigation is constructed over multipath environment in the presence of a coexisting narrowband wireless system. It is found that by suppressing the power of the particular sub-band affected by a spectrally coexisting narrowband signal, the impact of the narrowband interference can be mitigated. As a typical result, by suppressing 75% of the affected sub-band, bit error rate (BER) in the order of 10 fold can be decreased. In the hybrid DS-MB-UWB system, increasing the number of sub-bands is found to achieve more improvement than increasing the number of DS chips. In this case, a total processing gain improvement of 20 can be achieved at the same BER. Additionally, the bandwidth and spectral location of the narrowband interference is also found to have great impact on the UWB system performance. Narrowband signal with bandwidth of 60 times narrower or below than the UWB sub-band is observed to have less significant impact. On the other hand, simultaneous to the reduction of narrowband interference, multiple access interference (MAI) and multipath interference (MI) are found to increase as a result of sub-band power suppression. This paper attempts to propose a cognitive mitigation technology that is able to achieve optimum performance while maintaining the frequency diversity by using the developed framework. |
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| キーワード(英) | Cognitive interference mitigation / multiband / DS-UWB / multiple access / narrowband interference |
| 資料番号 | SR2007-46 |
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| 研究会 | SR |
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| 開催期間 | 2007/11/19(から1日開催) |
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| 申込み研究会 | Software Radio(SR) |
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| 本文の言語 | ENG |
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| タイトル（英） | Cognitive Interference Mitigation Techniques for Pulsed-Multiband DS-UWB System |
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| キーワード(1)（和/英） | / Cognitive interference mitigation |
| 第 1 著者 氏名（和/英） | / Chin-Sean SUM |
| 第 1 著者 所属（和/英） | National Institute of Information and Communications Technology (NICT) |
| 発表年月日 | 2007-11-26 |
| 資料番号 | SR2007-46 |
| 巻番号（vol） | vol.107 |
| 号番号（no） | 352 |
| ページ範囲 | pp.- |
| ページ数 | 7 |
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