| Presentation | 2007-11-26 Cognitive Interference Mitigation Techniques for Pulsed-Multiband DS-UWB System Chin-Sean SUM, Hiroshi HARADA, Shuzo KATO, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | 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. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Cognitive interference mitigation / multiband / DS-UWB / multiple access / narrowband interference |
| Paper # | SR2007-46 |
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| Conference Information | |
| Committee | SR |
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| Conference Date | 2007/11/19(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (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) | Cognitive Interference Mitigation Techniques for Pulsed-Multiband DS-UWB System |
| Sub Title (in English) | |
| Keyword(1) | Cognitive interference mitigation |
| Keyword(2) | multiband |
| Keyword(3) | DS-UWB |
| Keyword(4) | multiple access |
| Keyword(5) | narrowband interference |
| 1st Author's Name | Chin-Sean SUM |
| 1st Author's Affiliation | National Institute of Information and Communications Technology (NICT)() |
| 2nd Author's Name | Hiroshi HARADA |
| 2nd Author's Affiliation | National Institute of Information and Communications Technology (NICT) |
| 3rd Author's Name | Shuzo KATO |
| 3rd Author's Affiliation | National Institute of Information and Communications Technology (NICT) |
| Date | 2007-11-26 |
| Paper # | SR2007-46 |
| Volume (vol) | vol.107 |
| Number (no) | 352 |
| Page | pp.pp.- |
| #Pages | 7 |
| Date of Issue | |