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Location Error Reduction method using Iterative Calculation in UWB system  

Jang, Sung-Jeen (Inha Graduate school of information Technology & Telecommunications)
Hwang, Jae-Ho (Inha Graduate school of information Technology & Telecommunications)
Choi, Nack-Hyun (Inha Graduate school of information Technology & Telecommunications)
Kim, Jae-Moung (Inha Graduate school of information Technology & Telecommunications)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.45, no.12, 2008 , pp. 105-113 More about this Journal
Abstract
In Ubiquitous Society, accurate Location Calculation of user's device is required to achieve the need of users. As the location calculation is processed by ranging between transceivers, if some obstacles exist between transceivers, NLoS(Non-line-of-Sight) components of received signal increase along with the reduction of LoS(Line-of-Sight) components. Therefore the location calculation error will increase due to the NLoS effect. The conventional location calculation algorithm has the original ranging error because there is no transformation of ranging information which degrades the ranging accuracy. The Iterative Calculation method which minimizes the location calculation error relys on accurately identifying NLoS or LoS condition of the tested channel. We employ Kurtosis, Mean Excess Delay and RMS Delay spread of the received signal to identify whether the tested channel is LoS or NLoS firstly. Thereafter, to minimize location calculation error, the proposed Iterative Calculation method iteratively select random range and finds the averaged target location which has high probability. The simulation results confirm the enhancement of the proposed method.
Keywords
Ultra wideband; Localization; NLoS/LoS Identification;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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1 IEEE 802.15 Working Group for WLANs, "Draft Standard for Part 15.4: Wireless Medium Access Control (MAC) and Physical Layer (PHY) specifications for Low Rate Wireless Personal Area Networks (LR-WPAN)," TG4a drafting Jan. 2007
2 Joanes, D. N. & Gill, C. A. "Comparing measures of sample skewness and kurtosis," Journal of the Royal Statistical Society, pp 183-189, 1998
3 Jae Ho Hwang, Jong Ok Joo, Sung Jeen Jang, Jae Moung Kim, "Detection Method Using Pseudo Injured Code in LR-UWB system," ICEIC, pp24-27, Jun. 2008
4 Zafer Sahinoglu and Sinan Gezici, "Ranging in the IEEE 802.15.4a Standard," IEEE Wireless and Microwave Technology Conference (WAMICON), Dec. 2006
5 이경탁, 이성준, 손성환, 김재명, "LP-WPAN 시스템에서 심볼 전력 할당과 2개의 직교 코드를 사용한 채널 추정 기법," 대한전자공학회 논문지 44권 No.11호, pp. 1-10, 2007년 11월   과학기술학회마을
6 공현민, 성태경, 권영미, "UWB 실내 측위를 위한 TDOA 위치결정기법," 대한전자공학회 논문지 제42권 TC편 제1호, pp. 9-15, 2005년 1월   과학기술학회마을
7 Gustafsson. F and Gunnarsson. F. ,"Mobile positioning using wireless networks: Possibilities and fundamental limitations based on available wireless network measurements," IEEE Signal Processing Magazine, pp. 41-53. July 2005
8 J. Foerster, E. Green, S. Somayazulu, and D. Leeper, "Ultra-Wideband Technology for Short or Medium Range Wireless Communications," Intel Technology Journal, pp. 1-11, 2001
9 Ismail Guvenc, Chia-Chin Chong and Fujio Watanabe, "NLOS Identification and Mitigation for UWB Localization Systems," Proc. IEEE Wireless Commun. Networking Conf.(WCNC), pp. 1571-1576, March 2007
10 A. F. Molisch et al., "IEEE 802.15.4a channel model - final report," IEEE 802.15 WPAN Low Rate Alternative PHY Task Group 4a (TG4a), Tech. Rep., Nov. 2004
11 Gezici. S., Zhi Tian, Giannakis G.B., Kobayashi H., "Localization via ultra-wideband radios: a look at positioning aspects for future sensor networks," IEEE Signal Processing Magazine, pp. 70-84 July 2005