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Together with the GPS-based approach, geo-location through mobile communication networks is a key technology for location-based service. To save the cost, most geo-location system is implemented on the existed network service, which has a cellular structure. Still, multilateration is limited in cellular structure because it is difficult for the mobile terminal to acquire distance measurements from multiple base stations. This low hearability in the receiver is caused by co-channel interference and multipath environment. Therefore, hearability enhancement is necessary for multilateration under multipath and interference environment. Former time domain based hearability methods were designed for real signals. However, orthogonal frequency division multiplexing (OFDM) signal, which its usage has been increased in digital wireless communication, is a complex signal. Thus, different hearability enhancement method is needed for OFDM signals. This paper proposes a hearability enhancement method for forward-link multilateration using OFDM signals, which employ interference cancellation and multipath mitigation. A novel interference cancellation and multipath mitigation strategy for complex-valued OFDM signals is presented that has an iterative structure. Simulation results show that the proposed multilateration method provides the user’s position with an accuracy of less than 80m through the mobile WiMAX cellular network in multipath environment.

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참고문헌 (29건) : 자료제공( 네이버학술정보 )

참고문헌 목록에 대한 테이블로 번호, 참고문헌, 국회도서관 소장유무로 구성되어 있습니다.
번호 참고문헌 국회도서관 소장유무
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7 S. Soliman et al., “GPS Receiver Sensitivity Enhancement In Wireless Applications,” Technologies for wireless applications IEEE MTT-S Symposium, Vancouver, BC., Canada, Feb. 21-24, 1999. 미소장
8 Overview of radiolocation in CDMA cellular systems 네이버 미소장
9 Modulation, coding and signal processing for wireless communications - Interference cancellation for cellular systems: a contemporary overview 네이버 미소장
10 Interference coordination and cancellation for 4G networks 네이버 미소장
11 IEEE. Standard 802.16e-2005 and IEEE Standard 802.16-2004/Cor1-2005, Part16: Air interface for fixed and mobile broadband wireless access systems. Amendment 2: Physical and Medium Access Control Layers for Combined Fixed and mobile Operation in Licensed Bands and Corrigendum 1, Feb. 2006. 미소장
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16 DTFT-based frequency lock loop for GNSS applications 네이버 미소장
17 S. Kay, Fundamentals of Statistical Signal Processing, Estimation Theory, Prentice Hall, 1998. 미소장
18 S. K. Shanmugam, “Improving GPS L1 C/A code correlation properties using a novel multi-correlator differential detection technique,” ION GNSS 2006, Fort Worth TX, Sep. 26-29, 2006. 미소장
19 A. Radovic, “An iterative near-far resistant algorithm for joint parameter estimation in asynchronous CDMA systems,” in Proceedings of 5th Int. Symp. Personal, Indoor, Mobile Radio Commun., Hague, Netherlands, pp. 199-203, Sept. 18-23, 1994. 미소장
20 H. Lutkepohl, Handbook of Matrix, John Wiley & Sons, 1996, pp. 131-132. 미소장
21 H. L. Van trees, Optimum Array Processing, Part IV of Detection, Estimation, and Modulation Theory, John Wiley & Sons, 2002, pp. 1364-1365. 미소장
22 ITU-R Recommendation m.1225, Guidelines for evaluation of radio transmission technologies for IMT-2000, 1997. 미소장
23 ITU-R WP 5D, Guidelines for Evaluation of Radio Interface Technologies for IMT-Advanced, R07- WP5D-080128-TD-0046, Jan. 2008. 미소장
24 A simple and efficient estimator for hyperbolic location 네이버 미소장
25 COFDM: an overview 네이버 미소장
26 Maximum-likelihood-based multipath channel estimation for code-division multiple-access systems 네이버 미소장
27 Multipath interference canceller for high-speed packet transmission with adaptive modulation and coding scheme in W-CDMA forward link 네이버 미소장
28 M. Z. H. Bhuiyan., E. S. Lohan., “Advanced Multipath Mitigation Techniques for Satellite-Based Positioning Applications,” International Journal of Navigation and Observation, Vol. 2010, Article ID 412393. 미소장
29 Y. Wang., C. C. Chai., T. T. Tjhung., “Multipath interference cancellation scheme for multicode CDMA systems in multipath fading channels,” in Proceedings of IEEE WCNC, 2004, pp. 1817-1822. 미소장

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