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http://dx.doi.org/10.5302/J.ICROS.2012.18.4.375

Enhancement of Hearability in Geolocation Using Mobile WiMAX Network with Interference Cancellation and Long Integration  

Park, Ji-Won (Chungnam National University)
Lim, Jeong-Min (Chungnam National University)
Sung, Tae-Kyung (Chungnam National University)
Publication Information
Journal of Institute of Control, Robotics and Systems / v.18, no.4, 2012 , pp. 375-383 More about this Journal
Abstract
Together with the GPS-based approach, geolocation through mobile communication networks is a key technology for location-based service. Since the Mobile WiMAX system is considered as a candidate for fourth-generation mobile systems, it is important to investigate its location capability. The geolocation of Mobile WiMAX can be realized when the preamble symbols in the down-link channel are appropriately used for a TDOA (Time-Difference-of-Arrival) approach. However, the cellular structure of Mobile WiMAX inevitably generates co-channel interference, and it is difficult for the mobile terminal to acquire distance measurements from multiple base stations. Therefore, for geolocation via multilateration using the Mobile WiMAX network, it is very important to increase hearability. This paper proposes a geolocation method for Mobile WiMAX which employs interference cancellation and preamble signal overlapping for the enhancement of hearability. A novel interference cancellation strategy for complex-valued Mobile WiMAX signals is presented which has an iterative structure. Simulation results show that the proposed geolocation method provides the user's position with an accuracy of less than 20 m through the Mobile WiMAX cellular network if there is no multi-path or NLOS (None-Line-of-Sight).
Keywords
WiBro; geo-location; interference cancelation;
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