Mobile Communications Engineering: Theory and Applications
Mobile Communications Engineering: Theory and Applications
Coherent Spread Spectrum System
Coherent Spread Spectrum System
GSM Networks: Protocols, Terminology, and Implementation
GSM Networks: Protocols, Terminology, and Implementation
Microwave Mobile Communications
Microwave Mobile Communications
The GSM System for Mobile Communications
The GSM System for Mobile Communications
Digital Communications and Spread Spectrum System
Digital Communications and Spread Spectrum System
Optimizing location positioning using hybrid TOA-AOA techniques in mobile cellular networks
Proceedings of the 3rd international conference on Mobile multimedia communications
Hybrid TDOA/AOA mobile user location for wideband CDMA cellular systems
IEEE Transactions on Wireless Communications
Overview of radiolocation in CDMA cellular systems
IEEE Communications Magazine
IEEE Communications Magazine
Standardization of mobile phone positioning for 3G systems
IEEE Communications Magazine
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Positioning algorithms and their implementation in mobile networks are being investigated in the literature due to their importance in location services. Nowadays, the need for superior accuracy has cast attention to hybrid positioning techniques. In this paper, we introduce a novel algorithm for the identification of NLOS propagation using both angle and time estimates, which leads to enhanced versions of the Time of Arrivals and Angle of Arrivals positioning methods. Furthermore, a novel GSM procedure for the implementation of the latter techniques is proposed. In contrast to specified network-based GSM solutions (U-TDOA), the proposed requires minimum modifications in the GSM Phase 2+ infrastructure and protocol stack, and therefore increases the upgrade flexibility and minimizes the implementation cost. The proposed GSM positioning procedure has been experimentally validated using a GSM emulator and the modified signalling messages given by a measurement tool of the emulator are exhibited. Finally, the enhanced cost functions are experimentally evaluated using several GSM-like, high-capacity simulation environments and the results have shown significant reduction of the location error compared to the conventional techniques.