Abstract
Geometric dilution of precision (GDOP) represents the geometric contribution of observation errors to the positioning accuracy. GDOP is defined under the assumption of equal measurement variances. GDOP was originally used as a criterion for selecting the optimal geometric configuration of satellites in global positioning systems, which presents that the smaller the value the more precise the location. In this paper, we apply GDOP concepts to select appropriate base stations (BSs) in cellular communication systems. The proposed BS selection criterion performs better than the random subsets of four BSs chosen from all seven BSs. After BS selection, the proposed geometrical methods provide high accuracy of mobile station (MS) location estimation for time of difference arrival schemes. The results show that the poor geometry problem can be eliminated and the location accuracy can be significantly improved. From simulation results, the performances of MS location strongly depend on the relative position of the MS and BSs. Therefore, it is very important to select a subset with the most appropriate BSs rapidly and reasonably before positioning.
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© 2012 Springer Science+Business Media B.V.
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Su, SL., Su, YW., Chen, CS., Hwang, CT. (2012). Dilution of Position Calculation for MS Location Accuracy Improvement. In: Yang, Y., Ma, M. (eds) Green Communications and Networks. Lecture Notes in Electrical Engineering, vol 113. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-2169-2_17
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DOI: https://doi.org/10.1007/978-94-007-2169-2_17
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