Interference-Aware Location Estimation in Cellular OFDM Communications Systems

[aubidamax]

Abstract

—In this paper, we consider location estimation algorithms
using cellular orthogonal frequency division multiplexing
(OFDM) communications systems. In the classical approach the
mobile station (MS) determines time difference of arrival (TDOA)
information from the received signals of at least three base
stations (BSs). With these TDOAs the location of the MS is
estimated. However, only at the cell edge a good reception of
several BSs is ensured. Especially for future systems targeting
a frequency re-use of one, interference is a limiting factor.
Hence, in the inner cell it is difficult to detect out-of-cell BSs
with sufficient quality. Therefore, we propose an interference
cancellation scheme to improve the performance in these critical
situations for TDOA positioning. Simulation results for a 3GPPLTE
system show the ability of this approach to increase the
accuracy and to extend the coverage of the overall location

estimation.
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