Multipath Estimating Delay Lock Loop for LTE Signal TOA Estimation in Indoor and Urban Environments

Citations Over TimeTop 10% of 2020 papers

Abstract

Long-term evolution (LTE) signals are potential signals-of-opportunity for position and navigation, especially in challenging urban and indoor environments. A major challenge is that the LTE signal time-of-arrival (TOA) estimations are susceptible to the multipath propagation effects. In this paper, the multipath estimating delay lock loop (MEDLL), which is originally designed for global positioning system receivers, is applied to LTE signal TOA estimation in multipath environments. We derive the analytical expression of the correlation function for LTE signals and present the procedure for estimating parameters of the detected multipath components. Two initialization methods without and with super-resolution algorithm (SRA) are developed for the MEDLL. Our analyses show that the MEDLL with SRA-based initialization can achieve better multipath resolution, while the one without SRA has less complexity. Extensive simulations involving static multipath scenarios are conducted to examine the statistical TOA estimation performance of the proposed MEDLL with LTE cell-specific reference signal. The simulation results and computational complexity analysis indicate that the proposed MEDLL outperforms the conventional delay lock loop and SRA in term of multipath mitigation performance and computational complexity. Experimental results using real collected LTE signals in urban environments are also provided to demonstrate the effectiveness of the proposed technique for realistic scenarios.

Related Papers

• → GNSS CODE AND CARRIER TRACKING IN THE PRESENCE OF MULTIPATH(1997)25 cited
• → Two-Step Unbiased Estimation on Small-Delay Multipath of GNSS Signals Based on S-Curve Bias(2023)7 cited
• → A Method of Carrier Phase Multipath Mitigation Based on Punctual Code Correlation Reference Waveform(2018)4 cited
• → A Short-Delay Multipath Mitigation Algorithm Based on Variable Step-Size LMS Adaptive Filtering(2014)
• → Multipath Signal Error Correction in a Dominant Multipath Environment(2008)