Type

Journal Article

Authors

Chris Bleakley
J. R. Cavallaro
Mohamed M. Saad
Abubakr Siddig
Ahmed Makki

Subjects

Computer Science

Topics
local area network orthogonal frequency division multiplexing ofdm time of arrival toa cross correlation altorithms time estimation frequency domain high resolution

High Resolution Time Of Arrival Estimation for OFDM-Based Transceivers (2014)

Abstract This letter presents a novel algorithm for Time Of Arrival (TOA) estimation for Orthogonal Frequency Division Multiplexing (OFDM) based transceivers. The algorithm processes the sampled baseband signal to obtain a high resolution estimate of the TOA of the OFDM symbol. In the first step, the algorithm obtains a sample resolution estimate of the TOA by finding the peak of the absolute value of the cross-correlation of the in-phase and quadrature received signals with the known transmitted symbol. In the second step, the algorithm refines this estimate to sub-sample resolution by estimating the phase delay of the received signal based on the gradient of a linear fit to the phase difference between the transmitted and received sub-carriers (in the frequency domain). The algorithm was applied to the Long Training Sequence (LTS) symbol of the IEEE Wireless Local Area Network (WLAN) 802.11g preamble. In real-world experiments, the algorithm was found to achieve a mean TOA estimation error of 49 cm in a low multi-path Line Of Sight (LOS) environment for ranges of 1-7 m.
Collections Ireland -> University College Dublin -> College of Science
Ireland -> University College Dublin -> School of Computer Science
Ireland -> University College Dublin -> Computer Science Research Collection

Full list of authors on original publication

Chris Bleakley, J. R. Cavallaro, Mohamed M. Saad, Abubakr Siddig, Ahmed Makki

Experts in our system

1
Chris Bleakley
University College Dublin
Total Publications: 105