High Resolution Time Of Arrival Estimation for OFDM-Based Transceivers

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Title: High Resolution Time Of Arrival Estimation for OFDM-Based Transceivers
Authors: Makki, Ahmed
Siddig, Abubakr
Saad, Mohamed M.
Cavallaro, J. R.
Bleakley, Chris J.
Permanent link: http://hdl.handle.net/10197/6171
Date: Oct-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.
Funding Details: Science Foundation Ireland
Type of material: Journal Article
Publisher: Institute of Engineering and Technology (IET)
Copyright (published version): 2014 Institute of Engineering and Technology
Keywords: Orthogonal frequency-division multiplexing (OFDM);Time Of Arrival (TOA);Altorithms
DOI: 10.1049/el.2014.3677
Language: en
Status of Item: Peer reviewed
Appears in Collections:Computer Science Research Collection

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