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ThinkMind // International Journal On Advances in Telecommunications, volume 10, numbers 1 and 2, 2017 // View article tele_v10_n12_2017_7


An Improved Preamble Aided Preamble Structure Independent Coarse Timing Estimation Method for OFDM Signals

Authors:
Soumitra Bhowmick
Kasturi Vasudevan

Keywords: Timing synchronization; OFDM; Preamble; carrier frequency offset; Timing metric; MSE; Probability of erasure; Probability of correct estimation.

Abstract:
Timing estimation has been one of the major research issue in orthogonal frequency division multiplexing (OFDM) systems. In the literature there are mainly two types of preamble (data) aided timing estimation methods have been proposed. One type of timing estimation methods that depend on the specific structure of the preamble and the other type of timing estimation methods that work independent of the structure of the preamble. Performance of most of the timing estimation methods, which work independent of the structure of the preamble is severely affected in the presence of carrier frequency offset (CFO). The challenge is to design a preamble structure independent timing metric that should be robust to CFO. In this paper, a data aided coarse (initial) timing estimation scheme for OFDM system is proposed. Proposed timing estimation method is independent of the structure of the preamble and it works better than the other existing methods in the presence of CFO. The algorithm is also capable of using multiple preambles for coarse timing estimation. The performance is compared in terms of probability of erasure, probability of correct estimation and mean square error (MSE) with the existing timing synchronization methods for OFDM systems.

Pages: 72 to 84

Copyright: Copyright (c) to authors, 2017. Used with permission.

Publication date: June 30, 2017

Published in: journal

ISSN: 1942-2601

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