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A Non-Pilot Aided Iterative Carrier Frequency Offset Estimator Using Optimal Filtering for an Interleaved OFDMA Uplink System

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Abstract

In an uplink transmission of a coded orthogonal frequency division multiple access (C-OFDMA) system, channel estimation, time and frequency synchronization has to be addressed. For this purpose a control data, i.e. a known training sequence called “preamble” and pilot sub-carriers are used. As an alternative to the classic scheme and in order to maximize the data rate, we propose a non-pilot aided estimator based on an iterative architecture that does not require pilot sub-carriers. Our approach combines 1/ the so-called minimum mean square error successive detector to estimate the signal sent by each user 2/ a recursive method estimating the CFOs. Various algorithms such as the extended Kalman filter, the sigma-point Kalman filters and the extended H ∞ filter are tested and their performances are compared in terms of convergence speed and estimation accuracy. When considering an interleaved OFDMA uplink system over a Rayleigh fading channel, simulation results clearly show the efficiency of the proposed algorithm in terms of CFO estimation and bit error rate performances.

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Authors and Affiliations

  1. Equipe Signal et Image, IPB-ENSEIRB-MATMECA, UMR CNRS 5218 IMS, Université Bordeaux 1, 351 cours de la libération, 33405, Talence Cedex, France

    Héctor Poveda, Guillaume Ferré & Eric Grivel

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  1. Héctor Poveda
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  2. Guillaume Ferré
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  3. Eric Grivel
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Correspondence to Héctor Poveda.

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Poveda, H., Ferré, G. & Grivel, E. A Non-Pilot Aided Iterative Carrier Frequency Offset Estimator Using Optimal Filtering for an Interleaved OFDMA Uplink System. Wireless Pers Commun 68, 747–767 (2013). https://doi.org/10.1007/s11277-011-0480-7

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