IEEE Transactions on Wireless Communications
Joint CFO and channel estimation for OFDMA uplink: an application of the variable projection method
IEEE Transactions on Wireless Communications
Low complexity iterative interference cancelation for OFDMA uplnik with carrier frequency offsets
APCC'09 Proceedings of the 15th Asia-Pacific conference on Communications
A simple solution for the carrier frequency offset estimation for tile-based OFDMA uplink
APCC'09 Proceedings of the 15th Asia-Pacific conference on Communications
A low-complexity scheme for frequency estimation in uplink OFDMA systems
IEEE Transactions on Wireless Communications
Carrier frequency offset tracking in the IEEE 802.16e OFDMA uplink
IEEE Transactions on Wireless Communications
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This paper proposes a novel iterative joint estimation of channels and frequency offsets for uplink OFDMA systems. The proposed method is based on the iterative line search algorithm with a trust region. The objective function minimizes the mean-square distance between the received vector and the reconstructed received vector based on the estimated parameters. In each iteration, the parameters are updated based on the minimum mean square error criterion. We also present a stop criterion for the iterative algorithm. The simulation results show the fast convergence rate of the proposed algorithm with asymptotic performance approaching the average CRBs (averaged over the random frequency offsets and fading channels). Our proposed method achieves a much lower computational complexity and better bit error rate performance than the existing SAGE method.