Iterative carrier-frequency offset estimation for generalized OFDMA uplink transmission
IEEE Transactions on Wireless Communications
Multiple CFOs in OFDM-SDMA uplink: interference analysis and compensation
EURASIP Journal on Wireless Communications and Networking - Special issue on synchronization in 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
Carrier frequency offset tracking in the IEEE 802.16e OFDMA uplink
IEEE Transactions on Wireless Communications
| Hi-index | 35.68 |
In this paper, we address the joint data-aided estimation of frequency offsets and channel coefficients in uplink multiple-input multiple-output orthogonal frequency-division multiple access (MIMO-OFDMA) systems. As the maximum-likelihood (ML) estimator is impractical in this context, we introduce a family of suboptimal estimators with the aim of exhibiting an attractive tradeoff between performance and complexity. The estimators do not rely on a particular subcarrier assignment scheme and are, thus, valid for a large number of OFDMA systems. As far as complexity is concerned, the computational cost of the proposed estimators is shown to be significantly reduced compared to existing estimators based on ML. As far as performance is concerned, the proposed suboptimal estimators are shown to be asymptotically efficient, i.e., the covariance matrix of the estimation error achieves the Cramer-Rao bound when the total number of subcarriers increases. Simulation results sustain our claims.