Frequency estimation in the uplink of an orthogonal frequency-division multiple-access system is a challenging task due to the presence of multiple carrier frequency offsets. Many existing solutions are too complex for practical implementation, while others are restricted to a specific subcarrier assignment strategy. Motivated by the above consideration, in this letter we propose a novel frequency estimator that allows flexible subcarrier assignment while requiring a low computational burden. Our scheme exploits the repetitive structure of the users' training sequences, which are properly designed so as to minimize the multiple-access interference arising in the presence of frequency errors. Computer simulations are used to assess the effectiveness of the proposed method and to make comparisons with competing alternatives.
|Autori:||Sanguinetti L; Morelli M|
|Titolo:||A Low-Complexity Scheme for Frequency Estimation in Uplink OFDMA Systems|
|Anno del prodotto:||2010|
|Digital Object Identifier (DOI):||10.1109/TWC.2010.061410.091459|
|Appare nelle tipologie:||1.1 Articolo in rivista|