Residual Carrier and Sampling Frequency Synchronization in Multiuser OFDM Systems

Author

Haring, L. ; Bieder, S. ; Czylwik, A.

Author_Institution

Dept. of Commun. Syst., Duisburg-Essen Univ., Duisburg

Volume

4

fYear

2006

fDate

7-10 May 2006

Firstpage

1937

Lastpage

1941

Abstract

This contribution considers the estimation and compensation of residual multiple carrier frequency offsets (CFOs) and sampling frequency offsets (SFOs) in the uplink of a multiuser OFDM system. Based on the observation of a user-dependent phase rotation, an approximate maximum-likelihood (ML) estimator is proposed in order to estimate the CFOs and SFOs to track the phase in a post-synchronization step. Bit-error-ratio (BER) simulations show that the system performance degradation due to (small) frequency mismatches is negligible if the proposed method is applied

Keywords

OFDM modulation; frequency estimation; maximum likelihood estimation; synchronisation; maximum-likelihood estimator; multiuser OFDM systems; residual multiple carrier frequency offsets; sampling frequency offsets; sampling frequency synchronization; user-dependent phase rotation; Base stations; Bit error rate; Frequency estimation; Frequency synchronization; Maximum likelihood estimation; Multiaccess communication; OFDM; Phase estimation; Receiving antennas; Sampling methods;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 2006. VTC 2006-Spring. IEEE 63rd

Conference_Location

Melbourne, Vic.

ISSN

1550-2252

Print_ISBN

0-7803-9391-0

Electronic_ISBN

1550-2252

Type

conf

DOI

10.1109/VETECS.2006.1683184

Filename

1683184