Title :
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
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;
Conference_Titel :
Vehicular Technology Conference, 2006. VTC 2006-Spring. IEEE 63rd
Conference_Location :
Melbourne, Vic.
Print_ISBN :
0-7803-9391-0
Electronic_ISBN :
1550-2252
DOI :
10.1109/VETECS.2006.1683184
