DocumentCode :
3379324
Title :
A Novel Maximum Likelihood Frequency Synchronizer for OFDM Systems
Author :
Zhang, Jie ; Liao, Guisheng ; Liu, Hongqing
Author_Institution :
Nat. Lab. of Radar Signal Process., Xidian Univ., Xi´´an
fYear :
2005
fDate :
21-24 Nov. 2005
Firstpage :
1
Lastpage :
6
Abstract :
Feedback carrier frequency recovery for orthogonal frequency-division multiplexing (OFDM) signals transmitted over frequency selective fading channels is presented in this paper. Its derivation is based on minimum variance conditioned maximum likelihood (MV-CML) principle. The channel power on subcarriers required to perform frequency synchronization is regarded as unknown slowly time-variant parameter and is estimated online. The performance of the proposed synchronizer is assessed by computer simulations with comparison to that provided by other schemes and modified Cramer-Rao lower bound (MCRB). Both theoretical analysis and simulation results show that our synchronization scheme is a good candidate for OFDM frequency synchronization.
Keywords :
OFDM modulation; channel estimation; fading channels; frequency estimation; maximum likelihood estimation; synchronisation; OFDM systems; feedback carrier frequency recovery; frequency selective fading channels; frequency synchronization; maximum likelihood frequency synchronizer; minimum variance conditioned maximum likelihood principle; modified Cramer-Rao lower bound; orthogonal frequency-division multiplexing; time-variant parameter; Computational modeling; Computer simulation; Fading; Feedback; Frequency division multiplexing; Frequency estimation; Frequency synchronization; Maximum likelihood estimation; OFDM; Parameter estimation;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
TENCON 2005 2005 IEEE Region 10
Conference_Location :
Melbourne, Qld.
Print_ISBN :
0-7803-9311-2
Electronic_ISBN :
0-7803-9312-0
Type :
conf
DOI :
10.1109/TENCON.2005.301224
Filename :
4085054
Link To Document :
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