DocumentCode :
3434563
Title :
A new scheme for preamble detection and frequency acquisition in OFDM systems
Author :
Najjar, Leìla ; Siala, Mohamed
Author_Institution :
Lab. TECHTRA, Ecole Super. des Commun., Ariana, Tunisia
fYear :
2009
fDate :
13-16 Dec. 2009
Firstpage :
1008
Lastpage :
1011
Abstract :
In this contribution, we propose a novel scheme for time and frequency synchronization in OFDM systems. A differential modulation is indeed used to design two training symbols with appropriate properties used as a preamble for the detection of the frame start and for the recovery of the integral carrier frequency offset. The new scheme is compared to the well known algorithm of Cox and Schmidl, also using two training symbols, and found to outperform it especially in timing acquisition for both AWGN and Rayleigh channels. As a byproduct, an estimator for the channel power profile is obtained. All the derived estimators performance depend on the choice of the symbols involved in training. We here discuss the properties for optimal performance and compare the results for a set of Gold, Kasami and Zadoff-Chu sequences.
Keywords :
AWGN channels; OFDM modulation; Rayleigh channels; synchronisation; AWGN; Gold sequence; Kasami sequence; OFDM systems; Rayleigh channels; Zadoff-Chu sequence; channel power profile; differential modulation; frequency acquisition; frequency synchronization; integral carrier frequency offset; preamble detection; time synchronization; timing acquisition; Data models; Digital video broadcasting; Fading; Frequency conversion; Frequency estimation; Frequency synchronization; Intersymbol interference; OFDM modulation; TV broadcasting; Timing;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Electronics, Circuits, and Systems, 2009. ICECS 2009. 16th IEEE International Conference on
Conference_Location :
Yasmine Hammamet
Print_ISBN :
978-1-4244-5090-9
Electronic_ISBN :
978-1-4244-5091-6
Type :
conf
DOI :
10.1109/ICECS.2009.5410837
Filename :
5410837
Link To Document :
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