Robust Time Synchronization Scheme Combating Frequency Offset for IEEE 802.16a OFDM Systems

Author

Yuan, Wu ; Zhiguo, Shi ; Kangsheng, Chen

Author_Institution

Dept. of Inf. Sci. & Electron. Eng., Zhejiang Univ., Hangzhou

Volume

2

fYear

2006

fDate

25-28 June 2006

Firstpage

1068

Lastpage

1072

Abstract

Orthogonal frequency division multiplexing (OFDM) is a promising technology for the next generation high-speed wireless communication. However, carrier frequency offset (CFO) induced by Doppler frequency drift and mismatch of the transceivers oscillators influences the time synchronization for OFDM systems. In this paper a robust time synchronization scheme compatible to IEEE 802.16a specification is proposed. It uses the symmetrical cross-correlation structure to eliminate the impact of frequency offset totally and to capture the accurate starting position of the FFT windows rapidly. Computer simulations demonstrate that the synchronization scheme is very efficient in combating large CFO

Keywords

Doppler shift; OFDM modulation; WiMax; correlation methods; fast Fourier transforms; oscillators; synchronisation; transceivers; CFO; Doppler frequency drift; FFT; IEEE 802.16a OFDM system; WiMax; carrier frequency offset; combating frequency offset; fast Fourier transform; next generation high-speed wireless communication; orthogonal frequency division multiplexing; symmetrical cross-correlation; time synchronization scheme; transceivers oscillator; Autocorrelation; Computer simulation; Degradation; Frequency division multiplexing; Frequency synchronization; OFDM modulation; Oscillators; Robustness; Transceivers; Wireless communication;

fLanguage

English

Publisher

ieee

Conference_Titel

Communications, Circuits and Systems Proceedings, 2006 International Conference on

Conference_Location

Guilin

Print_ISBN

0-7803-9584-0

Electronic_ISBN

0-7803-9585-9

Type

conf

DOI

10.1109/ICCCAS.2006.284832

Filename

4064073