Title :
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
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;
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
DOI :
10.1109/ICCCAS.2006.284832
