Title :
Joint timing and frequency synchronization for IEEE 802.16 OFDM systems
Author :
Yan, Yanxin ; Tomisawa, Masayuki ; Gong, Yi ; Guan, Yong Liang ; Wu, Gang ; Law, Choi Look
Author_Institution :
Oki Techno Centre Pte Ltd
Abstract :
In this paper we present joint timing and frequency synchronization algorithms for IEEE 802.16 orthogonal frequency division multiplexing (OFDM) systems. It is found that the proposed integer frequency offset (IFO) estimation can tolerate large IFO experienced by the 802.16 OFDM systems and is insensitive to timing error. For multipath channel, the fine timing synchronization provides not only the accurate position of incoming frame but also the positions of several paths that have large power. These positions can be used to locate the FFT window properly to eliminate inter-symbol interference (ISI). Simulation results demonstrate that the proposed joint timing and frequency synchronization algorithms have good performance even at low signal-to-noise ratio (SNR) in multipath environment with large frequency offset
Keywords :
OFDM modulation; fast Fourier transforms; intersymbol interference; multipath channels; time-frequency analysis; FFT; IEEE 802.16 OFDM system; IFO estimation; ISI; fast Fourier transform; integer frequency offset; intersymbol interference; joint timing-frequency synchronization; multipath channel; orthogonal frequency division multiplexing; Bandwidth; Delay estimation; Frequency estimation; Frequency synchronization; Intersymbol interference; Least squares approximation; OFDM; Robustness; Signal to noise ratio; Timing;
Conference_Titel :
Mobile WiMAX Symposium, 2007. IEEE
Conference_Location :
Orlando, FL
Print_ISBN :
1-4244-0957-8
DOI :
10.1109/WIMAX.2007.348680