A Study of Iterative Joint Synchronization for Time Offset and Frequency Offset in IEEE802.16d WirelessMAN OFDM System

Author

Ge, Yiqun ; Shi, Wuxian ; Sun, Guobin

Author_Institution

Adv. Syst. Technol., ST Microelectron., Beijing

fYear

0

fDate

0-0 0

Firstpage

1217

Lastpage

1221

Abstract

This paper is a study of an iterative joint algorithm for frequency offset and time offset synchronizations used in 256 orthogonal frequency division multiplexing of IEEE 802.16d wireless-MAN system. As deployed in an urban area and targeted at providing a high data rate transmission, IEEE 802.16d system requires a robust synchronization mechanism to guarantee the transmission reliability. A time-domain preamble structure is provided in IEEE 802.16d standard to detect and correct the synchronization errors along time and frequency dimensions. Our research focus on the study of an iterative joint algorithm for time offset and frequency offset synchronization based on the preamble. And we simulate this algorithm based on a framed wireless-MAN 256 OFDM downlink physical layer simulation link to investigate its performance. The simulation results show that this algorithm could reduce the probability of synchronization failure below 10^-4 when E_s/N₀ is larger than 14 dB, and that it is not sensitive to channel spread delay and moving speed in a fixed broadband wireless environment. Finally, two transmission rates are simulated with this algorithm to show its application effectiveness

Keywords

IEEE standards; OFDM modulation; WiMax; broadband networks; channel estimation; iterative methods; synchronisation; telecommunication standards; time-domain analysis; IEEE 802.16d standard; channel estimation; frequency offset synchronization; iterative joint algorithm; metropolitan area network; orthogonal frequency division multiplexing; time offset synchronization; time-domain preamble structure; wireless-MAN OFDM system; Delay; Downlink; Error correction; Frequency synchronization; Iterative algorithms; OFDM; Physical layer; Robustness; Time domain analysis; Urban areas; IEEE 802.16d; LS Channel Estiatimation; OFDM; Synchronization;

fLanguage

English

Publisher

ieee

Conference_Titel

Information, Communications and Signal Processing, 2005 Fifth International Conference on

Conference_Location

Bangkok

Print_ISBN

0-7803-9283-3

Type

conf

DOI

10.1109/ICICS.2005.1689248

Filename

1689248