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Frame Synchronization Algorithm based on Differential Correlation for Burst OFDM System  

Um Jung-Sun (성균관대학교 전자전기공학과 통신시스템연구실)
Do Joo-Hyun (성균관대학교 전자전기공학과 통신시스템연구실)
Kim Min-Gu (삼성전자 TN총괄 통신연구소)
Choi Hyung-Jin (성균관대학교 전자전기공학과 통신시스템연구실)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.30, no.10C, 2005 , pp. 1017-1026 More about this Journal
Abstract
In burst OFDM system, the frame synchronization should be performed first for the acquisition of received frame and the estimation of the correct FFT-window position. The conventional frame synchronization algorithms using design features of the preamble symbol, the repetition pattern of the OFDM symbol by pilot sub-carrier allocation rule and Cyclic Prefix(CP), has difficulty in the detection of precise frame timing because its correlation characteristics would increase and decrease gradually. Also, the algorithm based on the correlation between the reference signal and the received signal has performance degradation due to frequency offset. Therefore, we adopt a differential correlation method that is robust to frequency offset and has the clear peak value at the correct frame timing for frame synchronization. However, performance improvement is essential for differential correlation methods, since it usually shows multiple peak values due to the repetition pattern. In this paper, we propose an enhanced frame synchronization algorithm based on the differential correlation method that shows a clear single peak value by using differential correlation between samples of identical repeating pattern. We also introduce a normalization scheme which normalizes the result of differential correlation with signal power to reduce the frame timing error in the high speed mobile channel environments.
Keywords
OFDM; wireless MAN; frame synchronization; differential correlation;
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