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Performance of Magnitude Sum Correlation and Vector Sum Correlation Methods for Robust Frame Synchronization Under Low Signal-to-Noise Ratios  

Lee, Dong-Uk (Department of Electronics Engineering, Sogang University)
Kim, Sang-Tae (Department of Electronics Engineering, Sogang University)
Sung, Won-Jin (Department of Electronics Engineering, Sogang University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.45, no.7, 2008 , pp. 32-37 More about this Journal
Abstract
Satellite communication systems including the DVB-S2 (Digital Video Broadcasting - Satellite Version 2) system require operations under low signal-to-noise ratio (SNR) and large frequency offset values, and the initial frame synchronization process necessitates a robust correlation method. While a variety of conventional correlation structures exist for the initial synchronization, each method has different characteristics and performance in different channel environments. In this paper, we propose new correlation methods which exhibit enhanced performance in low SNR and large frequency offsets, and analyze their performance. The proposed methods use the magnitude sum and vector sum of extended differential correlation values, to maximize the correlation between the received signal and the synchronization sequence by using the spanned differential correlation result. The magnitude sum correlation method has better performance compared to conventional methods including the approximated ML (Maximum likelihood) method for SNR values below 4 dB with or without frequency offsets. The vector sum correlation method has improved performance over the magnitude sum method for channels with relatively small frequency offsets.
Keywords
DVB-S2;
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