Robust frame synchronization for low signal-to-noise ratio channels using energy-corrected differential correlation

  • Authors:

  • Dong-Uk Lee;Pansoo Kim;Wonjin Sung

  • Affiliations:

  • Department of Electronic Engineering, Sogang University, Seoul, South Korea;Satellite & Wireless Convergence Research Department, Electronics and Telecommunications Research Institute, Daejeon, South Korea;Department of Electronic Engineering, Sogang University, Seoul, South Korea

  • Venue:
  • EURASIP Journal on Wireless Communications and Networking - Special issue on synchronization in wireless communications
  • Year:
  • 2009

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Abstract

Recent standards for wireless transmission require reliable synchronization for channels with low signal-to-noise ratio (SNR) as well as with a large amount of frequency offset, which necessitates a robust correlator structure for the initial frame synchronization process. In this paper, a new correlation strategy especially targeted for low SNR regions is proposed and its performance is analyzed. By utilizing a modified energy correction term, the proposed method effectively reduces the variance of the decision variable to enhance the detection performance. Most importantly, the method is demonstrated to outperform all previously reported schemes by a significant margin, for SNRs below 5 dB regardless of the existence of the frequency offsets. A variation of the proposed method is also presented for further enhancement over the channels with small frequency errors. The particular application considered for the performance verification is the second generation digital video broadcasting system for satellites (DVB-S2).