tailieunhanh - Báo cáo hóa học: "Research Article Robust Frame Synchronization for Low Signal-to-Noise Ratio Channels Using Energy-Corrected Differential Correlation Dong-Uk Lee,1 Pansoo"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Robust Frame Synchronization for Low Signal-to-Noise Ratio Channels Using Energy-Corrected Differential Correlation Dong-Uk Lee,1 Pansoo | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2009 Article ID 345989 8 pages doi 2009 345989 Research Article Robust Frame Synchronization for Low Signal-to-Noise Ratio Channels Using Energy-Corrected Differential Correlation Dong-Uk Lee 1 Pansoo Kim 2 and Wonjin Sung1 1 Department of Electronic Engineering Sogang University Seoul 121-742 South Korea 2Satellite Wireless Convergence Research Department Electronics and Telecommunications Research Institute Daejeon 305-700 South Korea Correspondence should be addressed to Wonjin Sung wsung@ Received 1 July 2008 Revised 21 December 2008 Accepted 1 February 2009 Recommended by Marco Luise 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 . Copyright 2009 Dong-Uk Lee et al. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. Introduction