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Timing Advanced Estimation Algorithm of Low Complexity Based on DFT Spectrum Analysis for satellite System

China communications 2015年第4期12卷 140-150页

作者： HE Yizhou CUI Gaofeng LI Pengxu CHANG Ruijun WANG Weidong Key Laboratory of Universal Wireless communications Ministry of EducationBeijingChinaSchool of electronic engineeringBeijing University of Posts and Telecommunications

In satellite mobile communication system, relative movement of the satellite and the terminal will cause a large Doppler offset. Timing advanced estimation with Zadoff-Chu sequence is sensitive to the frequency offset. When the frequency offset is larger than one times subcarrier spacing, the value of peak cannot be detected at the receiving end. To suppress the larger Doppler frequency shift, this paper proposes a novel timing advanced estimation scheme(TAE-MCD) for satellite communication system. In this algorithm, t r a n s m i t t e d s i g n a l i s d i v i d e d i n t o Z C sequence and its conjugate sequence. Using multiplication and DFT operation to find the estimated peak at the receiving end, and make subtraction with the obtained sequences at last. The scheme can not only inhibit the adverse effects of large Doppler frequency shift in timing estimation effectively, but also reduce the computational complexity at the receiving end and improve the work efficiency of the hardware. Simulations results show that TAEMCD outperform the existing timing advanced estimation methods, on the condition of no additional time and frequency resource are needed.

关键词： timing estimation zadoff-chu DFT low complexity satellite communi-cations

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New Developments in Maritime communications： a Comprehensive Survey

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China communications 2012年第2期9卷 31-42页

作者： Chen Weigang Yang Jinsheng Ma Jianguo Li Si School of Electronic Information Engineering Tianjin UniversityTianjin 300072P.R.China

This paper summarizes the requirements for modem maritime wireless communication networks in the marine environments including the sea- to-sea and sea-to-shore communication scenarios. The existing maritime wireless communication sys- tems are presented and the development of the state-of-the-art maritime communication systems is surveyed. Furthermore, a hierarchical and integrated maritime network architecture is proposed to satisfy the increasing various classes of services which demand different Quality of Service （QoS）. Finally, the open issues for further development of maritime communications are identified.

关键词： maritime wireless communications dig-ital high frequency communications digital veryhigh frequency communications satellite communi-cations hierarchical and integrated maritime net-work

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