OFDM时频捕获的联合算法

雷俊; 吴乐南

OFDM时频捕获的联合算法

雷俊,
吴乐南

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出版历程
- 收稿日期: 2004-06-03
- 修回日期: 2004-10-29
- 刊出日期: 2006-03-19

A Joint Time and Frequency Acquisition Algorithm for OFDM Systems

Lei Jun,
Wu Le-nan

摘要

摘要: 该文提出了一种OFDM时频捕获的联合算法：利用周期前缀的相关性实现符号粗同步和小数频偏的纠正，并在帧头符号插入差分导频可同时完成帧同步和整数频偏估计。在中短波信道的仿真结果验证了该算法的准确性和实用性。
- 正交频分复用;同步;符号同步;帧同步;频率同步
Abstract: A combined time and frequency acquisition algorithm for OFDM systems is derived in this paper. The proposed technique estimates the symbol beginning and the fractional frequency offset with the periodicity of Cyclic Prefix (CP), and simultaneously achieves the frame synchronization and the integral frequency offset correction based on differential pilot subcarriers in the first symbol of a transmission frame. Simulation results in MW/SW channels indicate the accuracy and practicability of this approach.

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参考文献(1)

European Telecommunications Standards Institute. Digital RadioMondiale (DRM); System Specification. ETSl ES 201 980,2002.[2]Van de Beek J J, Sandell M, Borjesson P 0. ML estimation oftime and frequency offset in OFDM systems[J].IEEE Trans. onSignal Processing.1997,45(7):1800-1805[3]Takahashi K, Saba T. A novel symbol synchronization algorithmwith reduced influence of IS1 for OFDM systems. IEEE GlobalTelecommunications Conference (GLOBECOM'Ol), San Antonio,Texas, USA, 2001, 1 : 524-528.[4]Classen F, Meyr H. Frequency synchronization algorithms forOFDM systems suitable for communication over frequencyselective fading channels. IEEE 44th Vehicular TechnologyConference (VTC'94). Stockholm, Sweden, 1994,3: 1655-1659.[5]Speth M, et al.. Optimum receiver design for OFDM-basedbroadband transmission-Part 11: A case study[J].IEEE Trans. onComm.2001,49(4):571-578[6]Nogami H, Nagashima T. A frequency and timing periodacquisition technique for OFDM systems[J].IEEE 6th Int.Symposium on Personal Indoor and Mobile RadioCommunications (PIMRC'95), Toronto, Canada.1995, 3:1010-1015[7]Hsieh Meng-Han, Wei Che-Ho. A frequency acquisition schemefor OFDM systems. IEEE 7th Int. Symposium on Personal Indoorand Mobile Radio Communications (P1MRC196), Taipei, Taiwan,1996,3: 843-847.[8]Hofmann F, Hansen C, Schafer W. Digital Radio Mondiale (DRM)digital sound broadcasting in the AM bands[J].IEEE Trans. onBroadcasting.2003,49(3):319-328[9]Kurpiers A, Fischer V. Open-source implementation of a DigitalRadio Mondiale (DRM) receiver. IEE 9th InternationalConference on HF Radio Systems and Techniques, Bath, UK,2003: 86-90.[10]雷俊, 吴正南. 改进的 OFDM 符号粗同步算法. 电波科学学报.[11]Watterson C C, Juroshek J J, Bensema W D. Experimentalconfirmation of an HF channel model[J].IEEE Trans. on Comm.1970, 18(6):792-803

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