一种抗频偏的时间精同步方法及性能分析

王磊; 徐大专

doi:10.3724/SP.J.1146.2010.00346

一种抗频偏的时间精同步方法及性能分析

doi: 10.3724/SP.J.1146.2010.00346

王磊,
徐大专

基金项目:

航空科学基金(2009ZC52036)资助课题

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- 被引次数: 0
出版历程
- 收稿日期: 2010-04-06
- 修回日期: 2010-07-15
- 刊出日期: 2011-02-19

An Anti Frequency Offset Fine Time Synchronization Method and Its Performance Analysis

摘要

摘要: 该文导出了互相关时间精同步的性能随频率偏移和信噪比变化的表达式，并提出一种受频偏影响较小的精同步方法。该文对同步性能表达式进行分析，得到在某一频偏下同步序列长度的上限值。新方法将同步序列分段，每段和接收信号分别作互相关，将各段的相关值延时相加作为同步的度量。通过仿真将新方法和其它时间同步方法进行了对比。仿真结果表明，新方法可以大大提高系统抗频偏的能力。
- 无线通信 /
- 时间同步 /
- 互相关 /
- 频率偏移
Abstract: This paper analyzes the performance of fine time synchronization which using cross correlation method and gives the relationship between its performance and the parameters of carrier frequency offset and signal to noise ratio. Then this paper proposal a new fine time synchronization method which is less affected by frequency offset. This paper gives the upper limit for synchronization sequence length in a certain frequency offset. In new method, synchronization sequence is split into several parts and correlates with receive signal separately. The delayed correlation values for every segment are added to get the synchronization metric. The simulation results demonstrate that the performance of the new method is robust against frequency offset.
- Wireless communication /
- Time synchronization /
- Cross-correlation /
- Frequency offset

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参考文献(1)

[1] Schmidl T and Cox D. Robust frequency and timing synchronization for OFDM [J].IEEE Transactions on Communications.1997, 45(12):1613-1621 [2] 胡艳龙, 龚广伟, 范波等. 基于重复PN序列的NC-OFDM时间同步算法[J]. 通信对抗, 2009, (1): 29-32. Hu Yan-long, Gong Guang-wei, and Fan Bo, et al.. Timing synchronization algorithm of NC-OFDM based on PN repeated sequences [J]. Communication Countermeasures, 2009, (1): 29-32. [3] Van de Beek J J, Sandell M, and Borjesson P O. ML estimation of time and frequency offset in OFDM systems [J].IEEE Transactions on Signal Processing.1997, 45(7):1800-1805 [4] 罗仁泽, 高頔, 伍裕江等. 保护带叠加最佳训练序列时间同步方法 [J]. 电子学报, 2009, 37(7): 1584-1587. Luo Ren-ze, Gao Di, and Wu Yu-jiang, et al.. Timing synchronization scheme using superimposed perfect training in guard band [J]. Acta Electronica Sinica, 2009, 37(7): 1584-1587. [5] Yang B G, Letaief K, and Cheng R, et al.. Timing recovery for OFDM transmission [J].IEEE Journal on Selected Areas in Communications.2000, 18(11):2278-2291 [6] Ruan M, Shi Z N, and Reed M. Training symbol based coarse timing synchronization in OFDM systems [J].IEEE Transactions on Wireless Communications.2009, 8(5):2558-2569 [7] Speth M, Classen F, and Meyr H. Frame synchronization of OFDM systems in frequency selective fading channels [C]. IEEE 47th in Vehicular Technology Conference, Phoenix, USA, 1997, 3: 1807-1811. [8] Almuzaini K K and Gulliver T A. A New Time Synchronization Technique for OFDM Systems [C]. IEEE 68th in Vehicular Technology Conference, Calgary, Canada, 2008: 1-5. [9] Speth M, Fechtel S, and Fock G, et al.. Optimum receiver design for OFDM-based broadband transmission-part II: A case study [J].IEEE Transactions on Communications.2001, 49(4):571-578 [10] Tang Shi-gang, Peng Ke-wu, and Gong Ke, et al.. Robust Frame Synchronization for Chinese DTTB System [J].IEEE Transactions on Broadcasting.2008, 54(1):152-158

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