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Gardner算法在OFDM采样率同步中的应用

王磊 徐大专

王磊, 徐大专. Gardner算法在OFDM采样率同步中的应用[J]. 电子与信息学报, 2011, 33(4): 864-868. doi: 10.3724/SP.J.1146.2010.00134
引用本文: 王磊, 徐大专. Gardner算法在OFDM采样率同步中的应用[J]. 电子与信息学报, 2011, 33(4): 864-868. doi: 10.3724/SP.J.1146.2010.00134
Wang Lei, Xu Da-Zhuan. The Application of Gardner Algorithm to Sampling Rate Synchronization in OFDM Systems[J]. Journal of Electronics & Information Technology, 2011, 33(4): 864-868. doi: 10.3724/SP.J.1146.2010.00134
Citation: Wang Lei, Xu Da-Zhuan. The Application of Gardner Algorithm to Sampling Rate Synchronization in OFDM Systems[J]. Journal of Electronics & Information Technology, 2011, 33(4): 864-868. doi: 10.3724/SP.J.1146.2010.00134

Gardner算法在OFDM采样率同步中的应用

doi: 10.3724/SP.J.1146.2010.00134 cstr: 32379.14.SP.J.1146.2010.00134
基金项目: 

航空科学基金(2009ZC52036)资助课题

The Application of Gardner Algorithm to Sampling Rate Synchronization in OFDM Systems

  • 摘要: 该文将单载波中的Gardner位同步方法应用于OFDM系统中,以解决OFDM系统中的采样率同步问题。同步环路由定时误差提取、环路滤波器和插值器3部分组成。由于采样率偏差基本恒定,本文将环路滤波器用线性最小二乘拟合代替。拟合过程用递推实现以降低运算量。经过分析,最小二乘拟合可使采样率偏差的估计误差随拟合的符号数以立方律减小。但最小二乘拟合在实际中存在两个问题:首先,由于温度等因素,采样率偏差会缓慢变化,并不恒定;其次,随着时间的积累,递推中间变量总会溢出。该文给出了相应的解决方法,只需定期修正递推的中间变量,即可通过限制拟合的时间跨度并定期变换坐标系,解决了以上两个问题。
  • Kan Z, Lin H, and Gang L, et al.. Beyond 3G evolution[J].IEEE Vehicular Technology Magazine.2008, 3(2):30-36[4]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[5]Morelli M, Kuo C C J, and Pun M O. Synchronization techniques for orthogonal frequency division multiple access(OFDMA): a tutorial review[C][J].Proceedings of the IEEE.2007, 95(7):1394-1427[6]Feifei G, Tao C, and Nallanathan A. Scattered pilots and virtual carriers based frequency offset tracking for OFDM systems: algorithms, identifiability, and performance analysis[J].IEEE Transactions on Communications.2008, 56(4):619-629[7]Awoseyila A B, KasparisB C, and Evans G. Robust time-domain timing and frequency synchronization for OFDM systems[J].IEEE Transactions on Consumer Electronics.2009, 55(2):391-399[10]Kim D K, Do S H, and Cho H B, et al.. A new joint algorithm of symbol timing recovery and sampling clock adjustment for OFDM systems[J].IEEE Transactions on Consumer Electronics.1998, 44(3):1142-1149[11]Yang B G, Ben Letaief K, and Cheng R S, et al.. Timing recovery for OFDM transmission[J].IEEE Journal on Selected Areas in Communications.2000, 18(11):2278-2291[12]Gardner F M. Interpolation in digital modemsI. fundamentals[J].. IEEE Transactions on Communications.1993, 41(3):501-507[14] ETSI. EN 300 744-Digital Video Broadcasting (DVB)[S]. 2004.[1]ETSI. EN 300 744-Digital Video Broadcasting (DVB). 2004.
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出版历程
  • 收稿日期:  2010-02-05
  • 修回日期:  2011-02-28
  • 刊出日期:  2011-04-19

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