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一种有效的LTE下行残留频偏估计方法


  摘 要:针对LTE系统对载波频偏敏感的问题,提出了一种适用于LTE下行的残留频偏估计方法。该方法利用时域相邻的主同步信道(PSCH)和辅同步信道(SSCH)的频域信道估计值的共轭相关运算来估计载波频率的残留偏差。理论分析表明,该算法估计范围小,但估计精度高,且运算量少,实现复杂度低。同时仿真验证了该算法在高斯加性信道(AWGN)和多径衰落信道下均有良好的性能。

  关键词:长期演进; 正交频分复用; 载波间干扰; 小区搜索; 残留频偏估计

  中图分类号:TN929.5文献标志码:A

  文章编号:1001-3695(2010)06-2290-04

  doi:10.3969/j.issn.1001-3695.2010.06.084

  Effective estimation method to residual carrier frequency offset for LTE downlink

  WEI Ziheng1, LI Bi1,2, LIN Tusheng1

   (1.School of Electronic & Information Engineering, South China University of Technology, Guangzhou 510640, China; 2.School of Informations, Guangdong University of Foreign Studies, Guangzhou 510420, China)

  Abstract:According to LTE systems being very sensitive to carrier frequency offset,this paper proposed a novel residual carrier frequency offset estimation method for LTE downlink.Estimated the residual carrier frequency offset by conjugate correlating the frequencydomain channel estimation of PSCH and that of SSCH which were adjacent symbols in timedomain.Theoretical analysis shows the proposal algorithm is highly accuracy though with limited range estimation.Moreover,it keeps very low computational cost and reduces the implementation complexity.Simulation results verify the proposal algorithm with good performances both in AWGN and multipath fading channel.

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