一种有效的LTE下行残留频偏估计方法  

Effective estimation method to residual carrier frequency offset for LTE downlink

作　　者：魏子恒[1] 李碧[1,2] 林土胜[1] 

机构地区：[1]华南理工大学电子与信息学院,广州510640 [2]广东外语外贸大学信息学院,广州510420

出　　处：《计算机应用研究》2010年第6期2290-2293,共4页Application Research of Computers

基　　金：广州市科技计划项目(2009J1-C401)

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。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.

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 

分 类 号：TN929.5[电子电信—通信与信息系统]