一种强鲁棒性的载波参数估计解耦合技术  

A Strong Robust Carrier Parameter Estimation Decoupling Technique

作　　者：徐恒舟 朱海 刘辉 余忠洋 任春晓 XU Heng-zhou;ZHU Hai;LIU Hui;YU Zhong-yang;REN Chun-xiao(School of Network Engineering,Zhoukou Normal University,Zhoukou,Henan 466001,China;Department of Public Security Technology,Railway Police College,Zhengzhou,Henan 450053,China;School of Telecommunications Engineering,Xidian University,Xi’an,Shaanxi 710071,China)

机构地区：[1]周口师范学院网络工程学院,河南周口466001 [2]铁道警察学院公安技术系,河南郑州450053 [3]西安电子科技大学通信工程学院,陕西西安710071

出　　处：《电子学报》2020年第6期1156-1161,共6页Acta Electronica Sinica

基　　金：国家自然科学基金(No.61801527,No.61702071);辽宁省网络安全协同创新中心;河南省高等学校重点科研项目(No.19A520007,No.20A510017,No.20A520046);河南省科技厅科技发展计划项目(No.192102210279,No.182102310034);河南省高等学校青年骨干教师培养计划(No.2018GGJS137)。

摘　　要：在高速移动通信系统中,收发双方往往面临较大多普勒频移和有限导频开销两个问题,从而会严重影响传统载波同步模式(Traditional Carrier Synchronization Pattern,TCSP)的整体性能.为此,本文提出了一种强鲁棒性的载波参数估计解耦合技术(Carrier Parameter Rstimation Decoupling Technique,CPEDT),并应用到传统载波同步模式(CPEDT-TCSP)中.首先在接收端任取一段导频信号进行解调操作,然后对解调信号进行有效延迟长度为α的相关运算,一方面利用该相关运算的结果作频偏估计,另一方面利用取α为导频长度一半的相关运算结果的共轭形式与解调信号一同作最大似然相偏估计.理论分析和仿真结果均表明,考虑修正的数据帧结构,提出的CPEDT-TCSP可以实现传统载波同步模式中频偏估计和相偏估计的解耦合,同时还能够显著降低最大似然相偏估计的复乘运算量.Considering high-speed mobile communications,transceivers always work subject to the large Doppler shift and limited pilot overhead,which severely influences the overall performance of traditional carrier synchronization pattern(TCSP).Thus,a strong robust carrier parameter estimation decoupling technique(CPEDT)is proposed,followed by its application to the TCSP(yielding the CPEDT-TCSP).First,the pilot signals with certain length are selected at receiver to perform the demodulation operation,and then the correlation operation with an effective delay lengthαis performed by the demodulation signals.On the one hand,the frequency offset is estimated by the result of the correlation operation,and on the other hand the conjugate form of the correlation operation result which takesαas half of the pilot lengthαis used to implement maximum likelihood(ML)phase offset estimation.Theoretical analysis and simulation results show that considering a modified data frame,the CPEDT-TCSP can implement the decoupling between both the frequency offset estimation and phase offset estimation in the TCSP,and can also reduce the complex multiplication operations for the ML phase offset estimation.

关 键 词：多普勒效应 数据辅助 最大似然准则 载波同步 高速移动通信 

分 类 号：TP911.23[自动化与计算机技术]