基于自相关增量的载波参数解耦合技术  

Carrier parameter decoupling technique based on autocorrelation increment

作　　者：王思秀[1] 张蕾[1] 任艳[1] 冯长征 WANG Sixiu;ZHANG Lei;REN Yan;FENG Changzheng(College of Computer Science and Engineering,Xinjiang University of Finance and Economics,Urumqi Xinjiang 830012,China)

机构地区：[1]新疆财经大学计算机科学与工程学院

出　　处：《计算机应用》2019年第11期3339-3342,共4页journal of Computer Applications

基　　金：新疆维吾尔自治区自然科学基金资助项目(2017D01A23)~~

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,从而严重影响传统载波同步模式(TCSP)的整体性能。为此,提出了一种基于自相关增量的载波参数解耦合技术(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去调制操作,然后对去调制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去调制信号一同作最大似然相偏估计。理论分析和仿真结果表明,当导频初始位置为零时,提出的CPEDT-TCSP可以实现TCSP中频偏估计和相偏估计的解耦合,同时能够使最大似然相偏估计的复乘运算量由L降为1,从而更加适用于高速移动通信。In the high-speed mobile communications,transceivers always face large Doppler shift and limited pilot overhead,which severely influence the overall performance of the Traditional Carrier Synchronization Pattern(TCSP).Thus,an autocorrelation increment based Carrier Parameter Estimation Decoupling Technique(CPEDT)was proposed and was applied to the TCSP(CPEDT-TCSP).Firstly,a pilot signal with certain length was selected at the receiving end to perform the operation of modulation removal,and then the correlation operation with an effective delay lengthαwas performed on the signal with modulation removal.The frequency offset was estimated by the result of the correlation operation,and the conjugate form of the correlation operation result withαas half of the pilot length was used to make the maximum likelihood phase offset estimation with the signal with modulation removal.Theoretical analysis and simulation results show that with pilot starting location of zero,the CPEDT-TCSP can implement the decoupling between the frequency offset estimation and the phase offset estimation in the TCSP,and can reduce the computational complexity of complex multiplication from L to 1 in the maximum likelihood phase offset estimation,therefore is more suitable for high-speed mobile communications.

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：TN911.23[电子电信—通信与信息系统]