计算机应用 ›› 2019, Vol. 39 ›› Issue (11): 3339-3342.DOI: 10.11772/j.issn.1001-9081.2019040682

• 网络与通信 • 上一篇    下一篇

基于自相关增量的载波参数解耦合技术

王思秀, 张蕾, 任艳, 冯长征   

  1. 新疆财经大学 计算机科学与工程学院, 乌鲁木齐 830012
  • 收稿日期:2019-04-22 修回日期:2019-06-23 出版日期:2019-11-10 发布日期:2019-08-21
  • 通讯作者: 王思秀
  • 作者简介:王思秀(1981-),男,江苏徐州人,副教授,硕士,主要研究方向:信号分析、数据处理;张蕾(1974-),女,广东阳江人,讲师,硕士,主要研究方向:网络安全;任艳(1979-),女,新疆乌鲁木齐人,讲师,硕士,主要研究方向:数据处理、多媒体;冯长征(1990-),男,山东滕州人,硕士研究生,主要研究方向:技术经济及管理。
  • 基金资助:
    新疆维吾尔自治区自然科学基金资助项目(2017D01A23)。

Carrier parameter decoupling technique based on autocorrelation increment

WANG Sixiu, ZHANG Lei, REN Yan, FENG Changzheng   

  1. College of Computer Science and Engineering, Xinjiang University of Finance and Economics, Urumqi Xinjiang 830012, China
  • Received:2019-04-22 Revised:2019-06-23 Online:2019-11-10 Published:2019-08-21
  • Supported by:
    This work is partially supported by the Natural Science Foundation of Xinjiang Uygur Autonomous Region (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。

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

Abstract: 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 length α was 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 with α as 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.

Key words: Doppler effect, data-aided, maximum likelihood criterion, carrier synchronization, high-speed mobile communications

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