电信科学 ›› 2015, Vol. 31 ›› Issue (1): 72-76.doi: 10.11959/j.issn.1000-0801.2015030

• 研究与开发 • 上一篇    下一篇

一种改进的TD-LTE下行定时同步算法

白文乐1,2,王旭1,张永梅1,彭木根2   

  1. 1 北方工业大学信息工程学院 北京 100144
    2 北京邮电大学信息与通信工程学院 北京 100876
  • 出版日期:2015-01-15 发布日期:2017-02-21
  • 基金资助:
    国家自然科学基金资助项目;国家科技支撑计划基金资助项目;北京市自然基金资助项目;北京市教委数字内容标准及智能信息处理平台基金资助项目;北京市教委数据采集与可视化处理平台基金资助项目;2014年研究生创新平台建设资助项目

An Improved Algorithm for TD-LTE Downlink Time Synchronization

Wenle Bai1,2,Xu Wang1,Yongmei Zhang1,Mugen Peng2   

  1. 1 School of Information Engineering, North China University of Technology, Beijing 100144, China
    2 School of Information and Communication Engineering,Beijing University of Posts and Telecommunications,Beijing 100876,China
  • Online:2015-01-15 Published:2017-02-21
  • Supported by:
    National Natural Science Foundation Project;Projects in the National Science & Technology Pillar Program;Beijing Municipal Natural Foundation Project;The Digital Content Standards and Intelligent Information Processing Platform Project for the education commission of Beijing, China;The Data Acquisition and Visual Processing Platform Project for the education commission of Beijing, China;The Funding from 2014 Graduate Student Innovation Platform Construction Project

摘要:

针对正交频分复用定时同步实际应用问题,利用循环前缀的统计能量差和统计相关特性,提出了一种改进的TD-LTE下行定时同步算法,减小了计算复杂度,同时能检测循环前缀类型。仿真结果表明,算法在多径衰落信道下,特别是小信噪比条件下,定时同步性能优越,并对归一化频偏和多普勒频移变化具有较强的适应能力。

关键词: TD-LTE, 循环前缀, 下行, 定时同步

Abstract:

Aimed at the application problem of timing synchronization algorithm in orthogonal frequency division multiplexing system, an improved algorithm for TD-LTE downlink time synchronization was proposed. It utilizes statistical energy difference and correlation of cyclic prefix to improve the system performance, which reduces the computational complexity, and can detect the cyclic prefix types. The simulation results demonstrate that the performance of the new method is excellent in multi-path fading channels, especially in the case of small SNR. And it is robust against the normalized frequency offset and Doppler shift.

Key words: TD-LTE, cyclic prefix, downlink, timing synchronization

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