基于CAZAC序列的低复杂度抗频偏同步算法

宫丰奎; 文妮; 李果; 高洋

doi:10.11959/j.issn.1000-436x.2021038

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基于CAZAC序列的低复杂度抗频偏同步算法

学术论文 | 更新时间：2024-06-05

- 基于CAZAC序列的低复杂度抗频偏同步算法
- Low-complexity and frequency-offset-robust synchronization algorithm based on CAZAC sequence
- 通信学报 2021年42卷第2期页码：64-71
- 作者机构：
  
  西安电子科技大学ISN国家重点实验室，陕西西安 710071
- 作者简介：
  
  [ "宫丰奎（1979- ），男，山东潍坊人，博士，西安电子科技大学教授、博士生导师，主要研究方向为新一代无线通信关键技术。" ]
  [ "文妮（1996- ），女，湖南娄底人，西安电子科技大学硕士生，主要研究方向为多载波系统、物理层可靠传输。" ]
  [ "李果（1989- ），男，陕西城固人，博士，西安电子科技大学讲师，主要研究方向为大规模MIMO系统、协作通信。" ]
  [ "高洋（1983- ），男，陕西延安人，博士，西安电子科技大学讲师，主要研究方向为复杂信道环境下的高效高可靠通信传输技术。" ]
- 基金信息：
  
  国家自然科学基金青年基金资助项目(61901325);国家自然科学基金青年基金资助项目(62001354);国家重点研发计划基金资助项目(2018YFE0100500);中国博士后科学基金资助项目(2018M640958);陕西省自然科学基础研究计划基金资助项目(2019JQ-658);陕西省技术创新引导专项基金资助项目(2019CGXNG-010);陕西省技术创新引导专项基金资助项目(2020CGXNG-036)
- DOI：10.11959/j.issn.1000-436x.2021038
  中图分类号： TN929.5
- 网络出版日期：2021-02，
  
  纸质出版日期：2021-02-25
- 稿件说明：
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宫丰奎, 文妮, 李果, 等. 基于CAZAC序列的低复杂度抗频偏同步算法[J]. 通信学报, 2021,42(2):64-71.

Fengkui GONG, Ni WEN, Guo LI, et al. Low-complexity and frequency-offset-robust synchronization algorithm based on CAZAC sequence[J]. Journal on communications, 2021, 42(2): 64-71.
宫丰奎, 文妮, 李果, 等. 基于CAZAC序列的低复杂度抗频偏同步算法[J]. 通信学报, 2021,42(2):64-71. DOI： 10.11959/j.issn.1000-436x.2021038.

Fengkui GONG, Ni WEN, Guo LI, et al. Low-complexity and frequency-offset-robust synchronization algorithm based on CAZAC sequence[J]. Journal on communications, 2021, 42(2): 64-71. DOI： 10.11959/j.issn.1000-436x.2021038.

摘要

提出了一种基于恒包络零自相关（CAZAC）序列的低复杂度抗频偏同步算法，适用于突发正交频分复用（OFDM）系统。由CAZAC序列构造一种新型前导序列，利用该序列的组合特性，推导其简化的定时度量函数，进而利用时延相关和对称相关特性实现精确稳定的定时同步。进一步地，基于所构造的前导序列，提出了一种联合循环前缀的加权频率同步方案，可获得更准确的频偏估计。仿真结果表明，无论是否存在频偏，所提算法在高斯信道、多径衰落信道环境下均具有良好的同步性能，并且其计算复杂度低于大多数现有代表性算法。

Abstract

A low-complexity and frequency-offset-robust synchronization algorithm based on CAZAC sequence was proposed

which was suitable for burst OFDM systems.A new preamble sequence was constructed based on the CAZAC sequence

and its simplified timing metric function was derived by using the combination characteristics of the sequence

and then the delay correlation and symmetric correlation characteristics were used to achieve accurate and stable timing synchronization.Furthermore

based on the new constructed preamble sequence

a weighted frequency synchronization scheme combining cyclic prefix was proposed to obtain more accurate frequency offset estimation.Simulation results show that the proposed algorithm has good synchronization performance in both Gaussian channels and multipath fading channels regardless of frequency offset

and its computational complexity is lower than the most existing representative algorithms.

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references

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