电子学报 ›› 2019, Vol. 47 ›› Issue (7): 1506-1511.DOI: 10.3969/j.issn.0372-2112.2019.07.014

• 学术论文 • 上一篇    下一篇

iNET系统多径衰落信道下的两步频偏估计算法

孙锦华, 石静静   

  1. 西安电子科技大学综合业务网理论及关键技术国家重点实验室, 陕西西安 710071
  • 收稿日期:2018-05-15 修回日期:2018-11-26 出版日期:2019-07-25 发布日期:2019-07-25
  • 作者简介:孙锦华 女,1979年生于陕西西安.西安电子科技大学副教授,硕士生导师,研究方向为突发通信信号处理、无线通信数据传输等.E-mail:jhsun@xidian.edu.cn;石静静 女,1993年生于河南许昌.硕士研究生,研究方向为无线数据传输与通信信号处理、频谱认知网络等.E-mail:sj930523@163.com
  • 基金资助:
    国家自然科学基金(No.61271175)

A Two Step Frequency Offset Estimation Algorithm Using the iNET Preamble in Multipath Fading Channels

SUN Jin-hua, SHI Jing-jing   

  1. State Key Laboratory of Integrated Service Networks, Xidian University, Xi'an, Shaanxi 710071, China
  • Received:2018-05-15 Revised:2018-11-26 Online:2019-07-25 Published:2019-07-25

摘要: 针对多径衰落信道下的载波同步问题,通过分析修正的经典估计器不能同时兼顾估计范围和估计精度的缺陷,提出了一种两步频偏估计算法.对于iNET系统采用的SOQPSK-TG信号,利用前导码的周期性,对多径衰落信道下的频偏估计进行了研究.首先在保持iNET帧结构导频开销不变的前提下,对前导码结构进行改进;然后基于改进Kay算法进行粗估计,再用L&R算法进行细估计;推导了改进前导码结构下的Kay估计子和L&R估计子.理论分析和仿真结果表明,所提同步方案的估计范围扩大了一倍,估计精度也可以达到克拉美罗界.

关键词: 多径衰落, iNET系统, SOQPSK, 频偏估计

Abstract: Aiming at the carrier synchronization problem in multipath channels,a two-step estimation algorithm is proposed by analyzing the defects of the modified classical estimators that can't take account of the range and the accuracy of the estimation simultaneously.For SOQPSK-TG signal used in iNET system,the frequency offset estimation in multipath fading channels is studied by using the periodicity of the preamble.First,the structure of the preamble is improved,keeping the pilot overhead of iNET frame structure unchanged.The improved Kay algorithm is used to ensure the estimation range.And then,the L&R algorithm is used for fine estimation.Also,the modified Kay and L&R estimators are derived under the improved preamble structure.Theoretical analysis and simulation results show that the range of the proposed estimation synchronization scheme is two times the range of the classical estimators,and the estimation accuracy can reach CRB.

Key words: multipath fading, integrated Network Enhanced Telemetry (iNET), Shaped-Offset Quadrature Phase-Shift Keying (SOQPSK), frequency offset estimation

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