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应用科学学报 ›› 2012, Vol. 30 ›› Issue (5): 441-447.doi: 10.3969/j.issn.0255-8297.2012.05.001

• 通信工程 • 上一篇    下一篇

不精确帧同步对幅值相位线性插值影响的分析

宋磊1， 李立华1， 高向川2， 裴郁杉1， 王化磊1   

  1. 1. 北京邮电大学泛网无线通信教育部重点实验室，北京100876
    2. 郑州大学信息工程学院，郑州450001
  • 收稿日期:2011-03-23 修回日期:2011-07-12 出版日期:2012-09-24 发布日期:2012-09-25
  • 通信作者: 宋磊，博士生，研究方向：蜂窝及协同系统物理层技术，E-mail：buptsl@gmail.com, songlei@cn.fujitsu.com；
  • 作者简介:宋磊，博士生，研究方向：蜂窝及协同系统物理层技术，E-mail：buptsl@gmail.com, songlei@cn.fujitsu.com；李立华，教授，博导，研究方向：无线通信系统物理层技术，E-mail: lilihua@bupt.edu.cn
  • 基金资助:

    国家自然科学基金(No.NSFC-AF60910160)； 新世纪优秀人才支持计划基金(No.NCET-08-0735)； 国家科技重大专项基
    金(No.2012ZX03003012-004)资助

Effect of Imperfect Frame Synchronization on Linear Interpolation of Amplititude and Phase

SONG Lei1, LI Li-hua1, GAO Xiang-chuan2, PEI Yu-shan1, WANG Hua-lei1     

  1. 1. Key Laboratory of Universal Wireless Communications, Ministry of Education,
    Beijing University of Posts and Telecommunications, Beijing 100876, China
    2. School of Information Engineering, Zhengzhou University, Zhengzhou 450001, China
  • Received:2011-03-23 Revised:2011-07-12 Online:2012-09-24 Published:2012-09-25

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摘要：

在正交频分复用系统中，常见的频域线性插值方法为I 路Q路信道分别进行线性插值(I-Q 插值). 幅值相位线性插值（A-P 插值）由于性能略差且硬件实现复杂度高而很少被采用. 该文在不精确帧同步系统中循环前缀（cyclic prefix, CP）提前截去的情况下，研究了A-P 插值方法受CP提前截去量的影响，并与I-Q 插值进行比较，给出了I-Q 插值和A-P 插值的均方误差通用表达式. 研究结果表明，A-P 插值方法的性能受CP提前截去量的影响很小，仅取决于频域信道相关特性，而I-Q 插值会受CP提前截去量及频域信道相关特性两方面的影响. 因此，当同步算法性能较差而引起较大定时偏差时，也可选择A-P 插值作为频域插值算法.

关键词: 正交频分复用, I-Q 插值, A-P 插值, 循环前缀

Abstract:

In orthogonal frequency division multiplexing (OFDM) systems, a common interpolation method is the linear interpolation in in-phase and quadrature components (I-Q interpolation). Linear interpolation of amplitude and phase (A-P interpolation) is rarely used in practice since it is inferior to I-Q interpolation in terms of performance and computational complexity. For imperfect frame synchronization,  the effect of cyclic prefix (CP) removal prior to the A-P interpolation is studied and compared with I-Q interpolation. A universal expression of mean square error in A-P and I-Q interpolations is given. Analyses show that A-P interpolation mainly depends on frequency correlation of the channels, and is less affected by preact of CP removal, while
I-Q interpolation is affected by both frequency correlation of the channels and preact of CP removal. Thus, A-P interpolation can also be used when the synchronization performance is poor.

Key words: orthogonal frequency division multiplexing (OFDM), I-Q interpolation, A-P interpolation, cyclic prefix

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