北京邮电大学学报

  • EI核心期刊

北京邮电大学学报 ›› 2005, Vol. 28 ›› Issue (2): 80-83.doi: 10.13190/jbupt.200502.80.zhenglb

• 研究报告 • 上一篇    下一篇

基于信号重构的OFDM频偏跟踪算法的跟踪范围

郑来波1,2,胡健栋1   

  1. 1北京邮电大学 电信工程学院, 北京 100876; 2山东大学 信息科学与工程学院, 济南 250100
  • 出版日期:2005-04-28 发布日期:2005-04-28

The Tracking Range of CFO Tracking Algorithm Based on Signal Reconstruction for OFDM

ZHENG Laibo1,2,HU Jiandong1   

  1. 1.School of Telecommunication Engineering, Beijing University of Postsand Telecommunications, Beijing 100876, China; 2.Information Science and Engineering School, Shandong University, Ji'nan 250100, China
  • Online:2005-04-28 Published:2005-04-28

摘要: 对多径信道下的一种基于时域接收信号重构的正交频分复用系统频偏跟踪算法的跟踪范围进行了进一步的研究,发现这种算法的跟踪范围不是固定不变的。分析表明,影响时域接收信号重构准确性和跟踪范围的主要因素是判决误差,而子载波调制方式、子载波数目以及加性高斯白噪声和信道估计误差都对判决误差有影响,因而也都影响到跟踪范围。通过仿真,得出了子载波的调制方式和子载波的数目是影响频偏跟踪范围的主要因素的结论,并确定了子载波使用二进制调相和16QAM调制的情况下对应于不同子载波数目的频偏跟踪范围。

关键词: 正交频分复用系统, 载波频率偏移, 频偏跟踪

Abstract: The tracking range of a carrier frequency offset (CFO) tracking algorithm for orthogonal frequency division multiplexing (OFDM) systems based on timedomain received signal reconstruction was investigated deeply. It is found that the tracking range of this algorithm is not fixed. Analyses show the decision error is the main factor that affects the timedomain signal re construction accuracy and the tracking range, while the decision error is affected by subcarrier modulation scheme, subcarrier number, additive white Gaussin noise and channel estimate error, so dose the tracking range. We find that subcarrier modulation scheme and subcarrier number are main factors that affect the tracking range. The tracking range at different carrier numbers applying BPSK and 16QAM modulation scheme respectively on subcarriers are determined by simulation.

Key words: OFDM systems, carrier frequency offset, tracking

中图分类号: