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应用科学学报

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OFDM系统中离散导频的采样钟和残留频偏联合估计算法

威力;徐友云;蔡跃明;王登林   

  1. 1. 解放军理工大学 通信工程学院，江苏 南京 210007；2. 61541部队，北京 100094
  • 收稿日期:2006-07-03 修回日期:2006-09-26 出版日期:2007-03-20 发布日期:2007-03-20

Joint Estimation of Sampling Clock and Residual Frequency Offset of OFDM System Based on Discrete Preamble

WEI Li;XU You yun;CAI Yue ming;WANG Deng lin   

  1. 1. Institute of Communication Engineering, PLA University of Science and Technology, Nanjing 210007, China; 2. No.61541 Army, Beijing 100094, China
  • Received:2006-07-03 Revised:2006-09-26 Online:2007-03-20 Published:2007-03-20

被引次数

2

摘要： 利用最大似然估计理论推导出了基于离散导频的近似最优及次优估计算法，分析了估计算法的性能，并在此基础上提出了离散导频的设计方法.同时给出了一种快速精确的采样钟跟踪方案.仿真表明，提出的算法具有很好的估计性能.

关键词: 采样钟, 残留频偏, 离散导频

Abstract: Estimation and compensation of sampling clock and residual frequency offset in OFDM systems are an important issue. Using discrete preamble, we derive near optimal and sub optimal estimation based on the maximum likelihood (ML) estimation theory, and then analyze the estimation performance and discuss the design of discrete preamble to achieve best estimation performance. We also give a closed loop scheme for accurate and fast sampling clock tracking. Validity of the proposed method is verified in simulation.

Key words: sampling clock, residual frequency offset, discrete preamble