北京邮电大学学报

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北京邮电大学学报

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无线弥散信道下OFDM系统中时间同步方案的比较分析

    

  1. 北京邮电大学 电信工程学院 , 北京 100876
  • 基金资助:
    国家自然科学基金资助项目 (60172052); 国家自然科学基金重大研究计划资助项目 (90104018);“十五” 863 重大研究课题资助项目 (2001AA123016) 

A Comparative Analysis on Time Synchronization Schemes in OFDM Systems Based Upon Dispersive Cannel Model

    

  1. Telecommunication Engineering School, Beijing University of Posts and Telecommunications, Beijing 100876, China
  • Supported by:
     

摘要: 首次直接在弥散信道上讨论 OFDM 系统的时间同步模型 ,并在此基础上分析了 OFDM通信系统中的基于训练序列和基于循环前缀的两类时间同步技术的在不同信噪比条件和不同信道冲激响应长度下的同步性能 .

关键词: 正交频分复用, 时间同步 , 循环前缀 

Abstract: Time synchronization of O FDM systems is analyzed directly upon practical channel modeldispersive channel model. Two typical time synchronization and frame-start detecting schemes are surveyed. Theoretical analysis and simulation results suggest that, time and frequency estimators based on only cyclic prefix ( CP) are far inferior to those based upon pilot symbols. Simulation results also suggest that performance of CP based methods cannot be improved by increasing signalto-noise ratio ( SN R) . Hence, appropriately designed pilots are highly necessary for both time and frequency synchronization.

Key words: OFDM, time synchronization, cyclic prefix

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