计算机工程 ›› 2011, Vol. 37 ›› Issue (21): 83-85.doi: 10.3969/j.issn.1000-3428.2011.21.028

• 网络与通信 • 上一篇    下一篇

OFDM系统中同步偏差的联合估计算法

李 凯,李慕媛,周 军,叶 凡,任俊彦   

  1. (复旦大学专用集成电路与系统国家重点实验室,上海 201203)
  • 收稿日期:2011-05-10 出版日期:2011-11-05 发布日期:2011-11-05
  • 作者简介:李 凯(1987-),男,硕士研究生,主研方向:无线通信系统;李慕媛,学士;周 军,博士;叶 凡,讲师;任俊彦, 教授
  • 基金项目:
    国家科技重大专项基金资助项目(2009ZX03006-007, 2009 ZX03006-009)

Joint Estimation Algorithm of Synchronization Offset in OFDM System

LI Kai, LI Mu-yuan, ZHOU Jun, YE Fan, REN Jun-yan   

  1. (State Key Lab of ASIC & Systems, Fudan University, Shanghai 201203, China)
  • Received:2011-05-10 Online:2011-11-05 Published:2011-11-05

摘要: 研究基于IEEE 802.11a的正交频分复用(OFDM)系统,分析同步偏差对该系统的影响,提出一种联合估计算法。利用导频序列估计频域中OFDM系统的同步偏差,包括符号定时偏差、载波频率偏差和采样时钟频率偏差。仿真结果证明,该算法的误包率较低,能较好地应用于OFDM系统。

关键词: 正交频分复用, 同步偏差估计, 符号定时偏差, 载波频率偏差, 采样时钟频率偏差

Abstract: This paper investigates the synchronization offset effects in Orthogonal Frequency Division Multiplexing(OFDM) based on IEEE 802.11a system, and proposes a joint estimation algorithm. The joint estimation algorithm comprehensive estimates the synchronization offset only in the frequency domain. When the OFDM system has Symbol Timing Offset(STO), Carrier Frequency Offset(CFO) and Sampling clock Frequency Offset(SFO), the algorithm can obtain the accurate offset information. Simulation results show that the proposed joint estimation algorithm has good performance of Packet Error Rate(PER), and it is well competent in OFDM system.

Key words: Orthogonal Frequency Division Multiplexing(OFDM), synchronization offset estimation, Symbol Timing Offset(STO), Carrier Frequency Offset(CFO), Sampling clock Frequency Offset(SFO)

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