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基于循环平稳特性的OFDM盲同步算法

胡梅霞;张海林   

  1. (西安电子科技大学 综合业务网理论及关键技术国家重点实验室,陕西 西安 710071)

  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2005-04-20 发布日期:2005-04-20

A blind synchronization method based on cyclostationarity

HU Mei-xia;ZHANG Hai-lin

  

  1. (State Key Lab. of Integrated Service Networks, Xidian Univ., Xi'an 710071, China)
  • Received:1900-01-01 Revised:1900-01-01 Online:2005-04-20 Published:2005-04-20

摘要: 正交步分复用系统对同步误差非常敏感.文中提出一种盲同步估计方法,仅利用接收信号具有的二阶循环平稳特性来估计同步信息,不需要导频,具有较高的频谱利用率.通过仿真可以看出这种盲估计算法对信道具有适应性,在多种信道条件下均具有良好的估计性能.

关键词: 正交频分复用, 循环平稳特性, 时频同步

Abstract: Orthogonal frequency division multiplexing (OFDM) systems are very sensitive to the synchronization error. In this paper, we present an algorithm for blind estimation of symbol timing and carrier frequency offsets in wireless OFDM systems. The algorithm exploits only the second-order cyclostationarity of received signals and dose not need additional pilots. The simulation results demonstrate the high performance of the proposed estimator over different channels with the characteristic of its adaptation to channels.

Key words: orthogonal frequency division multiplexing(OFDM), cyclostationarity, time and frequency synchronization

中图分类号: 

  • TN914