电子学报 ›› 2006, Vol. 34 ›› Issue (10): 1860-1863.

• 论文 • 上一篇    下一篇

限幅OFDM的一种信道估计优化方法

肖 悦, 李少谦, 雷 霞, 唐友喜   

  1. 电子科技大学通信抗干扰技术国防重点实验室,四川成都 610054
  • 收稿日期:2006-07-25 修回日期:2005-12-10 出版日期:2006-10-25 发布日期:2006-10-25

Improved Channel Estimation for Clipped OFDM Systems

XIAO Yue, LI Shao-qian, LEI Xia, TANG You-xi   

  1. National key Lab of Communication,University of Electronic Science and Technology of China,Chengdu,Sichuan 610054,China
  • Received:2006-07-25 Revised:2005-12-10 Online:2006-10-25 Published:2006-10-25

摘要: 在OFDM 系统中,限幅常用于抑制信号的峰平比,而限幅会引入额外的限幅噪声,以致干扰数据和导引符号,恶化传输性能.本文针对限幅OFDM系统,提出一种基于导引符号的限幅噪声消除算法.该算法在插入导引符号之前,滤除位于导引位置的限幅噪声,从而改善信道估计性能.在此基础上,本文还提出了利用迭代算法以进一步提高信道估计精确度.本文对所提出的限幅噪声消除算法及迭代算法进行了仿真验证,结果表明,新算法能够明显改善信道估计,优化传输性能.

关键词: 限幅, 正交频分多址, 导引符号, 信道估计

Abstract: In OFDM systems,clipping is often used to control the high peak-to-average power ratio (PAPR) of signal.Clipping will introduce additional clipping noise on both data and pilot symbols,so as to degrade the system performance.A new technique is proposed to cancel the clipping noise on pilot symbols for clipped OFDM systems.The new technique is based on directly filtering the clipping noise on the positions of pilot symbols before they are inserted into the data.Based on the new technique,an iterative method is proposed to further improve the performance of channel estimation.The simulation results are also given.It is shown that the new technique and the iterative method can effectively improve the performance of channel estimation,so as to improve the system performance.

Key words: clipping, OFDM, pilot symbol, channel estimation

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