Improved Channel Estimation for Clipped OFDM Systems

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

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Improved Channel Estimation for Clipped OFDM Systems

更新时间：2025-07-16

- Improved Channel Estimation for Clipped OFDM Systems
- Acta Electronica Sinica Vol. 34, Issue 10, Pages: 1860-1863(2006)
- 作者机构：
  
  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
- 作者简介：
- 基金信息：
- DOI：
  CLC： TN914
- Published：2006
- 稿件说明：
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XIAO Yue, LI Shao-qian, LEI Xia, et al. Improved Channel Estimation for Clipped OFDM Systems[J]. Acta Electronica Sinica, 2006, 34(10): 1860-1863.
DOI：

XIAO Yue, LI Shao-qian, LEI Xia, et al. Improved Channel Estimation for Clipped OFDM Systems[J]. Acta Electronica Sinica, 2006, 34(10): 1860-1863. DOI：

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.

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.

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