Channel estimation for time varying channel based on decision directed technique in OFDM mobile systems

CHEN Hui; CHEN Xiao-guang

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Channel estimation for time varying channel based on decision directed technique in OFDM mobile systems

更新时间：2024-10-14

- Channel estimation for time varying channel based on decision directed technique in OFDM mobile systems
- Issue 9, Pages: 1-5(2006)
- 作者机构：
  
  1. 复旦大学通信科学与工程系
  2. 复旦大学通信科学与工程系,上海,200433
- 作者简介：
- 基金信息：
- DOI：
  CLC： TN919.3
- Published：2006
- 稿件说明：
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CHEN Hui, CHEN Xiao-guang. Channel estimation for time varying channel based on decision directed technique in OFDM mobile systems[J]. 2006, (9): 1-5.
DOI：

CHEN Hui, CHEN Xiao-guang. Channel estimation for time varying channel based on decision directed technique in OFDM mobile systems[J]. 2006, (9): 1-5. DOI：

摘要

提出了一种基于直接判决的OFDM系统的快时变信道估计方法。采用了直接判决算法进行信道估计

并从中选择有效的估计结果

联合导频信号进行信道跟踪。将基于训练序列的信道估计结果作为直接判决算法的初始值

利用传输信号直接判决的统计特性进行了信道估计

并利用改进的导频算法进一步地跟踪信道在时间上的变化。Simulink仿真结果表明

该估计算法适用于时变信道

比基于导频的信道估计方法和基于训练序列的信道估计方法效果都要好。

Abstract

A channel estimation method was proposed based on decision directed technique and pilot tracking for OFDM WLANS with mobile terminals. The result of training sequence based estimation was used as the initialization of decision directed technique. With the help of the decision symbols

the statistical characteristics of the transmitted data via the fading channel were applied for the channel estimation. Some reliable estimated results combined with pilot were used to track the change of the fading channel. The simulation results show that the proposed method has better performance than training sequence based or pilots based channel estimation method.

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