计算机与现代化

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改进的OFDM系统半盲信道估计算法

  

  1. (江西科技师范大学通信与电子学院,江西 南昌 330013)
  • 收稿日期:2014-10-21 出版日期:2014-12-22 发布日期:2014-12-22
  • 作者简介:陈亮亮(1982-),女,江西吉安人,江西科技师范大学通信与电子学院讲师,硕士,研究方向:信息处理,微电子技术应用; 刘玉莹(1972-),女,江西吉安人,副教授,硕士,研究方向:信息处理; 詹春(1975-),女,江西南昌人,副教授,硕士,研究方向:信息处理。
  • 基金资助:
    江西省教育厅青年科学基金资助项目(GJJ13563)

Improved OFDM Semi-blind Channel Estimation Algorithm

  1. (School of Communication & Electronics, Jiangxi Science and Technology Normal University, Nanchang 330013, China)
  • Received:2014-10-21 Online:2014-12-22 Published:2014-12-22

摘要: 信道估计算法从先验信息的角度,可分为3类:基于参考信号的估计、盲估计和半盲估计。半盲估计是结合盲估计与基于训练序列估计这2种方法优点的信道估计算法。本文首先通过基于导频辅助的半盲信道算法和基于直接判决的半盲信道算法得出信道的估计值,再定义一个置信度函数得出加权系数γ,使基于导频辅助的半盲信道算法和基于直接判决估计算法有效结合起来,有效提高信道估计的精度。

关键词: 半盲信道估计, 导频辅助, 直接判决

Abstract: Channel estimation algorithm can be divided into three categories for priori information: the estimation based on reference signal, blind estimation and semi-blind estimation. Semi-blind estimation is a channel estimation algorithm combined with the advantages of the blind estimation and channel estimation method and the estimation method based on training sequence. This paper obtains the channel estimation value through semi-blind channel estimation algorithm based on pilot assisted and semi-blind channel estimation algorithm based on direct judgment, then defines a confidence function to obtain the weighted coefficient γ, combines the semi-blind channel algorithm based on pilot assisted and the estimation algorithm based on direct judgment to effectively improve the accuracy of channel estimation.

Key words: semi-blind channel estimation, pilot assisted, direct judgment

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