A Method of Iterative Channel Estimation for OFDM Using Superimposed Training Sequence

ZHOU Jian; TANG You-xi; LIU Hao; HUANG Chuan

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A Method of Iterative Channel Estimation for OFDM Using Superimposed Training Sequence

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- A Method of Iterative Channel Estimation for OFDM Using Superimposed Training Sequence
- Acta Electronica Sinica Vol. 35, Issue 6A, Pages: 165-168(2007)
- 作者机构：
  
  电子科技大学通信抗干扰技术国家级重点实验室,四川,成都,610054
- 作者简介：
- 基金信息：
- DOI：
  CLC： TN929.5
- Published：2007
- 稿件说明：
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ZHOU Jian, TANG You-xi, LIU Hao, et al. A Method of Iterative Channel Estimation for OFDM Using Superimposed Training Sequence[J]. Acta Electronica Sinica, 2007, 35(6A): 165-168.
DOI：

ZHOU Jian, TANG You-xi, LIU Hao, et al. A Method of Iterative Channel Estimation for OFDM Using Superimposed Training Sequence[J]. Acta Electronica Sinica, 2007, 35(6A): 165-168. DOI：

摘要

在瑞利多径衰落信道中

针对叠加训练序列正交频分复用系统的迭代接收机

提出了一种迭代信道估计方法.在迭代译码开始前

利用与数据符号同时发送的训序列得到信道估计初始值

并在每次迭代后利用更新的码字比特先验信息估计接收信号中的数据符号

计算更准确的信道估计值.理论分析给出了每次迭代后的信道估计值的均方误差性能.在多径衰落信道中

通过计算机仿真验证了该迭代信道估计方法的有效性和可靠性.

Abstract

A method of iterative channel estimation is proposed for orthogonal frequency division multiplexing(OFDM) system using superimposed training sequence with iterative receiver.The training sequence is exploited to get an initial channel estimate such that the iterative decoding process can be started.After each decoding iteration

the updated log likelihood ratio(LLR) of a posteriors probabilities on the coded bits are used to estimate the transmitted data symbols

which are fed back and used to improve channel estimates.Theoretical analysis of the mean square error(MSE) of the channel estimates is presented.In frequency selective fading channel

computer simulations of MSE perfonnance of the channel estimation method and bit rrror rate(BER) performance of the system under different conditions are given

which demonstrate the efficiency and validity of the proposed method.

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