Improved and efficient EM channel estimation algorithm for MIMO-OFDM systems

XU Peng1; WANG Jin-kuan1; QI Feng2

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Improved and efficient EM channel estimation algorithm for MIMO-OFDM systems

更新时间：2024-10-14

- Improved and efficient EM channel estimation algorithm for MIMO-OFDM systems
- Vol. 32, Issue 1, Pages: 87-93(2011)
- 作者机构：
  
  1. 东北大学信息科学与工程学院
  2. 天主教鲁汶大学通信与微波研究所
- 作者简介：
- 基金信息：
- DOI：
  CLC： TN919.3
- Published：2011
- 稿件说明：
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XU Peng1, WANG Jin-kuan1, QI Feng2. Improved and efficient EM channel estimation algorithm for MIMO-OFDM systems[J]. 2011, 32(1): 87-93.
DOI：

XU Peng1, WANG Jin-kuan1, QI Feng2. Improved and efficient EM channel estimation algorithm for MIMO-OFDM systems[J]. 2011, 32(1): 87-93. DOI：

摘要

针对MIMO-OFDM系统中期望最大化(EM)信道估计算法在高信噪比(SNR)下带来的误差地板(EF)现象

且OFDM符号的数据传输效率随发射天线数的增加而明显降低

提出一种改进的高效EM信道估计算法。该算法首先引入一种准确的等效信号模型并推导出一种修正的EM算法

改善了EM算法在高SNR下的性能;在多个OFDM间利用相位正交导频序列来提高数据传输效率

同时进行联合信道估计以提高估计性能。仿真实验验证了所提算法具有更高的信道估计性能和更高的数据传输效率。

Abstract

For multiple-input multiple-output with orthogonal frequency division multiplexing（MIMO-OFDM） systems

the error floor（EF） phenomenon at high signal noise rate（SNR） was induced by the expectation maximum（EM） channel estimation algorithm.In addition

the data transmission efficiency was declined obviously with the increasing number of transmit antennas.According to these problems

an improved and efficient EM channel estimation algorithm was pro-posed.Firstly

an accurate and equivalent signal model was introduced to derive a modified EM algorithm

which im-proved the estimation performance at high SNR.Next

to enhance the data transmission efficiency and further the esti-mate performance of the proposed algorithm

phase orthogonal pilots sequences and joint estimation were carried out over multiple OFDM symbols respectively.Simulation results show that the proposed algorithm has better estimation performance and higher data transmission efficiency.

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