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  1. (西安电子科技大学 综合业务网理论及关键技术国家重点实验室,陕西 西安 710071)
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2008-04-20 发布日期:2008-03-28
  • 通讯作者: 郭漪

Iterative channel estimation with noise reduction for MIMO-OFDM systems

GUO Yi;LIU Gang;GE Jian-hua

  1. (State Key Lab. of Integrated Service Networks, Xidian Univ., Xi′an 710071, China)
  • Received:1900-01-01 Revised:1900-01-01 Online:2008-04-20 Published:2008-03-28
  • Contact: GUO Yi

摘要: 为了减小载波间干扰对多输入多输出-正交频分复用系统性能的影响,提出了一种干扰抑制迭代信道估计算法.首先根据频域正交导频估计导频信道频域响应,然后利用DFT内插方法获得信道响应初始估值,进而对其进行迭代消噪滤波处理改善信道估值.由于迭代过程加入了信道预校正以及时域滤波,从而有效地消除了载波间干扰和信道噪声的影响,提高了信道估计的精度.与传统算法相比,该算法避免了复杂的矩阵求逆运算,实现简单.

关键词: 多输入多输出-正交频分复用, 干扰抑制, 信道估计, 导频

Abstract: To eliminate the effect of inter-carrier interference(ICI) on MIMO-OFDM systems, an iterative channel estimation algorithm is proposed. Based on the frequency-domain orthogonal block pilot pattern, the new algorithm obtains a temporal channel response by the discrete Fourier transform(DFT) based channel estimation algorithm, and improves the estimation performance by the iterative channel estimation with noise reduction. With the channel pre-correcting and appropriate time-domain filtering, the new algorithm can effectively eliminate the effect of ICI and channel noises. Furthermore, owing to avoiding the inversion of a large matrix to decouple the inter-antenna interference, the new algorithm can be easily realized compared with the traditional algorithms.

Key words: MIMO-OFDM, noise reduction, channel Estimation, pilot


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