北京邮电大学学报

  • EI核心期刊

北京邮电大学学报 ›› 2008, Vol. 31 ›› Issue (6): 42-45.doi: 10.13190/jbupt.200806.42.195

• 论文 • 上一篇    下一篇

MIMO-OFDM有限反馈系统中基于非线性插值的波束成形

黄江春1, 2, 张建华1, 张炎炎1, 张 平1   

  1. (1. 北京邮电大学 无线新技术研究所, 北京 100876; 2. 泛网无线通信教育部重点实验室 北京邮电大学, 北京 100876)
  • 收稿日期:2008-03-03 修回日期:2008-09-02 出版日期:2008-12-31 发布日期:2008-12-31
  • 通讯作者: 黄江春

Nonlinear Interpolation Based Beamforming in MIMO-OFDM Systems with Limited Feedback

HUANG Jiang-chun1, 2, ZHANG Jian-hua1, ZHANG Yan-yan1, ZHANG Ping1   

  1. (1. Wireless Technology Innovation Institute, Beijing University of Posts and Telecommunications, Beijing, 100876, China;
    2. Key Laboratory of Universal Wireless Communication (Beijing University of Posts and Telecommunications), Ministry of Education, Beijing, 100876, China)
  • Received:2008-03-03 Revised:2008-09-02 Online:2008-12-31 Published:2008-12-31
  • Contact: Huang Jiang-Chun

摘要:

为降低多输入多输出正交频分复用(MIMO-OFDM)系统选取波束成形向量的计算复杂度和反馈量,提出一种基于非线性插值的波束成形方法,即在参考位置子载波的波束成形向量内插出非参考位置子载波的波束成形向量. 分析和仿真结果表明,在较小码书的情况下,该方法的性能优于基于量化的最优波束成形方法,并且反馈量和计算复杂度也显著降低;而与基于线性插值和测地线插值的波束成形方法相比,该方法在同样的反馈量下具有更好的性能.

关键词: 波束成形, 有限反馈, 多输入多输出, 非线性插值, 正交频分复用

Abstract:

In order to reduce computational complexity of selecting beamforming vectors and feedback in multiple input multiple output orthogonal frequency division multiplexing (MIMO-OFDM) systems, a nonlinear interpolation based beamforming scheme is proposed, the principle of which is to interpolate beamforming vectors of the non-pilot subcarriers via that of the pilot subcarriers. Analysis and simulation results illustrate that the proposed scheme outperforms the optimal beamforming with quantization as well as significant feedback and computational complexity reduction in the case of small size of codebook, while provides better performance than the existing linear interpolation and geodesic interpolation based beamforming methods with the same feedback.

Key words: Beamforming, limited feedback, multi-input multi-output, nonlinear interpolation, orthogonal frequency division multiplexing

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