华南理工大学学报(自然科学版) ›› 2007, Vol. 35 ›› Issue (9): 11-15.

• 电子、通信与自动控制 • 上一篇    下一篇

多径衰落分群于载波MIMO-OFDM 系统的性能

喻华文 尹俊勋 赖国庭   

  1. 华南理工大学 电子与信息学院,广东 广州 510640
  • 收稿日期:2006-10-27 出版日期:2007-09-25 发布日期:2007-09-25
  • 通信作者: 喻华文(1976-) ,男,博士,主要从事无线宽带通信、MIMO-OFDM 技术方面的研究. E-mail:yuhuawen@ 163.com
  • 作者简介:喻华文(1976-) ,男,博士,主要从事无线宽带通信、MIMO-OFDM 技术方面的研究.
  • 基金资助:

    国家自然科学基金资助项目(60101002 )

Performance of MIMO-OFDM System ßased on Subcarrier Grouping in Multipath Fading

Yu Hua -wen  Yin jun-xun  Lai Guo-ting   

  1. School of E1ectronic and Information Engineering, South China Univ. of Tech. , Guangzhou 510640 , Guangdong , China
  • Received:2006-10-27 Online:2007-09-25 Published:2007-09-25
  • Contact: 喻华文(1976-) ,男,博士,主要从事无线宽带通信、MIMO-OFDM 技术方面的研究. E-mail:yuhuawen@ 163.com
  • About author:喻华文(1976-) ,男,博士,主要从事无线宽带通信、MIMO-OFDM 技术方面的研究.
  • Supported by:

    国家自然科学基金资助项目(60101002 )

摘要: 在分群空时频MIMO-OFDM 系统中使用群化分组各子载波策略,将信道估计的导频序列离散于各独立于群中,由空频两域扩展到空时频域,降低系统编解码以及导频序列设计的复杂度,并推导非精确信道信息下分群空时频MIMO-OFDM 系统的成对错误概率上界的闭合表达式.理论分析和计算仿真表明,在衰落信道下等间隔的子载波分群策略,可通过减少运算矩阵的规模降低算法复杂度,且具良好的性能.

关键词: MIMO-OFDM 系统, 信道估计, 空时频编码, 衰落, 分群子载波

Abstract:

In the space-time-frequency-coded MIMO-OFDM system , the scheme of subcarrier grouping is adopted to divide the pilot sequence into independent subchannels , and the channel estimation is extended from the spacefrequency dimensions to the space-time-frequency dimensions , thus reducing the complexity of the system codingl decoding and the pilot sequence design. Then , the close-form solution to the Chemoff upper bound of the pairwise error probability is derived for the MIMO-OFDM system with imperfect channel information. The results of the theoretical analysis and numerical simulation show that , in the fading channels , the proposed subcarrier grouping scheme with equal intervals is of good performance because it can attain the results with low coding and decoding complexity by reducing the matrix scale.

Key words: MIMO-OFDM system, channel estimation, space-time-frequency coding, fading , subcarrier grouping