中国邮电高校学报(英文) ›› 2014, Vol. 21 ›› Issue (6): 9-16.doi: 10.1016/S1005-8885(14)60339-3

• Wireless • 上一篇    下一篇

Degrees of freedom for MIMO interference broadcast channels

任海英1,刘元安1,刘芳1,高锦春2,刘凯明1,谢刚1   

  1. 1. 北京邮电大学
    2. 北京邮电大学电信工程学院
  • 收稿日期:2014-07-23 修回日期:2014-09-21 出版日期:2014-12-31 发布日期:2014-12-31
  • 通讯作者: 任海英 E-mail:rhyrhy111@sina.com
  • 基金资助:

    国家科技重大专项;国家自然科学基金;国家自然科学基金;安全生产智能监控北京市重点实验室

Degrees of freedom for MIMO interference broadcast channels

  • Received:2014-07-23 Revised:2014-09-21 Online:2014-12-31 Published:2014-12-31
  • Supported by:

    ; National Natural Science Foundation of China

摘要:

Multiple-input multiple-output (MIMO) interference broadcast channel (IBC) plays an important role in the modern wireless communications. The upper bound of degrees of freedom (DoF) and its corresponding achievable schemes was investigated. However, all the achievable schemes require perfect channel state information at transmitters (CSIT). In absence of CSIT, the DoF value is still unknown. This article mainly focuses on the G-cell K-user MIMO IBC, where there are M antennas at each transmitter and N antennas at each receiver. The transmitters only know channel coherence time internals rather than the values of channel coefficients. The users in the same cell are assumed to be able to share the channel information. Based on a heterogeneous semi-staggered block fading model, a blind interference alignment (IA) scheme was proposed for this scenario. It is shown that when and , a total of DoF can be achieved. The inner bound is same with the decomposition DoF upper bound. Since the complexity is an important performance index to evaluate the achievable scheme, the quantitative analysis for the complexity is presented.

关键词:

blind IA, DoF, IBC, MIMO

Abstract:

Multiple-input multiple-output (MIMO) interference broadcast channel (IBC) plays an important role in the modern wireless communications. The upper bound of degrees of freedom (DoF) and its corresponding achievable schemes was investigated. However, all the achievable schemes require perfect channel state information at transmitters (CSIT). In absence of CSIT, the DoF value is still unknown. This article mainly focuses on the G-cell K-user MIMO IBC, where there are M antennas at each transmitter and N antennas at each receiver. The transmitters only know channel coherence time internals rather than the values of channel coefficients. The users in the same cell are assumed to be able to share the channel information. Based on a heterogeneous semi-staggered block fading model, a blind interference alignment (IA) scheme was proposed for this scenario. It is shown that when and , a total of DoF can be achieved. The inner bound is same with the decomposition DoF upper bound. Since the complexity is an important performance index to evaluate the achievable scheme, the quantitative analysis for the complexity is presented.

Key words:

blind IA, DoF, IBC, MIMO