中国邮电高校学报(英文)

中国邮电高校学报(英文) ›› 2010, Vol. 17 ›› Issue (1): 19-24.doi: 10.1016/S1005-8885(09)60419-2

• Wireless • 上一篇    下一篇

Partial channel information feedback mechanism for
FFR-based multi-channel systems

郤伟,尹长川,孙红梅,乐光新   

  1. 1. Laboratory of Wireless Communication Systems and Networks, School of Information and Communication Engineering,
    Beijing University of Posts and Telecommunications, Beijing 100876, China
    2. Communication Technology Laboratory, Intel China Research Center, Beijing 100190, China
  • 收稿日期:2009-01-16 修回日期:1900-01-01 出版日期:2010-02-28
  • 通讯作者: 郤伟

Partial channel information feedback mechanism for
FFR-based multi-channel systems

XI Wei, YIN Chang-chuan, YUE Guang-xin, SUN Hong-mei   

  1. 1. Laboratory of Wireless Communication Systems and Networks, School of Information and Communication Engineering,
    Beijing University of Posts and Telecommunications, Beijing 100876, China
    2. Communication Technology Laboratory, Intel China Research Center, Beijing 100190, China
  • Received:2009-01-16 Revised:1900-01-01 Online:2010-02-28
  • Contact: XI Wei

摘要：

This article puts forward a partial channel state information (CSI) feedback scheme for fractional frequency reuse (FFR)-based orthogonal frequency division multiple access (OFDMA) systems. Efficient CSI feedback strategy plays an important role in opportunistic scheduling because base station (BS) can employ adaptive modulation and coding (AMC) technique to adaptively change transmission rates according to CSI feedback, and therefore the spectrum efficiency can be improved significantly. On the other hand, FFR is a simple but effective technique to improve the throughput of users at cell edge. To exploit opportunistic scheduling in FFR-based OFDMA systems, both users and spectrum are divided into multiple groups in this article, and specific feedback pattern is designed for each user group on each spectrum sub-band. Simulations results prove that the proposed algorithm can reduce the feedback load significantly, while maintain nearly the same performance as the system with full feedback.

关键词:

CSI,;feedback,;FFR,;multiuser;diversity,;OFDMA,;opportunistic;scheduling

Abstract:

This article puts forward a partial channel state information (CSI) feedback scheme for fractional frequency reuse (FFR)-based orthogonal frequency division multiple access (OFDMA) systems. Efficient CSI feedback strategy plays an important role in opportunistic scheduling because base station (BS) can employ adaptive modulation and coding (AMC) technique to adaptively change transmission rates according to CSI feedback, and therefore the spectrum efficiency can be improved significantly. On the other hand, FFR is a simple but effective technique to improve the throughput of users at cell edge. To exploit opportunistic scheduling in FFR-based OFDMA systems, both users and spectrum are divided into multiple groups in this article, and specific feedback pattern is designed for each user group on each spectrum sub-band. Simulations results prove that the proposed algorithm can reduce the feedback load significantly, while maintain nearly the same performance as the system with full feedback.

Key words:

CSI;feedback;FFR;multiuser diversity;OFDMA;opportunistic scheduling

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