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应用科学学报 ›› 2007, Vol. 25 ›› Issue (1): 1-5.

• 论文 •    下一篇

多用户OSTBC-OFDM系统的自适应子载波分配研究

李黎1, 朱光喜1,2   

  1. 1. 华中科技大学电子与信息工程系, 湖北武汉 430074;
    2. 武汉光电国家实验室, 湖北武汉 430074
  • 收稿日期:2005-12-16 修回日期:2006-03-02 出版日期:2007-01-31 发布日期:2007-01-31
  • 作者简介:李黎,博士,研究方向:宽带计算机网络与通信技术,E-mail:lili1976_hust@sina.com;朱光喜,教授,博导,研究方向:多媒体通信,E-mail:gxzhu@mail.hust.edu.cn
  • 基金资助:

    国家自然科学基金(60496310);国家“863”高技术研究发展计划(2003AA12331005)资助项目

Adaptive Subcarrier Allocation for Multi-user OSTBC-OFDM Systems

LI Li1, ZHU Guang-xi1,2   

  1. 1. Department of Electronic and Information Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;
    2. Wuhan National Laboratory for Optoelectronics, Wuhan 430074, China
  • Received:2005-12-16 Revised:2006-03-02 Online:2007-01-31 Published:2007-01-31

PDF

116

被引次数

8

摘要：

研究了基于正交空时分组码的多用户OFDM系统的自适应子载波分配算法.首先从性能角度出发,在保证用户误码率约束的前提下,以总的发射功率最小为目标,推导了具有普遍意义的OSTBC-OFDM的子载波分配通式.考虑到实际应用系统中效率与公平的折中,对各个用户定义相应的速率约束,以增加功率最小为原则,给出了改进的兼顾公平的子载波分配算法的具体步骤.数值仿真结果证明,自适应子载波分配能改善OSTBC-OFDM系统的误码率性能,且兼顾公平的算法需要一定的性能损失为代价.

关键词: 空时分组码, 子载波分配, 正交频分复用, 多天线输入输出

Abstract:

An adaptive subcarrier allocation algorithm for multiuser OSTBC-OFDM system is discussed in this paper. Aimed at minimizing the overall transmit power subjected to meet the target BER, an adaptive subcarrier general allocation algorithm with efficiency-priority is proposed.To achieve a desirable tradeoff between efficiency and fairness, all users are given a guaranteed transmission rate.An amendatory four-step algorithm with fairness constraint is described.Simulation results show that the proposed algorithms can improve BER performance of the OSTBC-OFDM system.

Key words: space time block coding (STBC), multi-input multioutput (MIMO), orthogonal frequency division multiplexing (OFDM), subcarrier allocation

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