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应用科学学报 ›› 2013, Vol. 31 ›› Issue (1): 34-40.doi: 10.3969/j.issn.0255-8297.2013.01.006

• 通信工程 • 上一篇    下一篇

分布式多小区联合传输中的自适应反馈比特分配

翟旭明， 邱玲   

  1. 中国科学技术大学电子工程与信息科学系，合肥230027
  • 收稿日期:2011-08-13 出版日期:2013-01-31 发布日期:2013-01-31
  • 作者简介:翟旭明，博士生，研究方向：无线通信和移动通信中的信号处理、扩频通信和MIMO中的信号处理，E-mail: zhaixm@mail. ustc.edu.cn；邱玲，教授，博导，研究方向：无线通信和移动通信中的信号处理、扩频通信和MIMO中的信号处理，E-mail: lqiu@ustc.edu.cn
  • 基金资助:

    国家科技重大专项课题基金（No.2010ZX03002-003-01）资助

Adaptive Feedback Bit Allocation in Distributed Multi-cell Joint Transmission

ZHAI Xu-ming, QIU Ling   

  1. Department of Electronic Engineering and Information Science, University of Science and Technology of China,
    Hefei 230027, China
  • Received:2011-08-13 Online:2013-01-31 Published:2013-01-31

PDF

1491

被引次数

17

摘要： 基于有限反馈的分布式多小区联合传输系统，提出一种自适应比特分配方案. 通过分析有限反馈造成的系统总速率损失，得到速率损失近似上界与用户分配给各信道的反馈比特数的闭式函数关系. 根据该闭式表达提出了一种自适应反馈比特分配方案，该方案基于不同信道的反馈比特数对速率的影响，在用户各信道之间自适应分配反馈比特数，显著减小了有限反馈带来的速率损失，提高了系统速率. 算法复杂度分析表明，该方案无需增加额外的周期性反馈信息，也无需巨大的计算量，易于在实际系统中实现. 仿真结果验证了该方案的性能.

关键词: 分布式, 多小区联合传输, 有限反馈, 比特分配

Abstract: In this paper, we propose an adaptive feedback bit allocation strategy for distributed multi-cell pre-coding systems with limited feedback. By analyzing the rate loss of multi-cell joint transmission caused by limited feedback, we provide an approximate upper bound as a function of allocated feedback bit for each
channel. Based on this rate loss, an adaptive feedback bit allocation strategy is proposed. The strategy effectively reduces the rate loss due to limited feedback, and thus significantly increases the system rate. Without additional periodical feedback and heavy computation overhead, the proposed strategy is feasible in real systems. Good performance has been shown in simulation.

Key words: distributed, multi-cell joint transmission, limited feedback, bit allocation

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