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应用科学学报

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反馈时延对多用户系统性能的影响

孙 欢; 王新宇; 王 炎; 尤肖虎   

  1. 东南大学 移动通信国家重点实验室，江苏 南京 210096
  • 收稿日期:2007-06-25 修回日期:2007-08-28 出版日期:2007-11-30 发布日期:2007-11-30

Influence of Feedback Delay on The Performance of Multi-user System

SUN Huan; WANG Xin-yu; WANG Yan; YOU Xiao-hu   

  1. National Mobile Communication Research Laboratory, Southeast University, Nanjing 210096, China
  • Received:2007-06-25 Revised:2007-08-28 Online:2007-11-30 Published:2007-11-30

被引次数

2

摘要： 分析了多用户系统在时变信道模型下用户信息反馈延时对系统性能造成的影响。根据概率论推导了时变信道模型下系统可获得的平均和容量、容量中断概率、系统平均误比特率与反馈延时关系的解析表达式。理论和仿真均证明了在时变信道模型下，系统的反馈延时使多用户系统的性能有很大的下降。

关键词: 多用户调度, 时变信道, 多用户分集, 反馈时延

Abstract: The influence of feedback delay of user channel information on the multi-user system performance is investigated. Analytical results of average sum-rate capacity, outage probability and system bit error rate are derived. Both the theoretical results and the Monte Carlo simulations show that over the time-varying channel, the feedback delay of system does heavily affect the system performance.

Key words: multi-user scheduling, time-varying channel, multi-user diversity, feedback delay