J4 ›› 2011, Vol. 38 ›› Issue (2): 1-7.doi: 10.3969/j.issn.1001-2400.2011.02.001

• 研究论文 •    下一篇

DF协作系统中基于中断概率的功率分配算法

宋婧;葛建华;李靖   

  1. (西安电子科技大学 综合业务网理论及关键技术国家重点实验室,陕西 西安  710071)
  • 收稿日期:2010-04-09 出版日期:2011-04-20 发布日期:2011-05-26
  • 作者简介:宋婧(1984-),女,西安电子科技大学博士研究生,E-mail: xxsj422@163.com.
  • 基金资助:

    国家科技重大专项基金资助项目(2009ZX03003-003,2009ZX03003-004);中央高校基本科研业务费专项资金资助项目(K50510010017);长江学者和创新团队发展计划资助项目(IRT0852);国家111计划资助项目(B08038)

Power allocation algorithm based on outage probability for DF cooperative systems

SONG Jing;GE Jianhua;LI Jing   

  1. (State Key Lab. of Integrated Service Networks, Xidian Univ., Xi'an  710071, China)
  • Received:2010-04-09 Online:2011-04-20 Published:2011-05-26

摘要:

针对译码转发(DF)协作通信系统中源和中继采用平均功率分配,导致系统资源利用率较低的问题,提出了一种基于中断概率分析的功率分配算法.该算法以降低系统的中断概率为目标,根据用户上行信道和用户间信道的平均信噪比,推导出该模型的系统平均中断概率上下限表达式,并通过黄金分割法迭代出使系统平均中断概率降低的功率分配因子.仿真结果表明,在相同条件下,该功率分配方案比平均功率分配(EPA)方案性能更优.

关键词: 协作通信, DF中继, 黄金分割法, 中断概率, 功率分配

Abstract:

Since the equal power allocation (EPA) between the source node and the relay node in the decode-forward (DF) cooperative communication system results in resource inefficiency, a power allocation algorithm based on outage probability analysis is proposed. This algorithm aims to reduce the average outage probability of the system, in which the upper and lower bound expressions for the system average outage probability of the model are derived according to the average signal to noise ratios of the upper link channels of and the channels between users. The power allocation factor that leads to a lower system average outage probability is obtained by the golden section method. Simulation results show that, all conditions being the same, this power allocation scheme can achieve a better performance than the equal power allocation (EPA) scheme.

Key words: cooperative communications, decode-and-forward (DF) relaying, golden ratio method, outage probability, power allocation