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协同无线通信系统中的分布式自适应功率分配

李国彦 张有光

李国彦, 张有光. 协同无线通信系统中的分布式自适应功率分配[J]. 北京航空航天大学学报, 2012, 38(6): 793-798,803.
引用本文: 李国彦, 张有光. 协同无线通信系统中的分布式自适应功率分配[J]. 北京航空航天大学学报, 2012, 38(6): 793-798,803.
Li Guoyan, Zhang Youguang. Distributed adaptive power allocation in cooperative wireless communication systems[J]. Journal of Beijing University of Aeronautics and Astronautics, 2012, 38(6): 793-798,803. (in Chinese)
Citation: Li Guoyan, Zhang Youguang. Distributed adaptive power allocation in cooperative wireless communication systems[J]. Journal of Beijing University of Aeronautics and Astronautics, 2012, 38(6): 793-798,803. (in Chinese)

协同无线通信系统中的分布式自适应功率分配

基金项目: 国家973计划资助项目(2010CB731803)
详细信息
  • 中图分类号: TN925

Distributed adaptive power allocation in cooperative wireless communication systems

  • 摘要: 在系统总功率一定的情况下,通过在协同节点间进行优化的功率分配以改善系统的接收性能.针对单中继协同传输,推导了节点间最优功率分配因子的闭式表达式,给出了中继节点的激活条件,仅当信道的衰落特性满足该条件时,中继节点才发送信号到目的节点,否则进入空闲状态.多节点协同传输场景下,直接根据系统的输出信噪比难以得到节点间最优功率分配因子的闭式表达式.因此,推导了系统输出信噪比的上界,在此基础上,提出了一种新的功率分配方法.将整个功率分配过程分成两步,采用迭代的方法实现节点间的最优功率分配.仿真结果表明,对于单中继节点的情况,所提出的功率分配方案能够获得约1~2 dB的性能增益,随着参与协同传输的节点数的增大,迭代的功率分配可使系统获得显著的性能提升.

     

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出版历程
  • 收稿日期:  2011-03-21
  • 网络出版日期:  2012-06-30

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