计算机应用 ›› 2010, Vol. 30 ›› Issue (12): 3151-3154.

• 网络与通信 • 上一篇    下一篇

三协作节点的功率分配及其信道容量

张愿1,马社祥2   

  1. 1. 天津理工大学
    2.
  • 收稿日期:2010-06-12 修回日期:2010-07-20 发布日期:2010-12-22 出版日期:2010-12-01
  • 通讯作者: 张愿

Power allocation and channel capacity for cooperative tri-node

  • Received:2010-06-12 Revised:2010-07-20 Online:2010-12-22 Published:2010-12-01
  • Contact: Yuan ZHANG

摘要: 针对多协作用户的功率分配及其信道容量问题,讨论了在三个协作用户的通信模型中,当信道增益固定情况下的功率分配。以信道容量为目标函数,给出了最优的功率分配算法。实验结果表明,当信源节点到目标节点的信道增益大于信源节点到各中继节点的信道增益时,信源节点可以直接传送给目标节点。当信源节点到各中继节点的信道增益的平方与信源节点发射功率的乘积小于相应中继节点到目标节点信道增益的平方与相应中继节点发射功率的乘积时,信源节点可以完全通过中继节点来传送给目标节点,在其它情况下,信源节点可以一部分通过中继节点传输,一部分直接传输到目标节点。

关键词: 协作通信, 功率分配, 信道容量, 中继节点, 信道增益

Abstract: Power allocation for tri-terminal cooperative communication was discussed to predict the power allocation and channel capacity for cooperative multi-terminal when the channel gains are fixed. The optimum power allocation algorithm, with channel capacity as destination function, was given out. The research results show that when the channel gain from source node to destination node is larger than the channel gains from source node to relay nodes, source node can transmit information to the destination node directly. When the product of the square of channel gain from source node to relay node multiplies the power transmitted from source node is smaller than the product of the square of channel gain from relay node to destination node multiplies the power transmitted from relay node, source node can transmit information to the destination node via relay nodes. In other common cases, source node can partly transmit to the destination node via relay nodes and partly transmit information to the destination node directly.

Key words: cooperative communication, power allocation, channel capacity, relay node, channel gain