协同分集中的联合功率优化分配

在慢衰落信道中，协同分集是一种新的空间分集方式。在总功率一定的情况下，各个协同节点如何分配功率使性能最优。基于每一个协同节点到目的端节点信道功率和噪声功率是互不相同的。将所有路径的信道和噪声功率进行综合考虑，根据其各自的大小，综合运用注水原理。提出了在目的端最大比合并和发送端最大比合并的联合优化功率分配方法。通过在高斯信道和Rayleigh信道下的仿真,表明：该联合优化算法能够使性能得到提高。同时为降低复杂度，一种次优的算法被提出。

The Joined Optimization Power Allocation Under AF Cooperative Diversity

In the slow fading channel,the cooperative diversity is a new space diversity. Based on the fact that the power of the channles and noises of the cooperative nodes may be different to the destination node. A new method called jointed power allocation was put forward , which is maximum ratio combining at the destination node and the transmit-maximum ration combining at each transmiter node with water-filling synthetically. The simulations under Gaussian and Rayleigh channel were carried out. The analytical result and simulations showed that the performance can be improved by this method. At the same time, a suboptimal method was put forward to reduce the complexity.