非再生中继网络的功率优化分配

Optimal Power Allocation in Non-regenerative Relaying Networks

为了降低非再生中继网络的中断概率,研究了基于中断概率最小化的功率分配问题。首先分析了两跳中继传输方式和协同分集传输方式中断概率近似表达式,然后以中断概率最小化作为优化目标,在总功率一定的条件下,建立了非再生中继系统中基于中断概率最小化的功率分配优化模型,通过Lagrange乘数法获得了源节点和中继的最优功率分配。仿真实验表明,与在源节点和中继中采用平均功率分配策略相比,采用基于中断概率最小化的最优功率分配策略,在降低中断概率的同时,也增加了系统的容量。

In order to reduce the outage probability in the non- regenerative relaying network, the power allocation problem based on minimizing the outage probability is studied. Firstly the approximate formulation of the outage probability of two- hop transmission scheme and cooperative diversity transmission scheme is analyzed,then, on the assumption of constant total transmit power, with minimizing network＇s outage probability as the optimization objective,the optimal power allocation model in the non- regenerative relay system is established,based on minimizing outage probability, and the optimal power allocation of the source and the relay by Lagrange multiplier method is obtained. Simulation results show that the optimal power allocation scheme based on minimizing outage probability reduces the outage probability and enhances the system capacity simultaneously ,compared with the equal power allocation scheme between the source and the relay.