解码转发单向多中继网络的能效与谱效权衡

Tradeoff Between Energy Efficiency and Spectrum Efficiency in Decode-and-Forward One-Way Multi-Relay Networks

为优化解码转发(DF)单向多中继网络的能量效率(EE)与频谱效率(SE),提出一种中继选择与功率分配联合优化方法。在DF单向多中继传输网络中,选择能够使EE最大的中继节点作为最佳中继并进行最优功率分配,给出最优功率分配下EE和SE的表达式,以提高SE为目标求出最优功率分配因子,将其代入EE的计算表达式后,将节点总功率作为优化变量以实现EE最大化,在此基础上,分析中继相对位置改变时EE和SE的变化趋势。仿真结果表明,相比随机中继等功率分配以及仅最优功率分配等方法,该方法具有更高的EE和SE。

In order to optimize the Energy Efficiency(EE)and Spectrum Efficiency(SE)of Decode-and-Forward(DF)one-way multi-relay networks,this paper proposes a joint optimization method for relay selection and power distribution of DF one-way multi-relay networks.In the DF one-way multi-relay transmission network,the relay node that can maximize EE is selected as the best relay,and the optimal power distribution is carried out.The expression of EE and SE in the case of the optimal power distribution is given,and the optimal power distribution factor is calculated to improve SE.The obtained power distribution factor is then substituted into the EE expression,and the total power of the node is taken as the optimization variable to maximize the EE.On this basis,the changes of EE and SE along with the relative position of relay are analyzed.The simulation results show that the proposed method has higher EE and SE than the existing random selection-based equal power distribution method and the optimal power distribution method.