具有能量收集的认知双向协作中继网络中断概率分析

Outage probability analysis of cognitive two-way cooperative relay networks with energy harvesting

为了延长认知中继网络的生存时间和降低中断概率,提出了具有多主接收端的专用信号塔(PB,Power-beacon)辅助能量收集认知双向协作中继网络,并研究了采用译码转发模式和机会中继选择策略的衬底式认知网络中断性能。网络中次用户发射功率由收集自PB的能量和主接收端的干扰约束决定。推导了Rayleigh块衰落信道下次网络的精确中断概率,结果表明增大PB发射功率或主网络干扰约束将使中断概率单调下降。此外,还推导了有干扰约束和无干扰约束的次网络渐近中断概率,研究了中断饱和现象,PB位置对中断概率的影响,以及主接收端和中继数量、次网络端到端容量以及能量收集比率与中断概率之间的关系。仿真结果验证了理论推导。

To extend the life time and reduce the outage probability of cognitive relay networks,a cognitive twoway relay networks with power-beacon(PB)assisted energy harvesting and multiple primary receivers was proposed,and the outage performance of underlay cognitive multiple relays secondary networks adopting decodeand-forward mode and opportunistic relay selection strategy was studied,wherein the transmission power of secondary users was subject to the energy harvested from PB and the interference constraint from the primary receivers.The exact outage probability of secondary networks for Rayleigh block fading channel was derived,and the results indicated that the outage probability was monotonically decreasing with the increase of PB's transmission power or primary network's interference constraint.Furthermore,the asymptotic outage probability of secondary networks with or without interference constraint was derived,and the outage saturation phenomenon,the impact of PB's location on outage probability,and the relationship between outage probability and the number of primary receivers and relays,secondary networks' end-to-end capacity and energy harvesting ratio were studied.Simulation results validated the theoretical derivation.