【摘要】 针对能量受限认知中继网络生存期短和中断概率高的问题,提出一种具有多个主接收端、多个次目的节点、次网络直接链路和次网络节点硬件损伤的功率信标(PB)辅助能量收集认知协作中继网络,推导出在瑞利块衰落信道下采用机会中继选择策略和选择合并方式的次网络精确和渐近中断概率,并对理论分析结果进行蒙特卡洛(Monte Carlo)仿真验证。研究结果表明:主接收端干扰约束或者PB发射功率的提升会使中断概率单调下降并趋于饱和;中断概率随着次网络节点硬件损伤水平、主接收端数目和次网络端到端信道容量的增大而增加,并随着中继和次目的节点数目的增多而减小;恰当设定能量收集比率能有效降低中断概率。更多还原

【Abstract】 Aiming at the problem of short lifetime and high outage probability of energy-constrained cognitive relay networks, a cognitive cooperative relay networks with multiple primary receivers,multiple secondary destination nodes,direct link and power-beacon(PB) assisted energy harvesting was proposed. The exact and asymptotic outage probabilities of secondary networks for Rayleigh block fading channel were derived by adopting the opportunistic relay selection strategy and selection combining scheme. All the analytical results were validated by Monte Carlo simulation.The results show that with the increase of the primary receivers’ interference constraint or PB’s transmission power, the outage probability monotonically decreases until saturation is reached. The outage probability increases with the increase of secondary nodes’ hardware impairments level, the number of primary receivers and end-to-end channel capacity of secondary networks. The outage probability reduces with the increase in the number of relays and secondary destination nodes. Appropriate setting of energy harvesting ratio can effectively reduce the outage probability.更多还原