具有能量收集的多跳认知双向中继网络中断概率分析

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

为了提高多跳认知中继网络传输效率,延长生存期和降低中断概率,提出基于时分广播协议、译码转发、网络编码和专用信号塔(power-beacon,PB)辅助能量收集等技术的多跳双向传输方案,研究了采用该方案的衬底方式认知中继网络的中断性能,推导了Rayleigh分块衰落信道下次网络的精确和渐近中断概率。理论分析和仿真结果表明,与传统传输方案相比,所提传输方案具有相近的中断性能,但传输效率却远高于传统方案。次网络中断概率随着PB发射功率的增加或者干扰约束的降低而单调下降。合理设置PB位置,次网络端到端容量,子系统数目和能量收集比率有助于提升次网络中断性能。

To enhance transmission efficiency,extend the lifetime and reduce outage probability of multi-hop cognitive relay networks,a multi-hop two-way transmission scheme was proposed based on the technologies such as time division broadcast protocol,decode-and-forward,network coding,power-beacon assisted energy harvesting,and so on.The probability performance of underlay cognitive relay networks adopting the scheme was also studied.The exact and asymptotic outage probability of secondary networks for Rayleigh block fading channel was derived.The theoretical analysis and simulation results show that compared with the conventional transmission scheme,the proposed scheme has similar outage performance,but its transmission efficiency is much higher than conventional scheme;the outage probability is monotonically decreasing with respect to the increase of PB’s transmission power or the decrease of interference constraint,and reasonable settings of PB’s location,end-to-end capacity of secondary networks,number of subsystems and energy harvesting ratio are helpful to improve outage performance of secondary networks.