This paper adopts a relay among available secondary relays and exploits non-selected relays as jammers to maintain and secure legitimate secondary source-to-destination communications in energy harvesting underlay cognitive networks (EHUCNs) as their direct communications is in outage. All relays harvest radio frequency energy in signals transmitted by primary and secondary transmitters and consume the harvested energy for their jamming-and-relaying operations. Under Rayleigh fading, peak transmission power restriction, interference power restriction, primary interference and power splitting-based energy scavenging method, we propose exact closed-form formulas of outage and intercept probabilities to promptly assess both security and reliability performances of the suggested relay-and-jammers selection in EHUCNs. The suggested expressions are corroborated by computer simulations. Numerous results indicate the efficacy of the relay-and-jammers selection in improving both security and reliability for source–destination communications. Moreover, the security and reliability performances are saturated at large maximum transmit/interference powers and considerably degraded by the primary interference. Furthermore, the reliability performance can be optimized by splitting appropriately the received power for information decoding and energy harvesting at the relays.

本文采用可用二级中继之间的中继，并利用未选择的中继作为干扰器来维护和保护能量收集底层认知网络 (EHUCN) 中的合法二级源到目标通信，因为它们的直接通信中断。所有中继都从初级和次级发射器传输的信号中收集射频能量，并为干扰和中继操作消耗收集到的能量。在瑞利衰落、峰值传输功率限制、干扰功率限制、一次干扰和基于功率分配的能量清除方法下，我们提出了中断和拦截概率的精确闭式公式，以快速评估建议中继的安全性和可靠性性能 - 和-EHUCN 中的干扰器选择。建议的表达方式得到了计算机模拟的证实。许多结果表明中继和干扰器选择在提高源-目的地通信的安全性和可靠性方面的功效。此外，安全性和可靠性性能在较大的最大发射/干扰功率下饱和，并因主要干扰而显着降低。此外，可以通过适当地分割接收功率以在中继进行信息解码和能量收集来优化可靠性性能。安全性和可靠性性能在较大的最大发射/干扰功率下饱和，并因主要干扰而显着降低。此外，可以通过适当地分割接收功率以在中继进行信息解码和能量收集来优化可靠性性能。安全性和可靠性性能在较大的最大发射/干扰功率下饱和，并因主要干扰而显着降低。此外，可以通过适当地分割接收功率以在中继进行信息解码和能量收集来优化可靠性性能。