The secrecy performance of realistic wireless multicast scenarios can be significantly deteriorated by the simultaneous occurrence of multipath and shadowing. To resolve this security threat, in this work an opportunistic relaying-based dual-hop wireless multicast framework is proposed in which the source dispatches confidential information to a bunch of receivers via intermediate relays under the wiretapping attempts of multiple eavesdroppers. Two scenarios, i.e. non-line of sight (NLOS) and line of sight (LOS) communications along with the multiplicative and LOS shadowing are considered where the first scenario assumes eta-mu and eta-mu/inverse Gamma (IG) composite fading channels and the latter one follows kappa-mu and kappa-mu/IG composite fading channels as the source to relay and relay to receiver's as well as eavesdropper's links, respectively. Secrecy analysis is accomplished by deriving closed-form expressions of three familiar secrecy measures i.e. secure outage probability for multicasting, probability of non-zero secrecy multicast capacity, and ergodic secrecy multicast capacity. We further capitalize on those expressions to observe the effects of all system parameters which are again corroborated via Monte-Carlo simulations. Our observations indicate that a secrecy tradeoff between the number of relays and number of receivers, eavesdroppers, and shadowing parameters can be established to maintain the admissible security level by decreasing the detrimental influences of fading, shadowing, the number of multicast receivers and eavesdroppers.
翻译:现实的无线多播情景的保密性会因同时出现多路和影子而大大恶化。为了解决这一安全威胁,在这项工作中,提议了一个基于机会式转发的双跳双跳型无线多播框架,在多个窃听者的窃听尝试下,通过中间继电器向一系列接收器发送机密信息。两种情景,即非视线(NLOS)和视线(LOS)通信,以及多种复制和近距离影(LOS),在考虑第一种情景假设为eta-mu和eta-mu/invers Gamma(IG)复合淡化频道和后一种基于机会式转发的双跳双跳型无线无线的多发式多发式框架时,以及后一种基于机会的多发式转发式转发器框架,作为向接收器转发和窃听器连接的中继器的传输和传输渠道。通过多种多发式播音、非零保密多发式多发式传输能力的概率,以及后继式保密性保密频道(IG)的频度。我们进一步利用了安全性交易中继器的变变码,这些系统,从而显示了我们安全性交易中继器的变码的变码。