Abstract
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 η - μ and η - μ/inverse Gamma (IG) composite fading channels and the latter one follows κ - μ and κ - μ/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.
Highlights
Due to the low power requirement and enhanced spatial diversity, relay communication has been established as a proven technique for expanding the coverage of wireless networks
NUMERICAL RESULTS we graphically represent the numerical results corresponding to the derived analytical expressions for the secure outage probability for multicasting (SOPM), probability of non-zero secrecy multicast capacity (PNSMC), and ergodic secrecy multicast capacity (ESMC) and observe how the system parameters, e.g., fading severity, shadowing, the number of relays, receivers, and eavesdroppers, etc. influence the multicast system’s secrecy characteristics
The SOPM is depicted as a function of the average SNR of the multicast channels in Figures 2a and 2b in order to observe the impacts due to variation in target secrecy rate
Summary
Due to the low power requirement and enhanced spatial diversity, relay communication has been established as a proven technique for expanding the coverage of wireless networks. Researchers have investigated various statistical characterizations, such as probability density function (PDF) and cumulative distribution function (CDF) of the compound fading channels and their variants under different wireless settings, including fading parameter variation [14]–[17]. As evident in their works, one can more precisely analyze the performances of many wireless systems and networks of interest; in terms of channel capacity (CC), outage probability (OP), coverage probability (CP), and bit error rate (BER).
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