Secure transmission in large‐scale cooperative millimetre‐wave systems with passive eavesdroppers

On the Physical Layer Security of Untrusted Millimeter Wave Relaying Networks: A Stochastic Geometry Approach

“…Amidst various PLS methods, cooperative relaying, cooperative jamming (CJ), cooperative beamforming, and a combination of these methods have gained a lot attention in the context of both conventional microwave [23], [24] and mmWave cellular networks [7], [13], [25]. Additionally, a hybrid cooperative relaying and jamming can be implemented for secrecy enhancement using the available knowledge of the main and wiretap links [24].…”

“…Furthermore, secure communication under randomize-and-forward relaying was investigated by Ma et al [13], for both NCE and CE scenarios. In contrast to the aforementioned treatises [7], [10], [13], in our previous work [25], we have proposed a secure scheme for transmission over mmWave channels and designed a new optimal power allocation (OPA) arrangement for untrusted AF relaying systems operating in the face of randomly positioned Eves, while only the LoS link participates in data transmission.…”

“…As a further development, the author teams of [34] and [40] have studied OPA in the presence of multiple-untrusted relays and passive Eves in a conventional microwave cellular network. Additionally, in [25] an OPA scheme was designed for mmWave untrusted relaying networks by only considering the LoS component. Furthermore, Ragheb et al [1] optimized the power allocation for increasing the ESR in the presence of shadow fading in a mmWave network, when a BS transmits confidential messages to a mobile user with the aid of an untrusted relay in the presence of NCEs and obstacles.…”

“…To fill this gap, this treatise considers a range of practical assumptions related to secure mmWave communications by shedding light on untrusted mmWave relaying. Accordingly, we focus our attention on enhancing the PLS of a cooperative mmWave system, where a large-scale antenna-array (LSAA) aided source communicates with a destination relying on a LSAA in the presence of multiple non-colluding untrusted AF relays and NCE [25], [34]. A specific worst-case scenario is considered, where multiple passive Eves cooperate for increasing the equivalent SNR in a scenario reminiscent of [25].…”

“…• We develop a JRP technique for maximizing the instantaneous secrecy rate in both NCE and CE scenarios. We take into account both the LoS and NLoS paths along with the impact of both the main-lobes and side-lobes generated by multiple antennas, which is a more realistic scenario than that of [25]. • Based on the proposed JRP technique, a compact closedform expression is derived for characterizing the ESR performance in a single untrusted relay scenario by using the Laplace transform and incomplete Gamma function integration.…”