Performance Analysis of Physical Layer Security of Opportunistic Scheduling in Multiuser Multirelay Cooperative Networks

Abstract

Abstract:In this paper, we study the physical layer security (PLS) of opportunistic scheduling for uplink scenarios of multiuser multirelay cooperative networks. To this end, we propose a low-complexity, yet comparable secrecy performance source relay selection scheme, called the proposed source relay selection (PSRS) scheme. Specifically, the PSRS scheme first selects the least vulnerable source and then selects the relay that maximizes the system secrecy capacity for the given selected source. Additionally, the maximal ratio combining (MRC) technique and the selection combining (SC) technique are considered at the eavesdropper, respectively. Investigating the system performance in terms of secrecy outage probability (SOP), closed-form expressions of the SOP are derived. The developed analysis is corroborated through Monte Carlo simulation. Numerical results show that the PSRS scheme significantly improves the secure ability of the system compared to that of the random source relay selection scheme, but does not outperform the optimal joint source relay selection (OJSRS) scheme. However, the PSRS scheme drastically reduces the required amount of channel state information (CSI) estimations compared to that required by the OJSRS scheme, specially in dense cooperative networks.

Exploiting Opportunistic Scheduling for Physical‐Layer Security in Multitwo User NOMA Networks

“…And the channel noise is followed by Y ∼ CN(0, 2 Y ). We also assume that the source perfectly knows the channel state information (CSI) of all legitimate users and eavesdropper, as in [11,35].…”

“…The proposed user selection process is conducted through the channel state information (CSI) estimation/calculation system. Thus, this process is carried out before the data communication process as in [11,35]. In this paper, we propose the BSNBSF user selection scheme to maximize the secrecy capacity at N and F , respectively.…”

“…We also assume the all nodes have the same noise variance. Let = S / 2 present the transmit SNR as in [11,22]. The SOP of a user can be defined as the probability that the instantaneous secrecy capacity of the user falls below a predefined target data rate [23].…”

“…Physical layer security (PLS) is one of the possible solutions against the attack of the malicious user. More specifically, from the information-theoretical aspect, the message can be confidentially transmitted if the main channel (between legitimate users) and the eavesdropper channel (between a legitimate user and an eavesdropper) can be controlled so that the legitimate user can decode the received message successfully while the eavesdropper is not able to decode their intercepted message [11]. It is shown that PLS is on the cutting edge of the 2 Wireless Communications and Mobile Computing technique of security in wireless communication to prevent eavesdropping attacks [12][13][14].…”

A Comprehensive Survey on Cooperative Relaying and Jamming Strategies for Physical Layer Security

“…Shim et al in [144] consider a generalized scenario in a multirelay network where a cluster of M sources transmit messages to a cluster of N relays, in the presence of a single eavesdropper and a single destination. The eavesdropper is assumed to utilize either MRC or SC to combine the signal during source-to-relay and relay-to-destination transmission phases.…”