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.
Highlights
Physical layer security (PLS) techniques have been emerging as a robust solution to prevent information eavesdropping for future wireless networks, especially for cooperative relaying networks [1,2,3,4]
We have investigated the secrecy performance of opportunistic scheduling in multiuser multirelay cooperative networks
We have proposed the proposed source relay selection (PSRS) scheme, which aims to improve the physical layer security (PLS) of the considered cooperative relaying networks
Summary
Physical layer security (PLS) techniques have been emerging as a robust solution to prevent information eavesdropping for future wireless networks, especially for cooperative relaying networks [1,2,3,4]. Considering a downlink transmission from a base station to multiple destinations via the assistance of a DF relay in the presence of multiple eavesdroppers, the authors in [18] investigated the secrecy performance of the maximal ratio transmission scheme when the eavesdropper’s channel state information (CSI) is available and is not available at the relay, respectively. Secure multiuser communications in wireless sensor networks were investigated in [26], where the switch-and-stay combining technique was adopted to reduce the scheduling complexity and extend the battery lifetime of the sensor nodes, while the transmit antenna selection technique and cooperative jamming were used to achieve satisfactory secrecy performance. We consider an uplink scenario of multiuser multirelay cooperative networks, where a selected source communicates with a destination via the help of a selected relay in the presence of one eavesdropper.
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