Secrecy Analysis in DF Relay Over Generalized-$K$ Fading Channels

Abstract

In this paper, we analyze the secrecy performance of the decode-and-forward (DF) relay system in generalized-K fading channels. In a typical four-node communications model, a source (S) sends confidential information to a destination (D) via a relay (R) using DF strategy in two time slots, while an eavesdropper (E) wants to overhear the information from S to D over generalized-K fading channels. To be more realistic, we assume that E can receive the signals of two time slots, and there is no direct link between S and D because of heavy fading. Based on those assumptions, we derive closed-form expressions for the secrecy outage probability (SOP) and ergodic secrecy capacity (ESC) by using a tight approximate probability density function of the generalized-K model. Then, asymptotic expressions for the SOP and ESC are also derived in the high signal-to-noise ratio region, not only because we can get some insights about SOP and ESC, but also because expressions for SOP and ESC can be simplified significantly. The single relay system is subsequently extended into a multi-relay system, where the asymptotic SOP analysis of three proposed relay selection strategies is investigated. Further, the security-reliability tradeoff analysis in the multi-relay system is also presented given that S adopts a constant code rate. Finally, the Monte-Carlo simulation is used to demonstrate the accuracy of the derived closed-form expressions.

Secure Cognitive Radio-Enabled Vehicular Communications under Spectrum-Sharing Constraints

“…PHY-security aspects have been thoroughly investigated in the literature for various network scenarios under different fading channels without considering the cognitive framework [11][12][13][14][15][16][17][18][19][20]. Furthermore, the authors in [21] have proposed a machine-learning-based method to locate the vehicles generating jamming signals by monitoring the physical channel parameters of the vehicles in the vehicular networks.…”

“…As such, the instantaneous CSI of the eavesdropper can be available at the transmitter via a feedback channel for the time slot where it is being served. Therefore, from this information and assuming eavesdropper CSI does not change under the assumption of quasi-stationary channel for a short duration, statistical CSI of the passive eavesdropper can be available at the trusted node, for the time slots where it is not being served [17][18][19][20][21][22][23][24][25][26][27][28][29][30]. The detail of the interference constraints is discussed later in this section.…”

Secrecy Performance Analysis of a Cognitive Network for IoT over k‐μ Channels

“…By changing its parameters, it can represent many channel models. To account for this, a large section of the literature has studied the transmission performance and security of the generalized fading channels [8][9][10][11][12][13][14][15]. In [8], Lei et al employed two mathematical forms to complete the derivation of the lower limit of SOP and strictly positive secrecy capacity (SPSC).…”

“…Elsewhere, the ability of such a channel to resist active eavesdropping was investigated by deriving the ASC in [9]. Using a system model of decode-and-forward (DF) relay cooperation over generalized-K channels, the exact and approximate theoretical expressions of SOP and ESC were evaluated in [10]. Using channels with the premise that the main link follows α-μ distribution and the eavesdropping link was modelled as k-μ distribution, the analytical expressions of ASC, SOP, and SPSC were derived in [11].…”

Performance of maximal ratio transmission over generalised‐K fading channels

“…[6] derive the SER and outage probability (OP) for decode‐and‐forward (DF) relaying multi‐hop Internet‐of‐Things (IoT) networks over fading channels. DF relaying over fading channels is considered in [7] to analyse secrecy outage and capacity, and similarly simultaneous wireless information and power transfer (SWIPT) system is investigated for fading channels to explore the secrecy OP [8]. Blagojevic and Cvetkovic [9] analyse OP of DF energy harvesting relaying over fading channels.…”