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International Conference on Advanced Technologies for Communications

Physical layer security over Dual-Hop Asymmetric Fading Channels

Pham Ngoc SON, Hyung Yun Kong, Sang Quang Nguyen

Published Oct 1, 2014• 1 citation
Publisher

Abstract

In this paper, the line-of sight and non line-of sight characteristics of a received signal are exploited to analyze the secrecy performance of the decode-and-forward scheme over Dual-Hop Asymmetric Fading Channels. In this scheme, the first hop from a source to relays is subject to Rician fading, whereas the second hop from relays to a destination experience Nakagami-m fading. The best relay is chosen to help the source to transmit data signals to the destination based on achievable secrecy rate (ASR) following criterions as: best source-relay, best relay-destination and best end-to-end. The secrecy performance is exactly evaluated by the secrecy outage probability of the ASR. The Monte-Carlo results are presented to verify the theoretical analysis.

DOI
10.1109/atc.2014.7043368

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In this paper, the line-of sight and non line-of sight characteristics of a received signal are exploited to analyze the secrecy performance of the decode-and-forward scheme over Dual-Hop Asymmetric Fading Channels. In this scheme, the first hop from a source to relays is subject to Rician fading, whereas the second hop from relays to a destination experience Nakagami-m fading. The best relay is chosen to help the source to transmit data signals to the destination based on achievable secrecy rate (ASR) following criterions as: best source-relay, best relay-destination and best end-to-end. The secrecy performance is exactly evaluated by the secrecy outage probability of the ASR. The Monte-Carlo results are presented to verify the theoretical analysis.
Wireless secrecy under dual correlated Rician fading environments is theoretically studied for correlated source-destination and source-wiretapper channels. Without considering wiretapper active jamming capability, expressions for: 1) the ergodic secrecy capacity when the wiretapper is active and 2) secrecy outage probability when the wiretapper is passive are obtained. To further improve system security, new secrecy analyses employing an adaptive encoder with ON/OFF transmission are also given. The new findings exactly reduce to existing findings under dual correlated Rayleigh fading and advance theoretical developments for wireless secrecy under dual correlated Rician fading. Monte Carlo simulation results are given, which match theoretical predictions. Under wireless secrecy context, the disadvantage of line-of-sight (LoS) power and channel correlation is evidently shown, revealing the non-usefulness of LoS power and establishing a tradeoff between the transmission security and the transmission success. Benefits of a high-average transmit signal-to-noise ratio are discussed.
In this paper, we consider secure communication to analyze the physical layer security over a wireless dual-hop relay system in the presence of an eavesdropper with imperfect channel state information (CSI). In this scheme, the first hop from a source to a relay and the second hop from the relay to a destination is subject to Rayleigh fading. The relay will help to forward data signals from the source to the destination based on achievable secrecy rates. The secrecy performance is exactly evaluated by the secrecy outage probability of the achievable secrecy rates. Numerical examples are provided to corroborate the proposed studies.
In this paper, we evaluate probability of non-zero secrecy capacity of multi-hop relay networks over Nakagamim fading channels in presence of hardware impairments.In the considered protocol, a source attempts to transmit its data to a destination by using multi-hop randomize-and-forward (RF) strategy.The data transmitted by the source and relays are overheard by an eavesdropper.For performance evaluation, we derive exact expressions of probability of non-zero secrecy capacity (PoNSC), which are expressed by sums of infinite series of exponential functions and exponential integral functions.We then perform Monte Carlo simulations to verify the theoretical analysis.
We examine the physical-layer security performance of a conventional dual-hop dual-relay (DH-DR) network, where two decode-and-forward relays are used to facilitate the communication from the source to the destination without a direct link between the source and the destination. The conventional DH-DR system employs an ordinary modulation scheme such as a 4-QAM modulation. Thus, we propose a signal-space technique to incorporate into the conventional DH-DR system that significantly improves the security performance of the conventional system. Note that both DF relays do not duplicate the data and instead forward different symbols to the destination because of the signal space technique. We analyze the proposed system for the secrecy outage probability and the intercept probability. The results confirm the 4 dB improvement in secrecy outage probability. Moreover, we assess the secrecy performance of the proposed system and compare it with the conventional system to show the superiority of the proposed system over the conventional one. Furthermore, we use Monte Carlo simulations to evaluate the proposed system's performance.
Impact of Relay’s Eavesdropping on Untrusted Amplify-and-Forward Networks Over Nakagami- mmm Fading
We investigate the impact of eavesdropping on the secrecy outage performance of dual-hop amplify-and-forward networks with a single untrusted relay, in which cooperative jamming technique is employed at the destination to realize positive secrecy rate. Under Nakagami-m fading channels, we derive tight closed-form and asymptotic expressions for the lower and upper bounds of the secrecy outage probability (SOP). Our results explicitly show that a secrecy diversity order of min(m1, m2/2) in terms of the SOP is achieved, where m1and m2are the respective integer fading parameters of the source-relay and relay-destination links. Afterwards, we propose an asymptotically optimal power allocation (OPA) scheme that minimizes the SOP. Numerical and simulation results show that the proposed OPA offers significant improvement on the SOP performance, especially in the case of m1> m2/2.
Today, wireless networks become the most popular way to communicate. However, information can be easily eavesdropped or extracted by eavesdroppers due to the broadcast nature of wireless communication. Multi-hop relay communication systems provide for higher secrecy performance than direct transmission techniques. In this paper, the physical layer secrecy performance of multi-hop decode-and-forward (DF) relay network is investigated in the presence of multiple passive eavesdroppers over Nakagami-m fading channels. To do so, we find out the exact closed-form expressions of existence probability of secrecy capacity and secrecy outage probability by using statistical characteristics of signal-to-noise ratio (SNR). Importantly, these expressions are in more general forms compared to other results in the literature. The proposed results show a quite agreement between numerical analysis and equivalent Monte-Carlo simulations.