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Journal of computer and electronics studies

Performance Analysis of Decode-and-Forward System

Wei Zhang

Published Jan 1, 2019• 0 citations
Publisher

Abstract

For cooperative system, in which eavesdropper can be anywhere, so it may overhear information through both source and relay’ transmission . In this letter, we evaluate the secrecy performance of decode-and- forward (DF) system with both the optimal relay selection (ORS) and the conventional relay selection (CRS) schemes, and the closed expression on the secrecy outage probability(SOP) of two schemes are derived; The derivations are confirmed through Monte Carlo simulations.

DOI
10.35532/jces.v1.024

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For cooperative system, in which eavesdropper can be anywhere, so it may overhear information through both source and relay’ transmission . In this letter, we evaluate the secrecy performance of decode-and- forward (DF) system with both the optimal relay selection (ORS) and the conventional relay selection (CRS) schemes, and the closed expression on the secrecy outage probability(SOP) of two schemes are derived; The derivations are confirmed through Monte Carlo simulations.
In this work, we investigate the security performance of adaptive decode-and-forward cooperative networks when the signals transmitted from source and relay would be wiretapped. Based on whether the channel state information (CSI) of the wiretap link is available or not, optimal relay selection (ORS), conventional relay selection (CRS), and multiple relays selection (MRS) schemes are considered, and the exact closed-form expressions for security outage probability (SOP) are derived. Besides, we obtain the closed-form expressions for the secrecy diversity order and secrecy array gain of the three different selection schemes through asymptotic analysis. Simulations are presented to validate the accuracy of our proposed analytical results and illustrate that ORS is the best scheme. Furthermore, asymptotic analysis reveals that the secrecy diversity order of each scheme is the same and closely related to the number of relays. The impact of the wiretap channels is only reflected in the secrecy array gain. Finally, we determine the optimal power allocation between the source and relay.
The traditional relay selection scheme only considers the channel state information (CSI) of legitimate users, and does not consider the power allocation between the source node and relay node. However, in the actual transmission system, there will be potential eavesdropper, and the traditional relay selection scheme will greatly reduce the security of the system. In this letter, we evaluate the secrecy outage probability (SOP) of relay selection scheme with a decode-and-forward (DF) protocol over independent and non-identically distributed Rayleigh fading. With the CSI of eavesdropper and the power allocation of source node and relay nodes are considered, the secrecy performance of cooperative communication system can be improved effectively.
For cooperative systems, in which an eavesdropper overhears source information through relays' transmission, an optimal relay selection (ORS) scheme has recently been proposed to improve the system secrecy performance. In this letter, we evaluate the secrecy outage probability (SOP) of the ORS scheme with an amplify-and-forward system over independent and non-identically distributed Rayleigh fading. More specifically, we derive a tight approximation on the SOP. Thereafter, by analyzing asymptotic behaviour of the derived approximation, novel insights are revealed. The derivations are confirmed through Monte Carlo simulations.
Secrecy Analysis in DF Relay Over Generalized-KKK Fading Channels
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. Furthermore, 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. Moreover, 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.
In this paper, a source communicates to the destination with the cooperation of a relay, in the presence of an eavesdropper. All the links undergo Rayleigh fading and perfect decoding at the relays is not considered. The secrecy outage probability expression is evaluated for a decode-and-forward (DF) dual-hop cooperative relay network, both with and without the presence of direct source to eavesdropper transmission link. The performance of the maximal ratio combining (MRC) and selection combining (SC) diversity at the eavesdropper is investigated. Asymptotic and diversity gain analysis for both the single relay and multi-relay system is obtained, when average SNRs of source-relay and relay-destination links are balanced or unbalanced. We have shown that the increase in target secrecy rate and eavesdropper channel quality significantly affects the outage performance of the system. We have investigated the outage probability of optimal relay selection scheme, when either full instantaneous channel state information (ICSI) or statistical channel state information (SCSI) of all the links is available and have shown that there is improvement in the secrecy performance with the increase in the number of relays.
In this paper, we derive and compare the performance of relay selection strategies presence of an active adversary under a cooperative setting. The system consists of a source, a destination, multiple decode-and-forward relays and an active eavesdropper. These DF relays correctly decode source message, if their signal-to-noise ratio is above a certain threshold. The channels experience independent but not identical Rayleigh fading. We assume both source and eavesdropper can exploit direct and relaying channel. Two relay selection schemes are performed by the eavesdropper, which is assumed to be a part of the system and active. A conventional all-performing relays (using maximal ratio combining) scheme is compared with the above mentioned schemes. We obtain closed-form expressions for the secrecy outage probability of these three strategies. An asymptotic analysis is presented only when relay selection is performed by the eavesdropper. From numerical results, it is observed that relay selection performed by the active eavesdropper proves to be the worst from the perspective of legitimate receiver. Also restriction on either of the two hops results in flooring of secrecy performance.