Static hybrid amplify and forward (AF) and decode and forward (DF) relaying for cooperative systems

Boujemâa, Hatem

doi:10.1016/j.phycom.2011.05.001

Cited by 17 publications

(6 citation statements)

References 23 publications

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“…Now substituting Equation ( 13) and PDF of Rayleigh distribution from Equation (7) into Equation (2) the expression for lower bound of HD-NOMA system when Eve's dropper is present on S-D1 link only can be expressed as given in Equation ( 14)…”

Section: 12mentioning

confidence: 99%

“…However, by employing NOMA techniques in cooperative communication, where the strong user identifies weaker users and acts as relay for it, it is found superior than NOMA alone [5]. Dedicated relaying with the Amplify and Forwards (AF) and Decode and Forwards (DF) protocols in half‐duplex and full‐duplex modes has also been employed in literature [6–14] as additional cooperative strategies, particularly when there is no direct connection between communication nodes. A half‐duplex system is the one in which a host can send or receive at one time while in a full‐duplex system, the host can send and receive simultaneously.…”

Section: Introductionmentioning

confidence: 99%

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Secrecy outage probability of DF‐based C‐NOMA under half and full duplex

Gadi,

Singh,

Kumar

et al. 2023

IET Communications

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Cooperative Non‐orthogonal Multiple Access (C‐NOMA) is projected as the dominant technology for 5G and beyond. Also, physical layer security, due to the presence of eaves‐dropper, is a bottleneck security concern for any open link wireless system. This manuscript presents a novel Decode & Forward (DF)‐based C‐NOMA system in the presence of two eavesdroppers. Moreover, both half duplex and full duplex schemes are included in the analysis. Thereby, separate expressions for Secrecy Outage Probability (SOP), being among the most crucial performance measures in physical layer security, are produced and examined for the system under consideration. Specifically, first of all, novel expression of SOP for C‐NOMA systems under both Half Duplex (HD) and Full Duplex (FD) schemes is derived for the case when only eavesdropper one (E1) attacks on link source to device one (S‐D1). Thereafter, expressions of SOP for the C‐NOMA system under both HD and FD schemes are derived, considering presence of E1 and E2 on the links, source to device one (S‐D1) and source to device two (S‐D2), respectively. Further, for both the duplexes, the effect of eavesdropper one (E1) and eavesdropper two (E2) on the links, S‐D1 and S‐D2, respectively, is analyzed. The presented analysis is useful in the technological development level of C‐NOMA in the presence of multiple eavesdroppers. The simulated results show perfect agreement with the theory.

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Section: 12mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Secrecy outage probability of DF‐based C‐NOMA under half and full duplex

Gadi,

Singh,

Kumar

et al. 2023

IET Communications

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“…Among the available cooperative schemes, dedicated relaying techniques have been proven to improve spatial and spectrum diversity, especially when no direct channel exists between communicating nodes or when a huge number of cell edge users have to be served . Different strategies such as Amplify and forward (AF) and decode and forward (DF) protocols are usually used especially for taking advantage from spatial diversity without requiring multiple antennas at the transmitter [8,9]. In [10][11][12][13], downlink cooperative NOMA relying system based AF and DF strategies revealed better spectral efficiency and outage probability than conventional cooperative relaying system.…”

Section: Introductionmentioning

confidence: 99%

Secrecy Performance Analysis of Half/Full Duplex AF/DF Relaying in NOMA Systems Over κ - μ Fading Channels

Zaghdoud¹,

Mnaouer

Boujemâa³

et al. 2021

Preprint

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Although the progress in understanding 5G and beyond techniques such as Non-Orthogonal Multiple Access (NOMA) and full-duplex techniques has been overwhelming, still analyzing the security aspects of such systems under different scenarios and settings is an important concern that needs further exploration. In particular, when considering fading in wiretap channels and scenarios, achieving secrecy has posed many challenges. In this context, we propose to study the physical layer security (PLS) of cooperative NOMA (C-NOMA) system using the general fading distribution κ - μ. This distribution facilitates mainly the effect of light-of-sight as well as multipath fading. It also includes multiple distributions as special cases like: Rayleigh, Rice, Nakagami-m which help to understand the comportment of C-NOMA systems under different fading parameters. The use of Half-Duplex and Full-Duplex communication is also investigated for both Amplify-and-forward (AF) and Decode-and-Forward (DF) relaying protocols. To characterize the secrecy performance of the proposed C-NOMA systems, closed form expressions of the Secrecy Outage Probability (SOP) and the Strictly Positive Secrcey Capacity (SPSC) metrics for the strong and weak users are given for high signal-to-noise ratio (SNR) due to the intractable nature of the exact expressions. Based on the analytical analysis, numerical and simulation results are given under different network parameters.

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“…Cooperative communication technology is one of the most important research focus in the field of wireless communication nowadays. When to design a wireless communication system, it needs to consider overcoming the characteristics of wireless channel fading, expanding channel capacity and improving the channel quality, while cooperative relay technology can overcome the above problems [1]. Cooperative relay technology can greatly improve the quality of communication, resist the influence of wireless channel fading, shadow effect and multi-path effect, expand the scope of communication, and reduce the mobile terminals, etc.Cooperative relay technology can greatly improve the quality of communication, resist the influence of wireless channel fading, shadow effect and multi-path effect, expand the scope of communication, and reduce the mobile terminals, etc.…”

Section: Introductionmentioning

confidence: 99%

“…In the first time slot, A and B simultaneously send their own signals to R. In this way, the received signals at R can be expressed as (1).…”

Section: Introductionmentioning

confidence: 99%

The AF protocol of cooperative communication system

Yuan¹,

Gong²,

Chen³

et al. 2016

Proceedings of the 2016 3rd International Conference on Materials Engineering, Manufacturing Technology and Control

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Wireless communication system using cooperative transmission technology, at the receiving node by combining data samples from multiple independent fading channel, can effectively resist the influence of channel fading, obtain diversity gain, and improve the transmission reliability of the system. The purpose of cooperative communication technology is to solve the problem of communication effectiveness. This article expounds the amplify-and-forward(AF) protocol of the cooperative relay technology that is one of the key technology in cooperative communication technology, and discusses its ergodic capacity(EC). Theory proves that two-way relay can greatly improve the rate of information transmission 2. The protocol of two-way relay system Considering a two-way relay communication system, the user nodes-A and B exchange information each other. But because there is no direct link between A and B, and needs to forward information through the relay node-R, as shown in Fig. 1[3]. Supposing the system goes through flat fading, and adopts time-division duplex mode, then the channels are reciprocity. Take the system as shown in Fig. 1 as an example to discuss the different protocols two-way relay system.

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Static hybrid amplify and forward (AF) and decode and forward (DF) relaying for cooperative systems

Cited by 17 publications

References 23 publications

Secrecy outage probability of DF‐based C‐NOMA under half and full duplex

Secrecy outage probability of DF‐based C‐NOMA under half and full duplex

Secrecy Performance Analysis of Half/Full Duplex AF/DF Relaying in NOMA Systems Over κ - μ Fading Channels

The AF protocol of cooperative communication system

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