OFDMA-Based DF Secure Cooperative Communication With Untrusted Users

Saini, Ravikant; Mishra, Deepak; De, Swades

doi:10.1109/lcomm.2016.2521655

Cited by 18 publications

(33 citation statements)

References 9 publications

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“…In physical layer security, the system models are generally classified in two broad categories -one having external eavesdropper which is an entity external to the network [6,7,8,9,10,11,12], and the other having untrusted users which are actually legitimate users of the system, who have lost mutual trust and consider each other as an eavesdropper [13,14,15]. Untrusted users is a far more hostile condition in comparison to external eavesdropper, where each user contends for a subcarrier against rest of the users (behaving as 2 eavesdroppers), which results in a relatively complex resource allocation problem and lesser secure rate [16].…”

Section: Resource Allocation Without Subcarrier Pairingmentioning

confidence: 99%

“…To communication with users, S has to communicate through R. All subcarriers over source to relay S − R link, and relay to users R − U link are considered to face quasi-static Rayleigh fading. Since all users are legitimate in the system, perfect CSI of all the links is available at source using conventional channel estimation and feedback mechanisms [7,8,15,13,14].…”

Section: System Model and Problem Formulationmentioning

confidence: 99%

“…The strongest eavesdropper with maximum SNR is hereafter referred to as equivalent eavesdropper U e . Secure rate R m sn of user U m over subcarrier n is given as [15,13,14]:…”

Section: Joint Resource Allocation Problemmentioning

confidence: 99%

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Subcarrier pairing as channel gain tailoring: Joint resource allocation for relay-assisted secure OFDMA with untrusted users

Saini

Mishra

2019

Physical Communication

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Joint resource allocation involving optimization of subcarrier allocation, subcarrier pairing (SCP), and power allocation in a cooperative secure orthogonal frequency division multiple access (OFDMA) communication system with untrusted users is considered. Both amplify and forward (AF), and decode and forward (DF) modes of operations are considered with individual power budget constraints for source and relay. After finding optimal subcarrier allocation for an AF relayed system, we prove the joint power allocation as a generalized convex problem, and solve it optimally. Compared to the conventional channel gain matching view, the optimal SCP is emphasized as a novel concept of channel gain tailoring. We prove that the optimal SCP pairs subcarriers such that the variance among the effective channel gains is minimized. For a DF relayed system, we show that depending on the power budgets of source and relay, SCP can either be in a subordinate role where it improves the energy efficiency, or in a main role where it improves the spectral efficiency of the system. In an AF relayed system we confirm that SCP plays a crucial role, and improves the spectral efficiency of the system. The channel gain tailoring property of SCP, various roles of SCP in improving the spectral and energy efficiency of a cooperative communication system are validated with the help of simulation results. ✩ A preliminary version of this work was presented at the IEEE GLOBECOM Wkshp, Trusted Commun., Physical layer security, Dec. 2017, Singapore [1].Mobile communication providing freedom from a tethered connection has led to an era of personalized world where users use network infrastructure at their will and comfort. With increasing usage of mobile applications for online transactions, the need of having strong security system to protect important information is increasing. In comparison to cryptographic techniques, physical layer security appears as a less-complex cost-effective solution [2]. For providing secure communication to all users, physical layer security has recently gathered much interest in cooperative communication [3].The concept of information theoretic security was introduced in a landmark paper by Wyner [4], where the author proved the feasibility of sending a message reliably to a destination, keeping it secret from an eavesdropper. Physical layer security utilizes the inherent independence of subcarriers in an orthogonal frequency division multiple access (OFDMA) system. It has been investigated recently for OFDMA-based broadcast and cooperative communication for next generation communication systems, such as, fourth-generation (4G) LTE and fifth-generation (5G) systems. An exhaustive survey on recent cooperative relaying and jamming strategies for physical layer security has been provided in [5]. Below, we survey the related works on secure OFDMA systems. Prior Art Resource Allocation without Subcarrier PairingIn physical layer security, the system models are generally classified in two broad categories -one having external e...

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Section: Resource Allocation Without Subcarrier Pairingmentioning

confidence: 99%

Section: System Model and Problem Formulationmentioning

confidence: 99%

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Subcarrier pairing as channel gain tailoring: Joint resource allocation for relay-assisted secure OFDMA with untrusted users

Saini

Mishra

2019

Physical Communication

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“…Under the umbrella of orthogonal frequency division multiple access, resource allocation for PLS in a dual hop with DF protocol has been studied in other works. () The power allocation problem to maximize the secrecy rate was investigated in the work of Jeong and Kim . The extension to this work with joint subcarrier allocation and power loading was made in the work of Wang et al Recently, Saini et al proposed the 2 different power optimization schemes at source and relay under individual power constraint: one achieves sum secrecy rate maximization in the presence of untrusted users, whereas the other achieves fairness for the minimum requirement of secrecy per user.…”

Section: Introductionmentioning

confidence: 99%

Enhancing physical layer security in AF relay–assisted multicarrier wireless transmission

Aman

Sidhu

Furqan

et al. 2018

Trans Emerging Tel Tech

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In this paper, we study the physical layer security problem in the dual‐hop orthogonal frequency division multiplexing–based wireless communication system. First, we consider a single‐user single‐relay system and study a joint power optimization problem at the source and relay subject to individual power constraint at the 2 nodes. The aim is to maximize the end‐to‐end secrecy rate with optimal power allocation over different subcarriers. Later, we consider a more general multiuser multirelay scenario. Under high signal‐to‐noise ratio approximation for end‐to‐end secrecy rate, an optimization problem is formulated to jointly optimize power allocation at the base station, the relay selection, subcarrier assignment to users, and the power loading at each of the relaying node. The target is to maximize the overall security of the system subject to independent power budget limits at each transmitting node and the orthogonal frequency division multiple access–based exclusive subcarrier allocation constraints. A joint optimization solution is obtained through the duality theory. Dual decomposition allows to exploit convex optimization techniques to find the power loading at the source and relay nodes. Furthermore, an optimization for power loading at relaying nodes along with relay selection and subcarrier assignment for the fixed power allocation at the base station is also studied. A suboptimal scheme that explores joint power allocation at all transmitting nodes for the fixed subcarrier allocation and relay assignment is investigated. Finally, simulation results are presented to validate the performance of the proposed schemes.

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“…With multi-antenna nodes, [8] investigated multiuser resource allocation for decode and forward (DF) relay assisted system without direct link, in the presence of single eavesdropper. The authors in [9] considered resource allocation problem for a DF relay assisted orthogonal frequency division multiple access (OFDMA) system with multiple untrusted users. Manuscript Assuming the availability of direct link, the optimal power allocation and transmission mode selection for DF relayassisted secure communication was considered in [10].…”

Section: Introductionmentioning

confidence: 99%

Utility Regions for DF Relay in OFDMA-Based Secure Communication With Untrusted Users

Saini

Mishra

2017

IEEE Commun. Lett.

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This paper investigates the utility of a trusted decode-and-forward relay in OFDMA-based secure communication system with untrusted users. For deciding whether to use the relay or not, we first present optimal subcarrier allocation policies for direct communication (DC) and relayed communication (RC). Next we identify exclusive RC mode, exclusive DC mode, and mixed (RDC) mode subcarriers which can support both the modes. For RDC mode we present optimal mode selection policy and a suboptimal strategy independent of power allocation which is asymptotically optimal at both low and high SNRs. Finally, via numerical results we present insights on relay utility regions.

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OFDMA-Based DF Secure Cooperative Communication With Untrusted Users

Cited by 18 publications

References 9 publications

Subcarrier pairing as channel gain tailoring: Joint resource allocation for relay-assisted secure OFDMA with untrusted users

Subcarrier pairing as channel gain tailoring: Joint resource allocation for relay-assisted secure OFDMA with untrusted users

Enhancing physical layer security in AF relay–assisted multicarrier wireless transmission

Utility Regions for DF Relay in OFDMA-Based Secure Communication With Untrusted Users

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