Energy efficient resource allocation for secure OFDMA relay systems with eavesdropper

Chang, Zheng; Hou, Xin; Guo, Xijuan; Ristaniemi, Tapani

doi:10.1109/icc.2016.7510805

Cited by 10 publications

(6 citation statements)

References 15 publications

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“…According to (35)- (36), relay R is selected in two-way relaying network if it can provide the maximum marginal benefit to the system. In other words, if relay R provides the maximum system sum-throughput in slot n, relay R has the highest priority to be selected for information transmission among all candidate relay nodes [46], [50], [51].…”

Section: ∂Lmentioning

confidence: 99%

Throughput Maximization for Two-Way Buffer-Aided and Energy-Harvesting Enabled Multi-Relay Networks

Zeng

Xiao

et al. 2019

IEEE Access

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For years, relay communications have been witnessed to extend the network coverage and improve the throughput and reliability of wireless systems. In this paper, we focus on throughput maximization for the two-way buffer-aided relay network with finite data buffers and limited energy battery, wherein relays have no fixed power supply and they replenish energy from the Radio Frequency (RF) signal radiated by source nodes. Specifically, by jointing the time switching and energy splitting for RF energy harvesting, we introduce a three time-subslot transmission model to balance the energy storage and the energy consumption for communication. On top of this transmission model, we formulate an optimization problem for throughput maximization of relay network. We purposely convert the non-convex optimization problem into a convex one by carefully decoupling and relaxing. Further, we theoretically derive the maximum throughput and apply an iterative algorithm to achieve the suboptimal solution based on relay selection and power allocation. In addition to solving the no-delay limited throughput maximization problem, we put forward the solution of the delay limited transmission in the two-way buffer-aided multi-relay networks. Extensive simulations have been conducted to demonstrate that our proposed strategy is able to significantly improve the sum-throughput under transmission energy and delay constraints. INDEX TERMS Two-way relay networks, buffer-aided, energy harvesting, dual optimization.

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Section: ∂Lmentioning

confidence: 99%

Throughput Maximization for Two-Way Buffer-Aided and Energy-Harvesting Enabled Multi-Relay Networks

Zeng

Xiao

et al. 2019

IEEE Access

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“…From (28) Remark 8. Note that the observation in Theorem 2 is valid for any power allocation strategy that assigns more power over a subcarrier with more channel gain.…”

Section: Optimal Scp For Af Relay Systemmentioning

confidence: 98%

“…We also believe that, joint resource allocation involving subcarrier allocation, power allocation, and subcarrier pairing has not been investigated for untrusted users. Lastly, it is also worth noting that the prior works considering SCP in secure OFDMA have solved the problem in dual domain [27,28,29]. Their dual decomposition based iterative solutions suffer from duality gap error which vanishes only with very large number of subcarriers.…”

Section: Research Gap and Motivationmentioning

confidence: 99%

“…Joint resource allocation for two-way AF relay-assisted multiuser networks was investigated in [26].Secure OFDMA: Joint resource allocation problem involving subcarrier allocation, source power allocation and subcarrier pairing was studied in [27] for an AF relayed secure communication system considering equal power allocation at relay. Energy-efficient resource allocation problem in a multi-user multi-relay scenario with an external eavesdropper was studied in [28]. Joint resource allocation for secure OFDMA two-way relaying with an external eavesdropper and multiple source-destination pairs was discussed in [29].…”

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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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“…Aiming to maximize the secrecy rate joint power and subcarrier allocation and subcarrier pairing optimization is presented and solved using the dual method. A multi‐user OFDMA single‐relay network with multiple BS‐user‐pairs is investigated in Reference 38, in the presence of a multi‐antenna passive eavesdropper. Here, the BS is able to obtain the perfect CSI of the relay and user channels while the CSI of the passive eavesdropper is unknown.…”

Section: Introductionmentioning

confidence: 99%

Achievable secrecy rate analysis of OFDM‐based multi‐user untrusted relay networks with imperfect CSI

Özduran,

Nomikos,

Ansari

2024

Trans Emerging Tel Tech

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This study investigates the impact of imperfect channel state information (CSI), caused by channel estimation errors and feedback delays, on the physical‐layer security performance of multi‐user relay networks. More specifically, a multi‐user untrusted half/full‐duplex (HD/FD) uni/bi‐directional wireless amplify‐and‐forward (AF) relay network is studied, adopting orthogonal frequency division multiplexing (OFDM). In order to minimize the information leakage, it is considered that a limited number of friendly jammers affect the untrusted relay. In this context, the achievable secrecy rate of the relay network is theoretically analyzed and optimization problems are formulated and solved for the untrusted relay's location and power allocation. Monte Carlo simulations are conducted to validate the theoretical findings, revealing that channel estimation errors cause coding gain losses for low signal‐to noise ratio (SNR) while their impact becomes negligible for high SNR. Also, a large number of user‐pairs achieves higher secrecy rate while FD relaying further improves the secrecy performance. Finally, bi‐directional relaying provides higher achievable secrecy rate over uni‐directional relaying.

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Energy efficient resource allocation for secure OFDMA relay systems with eavesdropper

Cited by 10 publications

References 15 publications

Throughput Maximization for Two-Way Buffer-Aided and Energy-Harvesting Enabled Multi-Relay Networks

Throughput Maximization for Two-Way Buffer-Aided and Energy-Harvesting Enabled Multi-Relay Networks

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

Achievable secrecy rate analysis of OFDM‐based multi‐user untrusted relay networks with imperfect CSI

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