Quasi-concave optimization of secrecy redundancy rate in HARQ-CC system

Wu, Yue; Yin, Shishu; Zhou, Jian; Yang, Pei; Yang, Hongwen

doi:10.1007/s11432-019-2660-3

Cited by 3 publications

(3 citation statements)

References 26 publications

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“…Most related works have not considered the influence of SOP in secrecy throughput, but this has been found to be inaccurate [24]. Hence, we define the effective secrecy throughput (EST) of a secure HARQ-CC system as [26]…”

Section: Security Performance Metricsmentioning

confidence: 99%

“…However, most of them did not consider the influence of secrecy outage on secrecy throughput, which generally led to overestimated performance [24]. Hence, in our previous work, we extended the effective secrecy throughput (EST) of a single transmission [25] into a HARQ-CC system with a passive eavesdropper, and optimized secrecy redundancy rate for improved security [26]. Nevertheless, another common scenario, which includes multiple eavesdroppers, rate adaption and limited latency, has not yet been analyzed.…”

Section: Introductionmentioning

confidence: 99%

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Rate Adaption for Secure HARQ-CC System with Multiple Eavesdroppers

Yin

Zhou

et al. 2020

Entropy

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In this paper, we studied the secure transmission of a hybrid automatic repeat request with chase combining (HARQ-CC) system, under the existence of multiple eavesdroppers and limited latency. First, we analyzed some critical performance metrics, including connection outage probability (COP), secrecy outage probability (SOP) and effective secrecy throughput (EST). Then, to maximize the EST, three optimization problems of rate adaption were discussed: (i) optimizing the code rate with a given secrecy redundancy rate by a parameterized closed-form solution; (ii) optimizing the secrecy redundancy rate with a given code rate by a fixed-point method; (iii) optimizing both code rate and secrecy redundancy rate by an iterative optimization algorithm. We also considered COP and SOP constraints among the problems while corresponding solutions were deduced. Finally, numerical and simulated results verified our conclusions that the approximated SOP matches well with Monte–Carlo simulation for a strict reliable constraint, and that the optimized transmitting rate enhances EST efficiently with multiple eavesdroppers and retransmissions. Moreover, the influence of the number of eavesdroppers on secrecy performance was analyzed. Briefly, secrecy performance inevitably deteriorates with increasing number of eavesdroppers due to raised information leakage.

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Section: Security Performance Metricsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Rate Adaption for Secure HARQ-CC System with Multiple Eavesdroppers

Yin

Zhou

et al. 2020

Entropy

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“…Mheich et al designed a rate adaptive secure HARQ scheme [ 29 ], and Guan et al addressed the reliability–security trade-off and accurate secrecy throughput [ 30 ]. It has been demonstrated that an eavesdropper cannot obtain the same diversity gain as a legitimate user, since re-transmissions rely solely on the latter user [ 31 ]. As another import metric, effective secrecy throughput (EST) with multiple eavesdroppers has been optimized in secure HARQ transmissions [ 32 ].…”

Section: Introductionmentioning

confidence: 99%

On the Secure Performance of Intelligent Reflecting Surface-Assisted HARQ Systems

Duan

et al. 2023

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This paper analyzes the physical layer security performance of hybrid automatic repeat request (HARQ) systems with the assistance of an intelligent reflecting surface (IRS) and aims to reveal the primary factors that enhance PLS. First, closed-form expressions for the connection outage probability (COP) and secrecy outage probability (SOP) in HARQ with chase combining (HARQ-CC) are acquired using the generalized-K (KG) distribution. Then, these two critical metrics are derived while adopting HARQ with incremental redundancy (HARQ-IR), resorting to the mixture gamma (MG) distribution and the Mellin transform. Diversity and coding gain are also addressed through an asymptotic analysis of the COP and SOP. Finally, an evaluation of the numerical results demonstrates that a greater gain in the main channel and the wiretap channel can be produced by increasing the number of meta-surfaces rather than increasing the maximum transmission number, except for the higher signal-to-noise (SNR) region of HARQ-IR where the latter is preferred. This finding provides a significant guidance for the joint configuration of IRS and HARQ to achieve secure communication.

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