Exploiting Opportunistic Scheduling for Physical‐Layer Security in Multitwo User NOMA Networks

Shim, Kyusung; An, Beongku

doi:10.1155/2018/2797824

Cited by 7 publications

(9 citation statements)

References 38 publications

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“…However, 1 gets out of order beyond 30 dB. This is because of the order of user decoding process as described in (29), (30), (31), and (32). These observations are consistent with the derived analytical and asymptotic expressions.…”

Section: Figure 19supporting

confidence: 85%

“…(3.351.3) the final CDF expression can be obtained as in (33). Likewise, following the same procedures as in (A1), the CDF expressions of (4), (5), (6), (9), (10), (11), (12), (15), (16), (17), (18), (19), (20), (21), (22), (25), (26), (27), (28), (29), (30), (31), and (32) can be calculated. However, because of space limitation, the derivation details of these CDF expressions are omitted.…”

Section: Appendix A: Proof Of Propositionmentioning

confidence: 99%

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Leakage rate analysis with imperfect channel state information for cooperative nonorthogonal multiple access networks

Özduran

2020

Int J Communication

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This paper investigates the imperfect channel state information that is caused by the channel estimation error and feedback delay effects on the leakage rate analysis for the cooperative nonorthogonal multiple access networks. The investigation considers a dual hop one-/two-way nonorthogonal multiple access-based information exchange process with the aid of half-/full-duplex untrustworthy wireless relaying network for the leakage rate analysis. The channel estimation error causes system coding gain losses while the feedback delay does not have any effect on the users' outage performance at untrustworthy relay terminal in low signal-to-noise ratio regimes. Conversely, the channel estimation error effects become negligible while the feedback delay causes system coding gain losses on the users' outage performance at untrustworthy relay terminal in high signal-to-noise ratio. Results also reveal that the untrustworthy relay terminal, which is under the effect of the channel estimation error and feedback delay, is being active between −10 and 25-30 dB. Beyond 25-30 dB, the untrustworthy relay terminal becomes out of order and saturates. The Monte Carlo-based simulation results are in agreement with the analytical and asymptotic derivations. KEYWORDScooperative communications, leakage rate analysis, nonorthogonal multiple access INTRODUCTIONWireless information exchange process has become vulnerable to cyber attacks. This is because of the open medium of wireless communication and broadcasting nature. This results in an information leakage on the legitimate terminals' information exchange process. The literature contains several types of techniques to mitigate the information leakage. Until Wyner's wiretap channels, 1 the secure information exchange processes were compensated with the help of the higher layer encryption techniques, which are data encryption standard (DES), 2 triple data ecryption standard (TDES), 3 Rivest-Shamir-Adleman (RSA), 4 and advanced encryption standard (AES). 5 The drawback of the aforementioned higher level encryption techniques is the receiver needs to have a secret key to decode the cipher text. Wyner showed that the physical layer (PHY) security could be an alternative solution to mitigate the information leakage. Friendly jammers and/or legitimate terminals send artificial noise/interference to confuse the illegitimate terminals. There are several other Abbreviations: LRA, leakage rate analysis; NOMA, nonorthogonal multiple access; CC, cooperative communications Int J Commun Syst. 2020;33:e4387.wileyonlinelibrary.com/journal/dac

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Section: Figure 19supporting

confidence: 85%

Section: Appendix A: Proof Of Propositionmentioning

confidence: 99%

Leakage rate analysis with imperfect channel state information for cooperative nonorthogonal multiple access networks

Özduran

2020

Int J Communication

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“…According to NOMA [7], [9], the cell-edge user does not require the SIC process since the power allocation coefficient of the cell-edge user is larger than that of the cell-center user. Thus, the cell-center user's message is regarded as the interference at the cell-edge user [9], [25], [37]. The received SINR at the cell-edge user to decode x F k can be expressed as…”

Section: ) At the Cell-center Usermentioning

confidence: 99%

Exploiting Opportunistic Scheduling Schemes to Improve Physical-Layer Security in MU-MISO NOMA Systems

Shim

Nguyen

2019

IEEE Access

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This paper studies opportunistic scheduling schemes to enhance the secrecy performance in multi-user multiple-input single-output (MU-MISO) non-orthogonal multiple access (NOMA) systems, in which a multiple antenna base station (BS) serves multiple single-antenna cell-center and cell-edge users in the presence of multiple single-antenna eavesdroppers. In order to improve the secrecy performance, we propose an opportunistic scheduling scheme, called the proposed antenna/users selection (PAUS) scheme. Additionally, we consider two practical eavesdropping scenarios, namely colluding and non-colluding eavesdroppers. We derive the exact closed-form expression for secrecy outage probability (SOP) and asymptotic SOP of the PAUS scheme under different eavesdropping scenarios. We provide the 2D golden section search-based algorithm to find the optimal values of the transmit power and power allocation coefficient that minimize the system secrecy outage performance. The developed analyses are verified by Monte Carlo simulations. The numerical results show that the PAUS scheme improves secrecy performances compared to the benchmark random antenna/users selection (RAUS) scheme. To provide further insights into the system secure performance, the effects of transmit signal-to-noise ratio (SNR), power allocation coefficient, the number of transmit antennas at the BS, number of cell-center and cell-edge users, and the eavesdropper placements are extensively evaluated and discussed.INDEX TERMS Multi-user multiple-input single-output, non-orthogonal multiple access, opportunistic scheduling, physical layer security, secrecy outage probability.

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“…In this scheme, the main and eavesdropper channels are jointly considered, thus, ONS scheme can achieve the most robust performance [33,39]. Since the ONS scheme utilizes both the main and eavesdropper channel to enhance secrecy performance, the selection criteria can be mathematically described as…”

Section: Optimal Node Selection Schemementioning

confidence: 99%

Exploiting Opportunistic Scheduling Schemes and WPT-Based Multi-Hop Transmissions to Improve Physical Layer Security in Wireless Sensor Networks

Shim

Nguyen

2019

Sensors

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This paper studies the secrecy performance of wireless power transfer (WPT)-based multi-hop transmissions in wireless sensors networks (WSNs), where legitimate nodes harvest energy from multiple power beacons (PBs) to support the multi-hop secure data transmission to a destination in the presence of an eavesdropper. Specifically, the PBs not only transfer radio frequency energy to the legitimate nodes but also act as friendly jammers to protect data transmission. To improve secrecy performance, we propose two secure scheduling schemes, named minimum node selection (MNS) scheme and optimal node selection (ONS) scheme. We then evaluate the performance of the proposed schemes in terms of the exact closed-form for secrecy outage probability (SOP) and asymptotic SOP. The developed analyses are verified by Monte-Carlo simulations. The numerical results show that the ONS scheme outperforms the MNS scheme emerging as an effective protocol for secure multi-hop transmission in WSNs. Furthermore, the effects of the number of PBs, number of hops, time switching ratio, and the secure target data rate on the system performance are also investigated.

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Exploiting Opportunistic Scheduling for Physical‐Layer Security in Multitwo User NOMA Networks

Cited by 7 publications

References 38 publications

Leakage rate analysis with imperfect channel state information for cooperative nonorthogonal multiple access networks

Leakage rate analysis with imperfect channel state information for cooperative nonorthogonal multiple access networks

Exploiting Opportunistic Scheduling Schemes to Improve Physical-Layer Security in MU-MISO NOMA Systems

Exploiting Opportunistic Scheduling Schemes and WPT-Based Multi-Hop Transmissions to Improve Physical Layer Security in Wireless Sensor Networks

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