Exploiting Uplink NOMA to Improve Sum Secrecy Throughput in IoT Networks

This paper exploits nonorthogonal multiple access (NOMA) to enhance the uplink secure transmission in Internet of Things (IoT) networks. Considering the different intercept ability of eavesdroppers (Eve), secrecy performances of both strong and weak Eve wiretap scenarios have been investigated. In strong Eve wiretap scenario (SWS), Eve is assumed to be powerful enough to decode message without interference and, in weak Eve wiretap scenario (WWS), Eve is assumed to have significant demodulation capability constraint. The new closed-form expressions of joint connection outage probability (JCOP), joint secrecy outage probability (JSOP), and sum secrecy throughput (SST) are derived in these two scenarios to indicate the impact of parameters, i.e., transmit power, codeword rate, and the placement of devices, on security performance. In order to demonstrate the superiority of NOMA, we also investigate the secrecy performance of orthogonal multiple access (OMA) system as a benchmark. Analysis results show that the performance in WWS is always better than that in SWS and, in low signal-to-noise ratio (SNR) or high codeword rate region, the performances of these two scenarios are close. In addition, we present the condition that NOMA outperforms OMA in terms of SST. Moreover, the placements of devices are significant to the SST performance of NOMA system. The suboptimal device placement scheme has been designed to maximize SST. Analysis results demonstrate that when Eve is far away from legal users, the suboptimal results tend to optimal.

Download Full-text

Exact secure outage probability performance of uplinkdownlink multiple access network under imperfect CSI

Bulletin of Electrical Engineering and Informatics ◽

10.11591/eei.v10i6.2981 ◽

2021 ◽

Vol 10 (6) ◽

pp. 3274-3281

Author(s):

Dinh-Thuan Do ◽

Minh-Sang Van Nguyen

Keyword(s):

Outage Probability ◽

Multiple Access ◽

Signal To Noise Ratio ◽

Access Network ◽

Base Station ◽

High Signal ◽

Secrecy Outage Probability ◽

Factors Affecting ◽

Secrecy Outage ◽

The Right

In this paper, we study uplink-downlink non-orthogonal multiple access (NOMA) systems by considering the secure performance at the physical layer. In the considered system model, the base station acts a relay to allow two users at the left side communicate with two users at the right side. By considering imperfect channel state information (CSI), the secure performance need be studied since an eavesdropper wants to overhear signals processed at the downlink. To provide secure performance metric, we derive exact expressions of secrecy outage probability (SOP) and and evaluating the impacts of main parameters on SOP metric. The important finding is that we can achieve the higher secrecy performance at high signal to noise ratio (SNR). Moreover, the numerical results demonstrate that the SOP tends to a constant at high SNR. Finally, our results show that the power allocation factors, target rates are main factors affecting to the secrecy performance of considered uplink-downlink NOMA systems.

Download Full-text

On Secrecy Outage Probability for Downlink NOMA Systems With Relay-Antenna Selection

10.21203/rs.3.rs-1119431/v1 ◽

2021 ◽

Author(s):

Shu Xu ◽

Chen Liu ◽

Hong Wang ◽

Mujun Qian ◽

Wenfeng Sun

Keyword(s):

Outage Probability ◽

Multiple Access ◽

Antenna Selection ◽

Maximal Ratio Combining ◽

Selection Combining ◽

Secrecy Outage Probability ◽

Channel State ◽

Secrecy Outage ◽

Secure Transmission ◽

Theoretical Results

Abstract Secure transmission is essential for future non-orthogonal multiple access (NOMA) system. This paper investigates relay-antenna selection (RAS) to enhance physical-layer security (PLS) of cooperative NOMA system in the presence of an eavesdropper, where multiple antennas are deployed at the relays, the users, and the eavesdropper. In order to reduce expense on radio frequency (RF) chains, selection combining (SC) is employed at both the relays and the users, whilst the eavesdropper employs either maximal-ratio combining (MRC) or selection combining (SC) to process the received signals. Under the condition that the channel state information (CSI) of the eavesdropping channel is available or unavailable, two e↵ective relay-antenna selection schemes are proposed. Additionally, the closed-form expressions of secrecy outage probability (SOP) are derived for the proposed relay-antenna selection schemes. In order to gain more deep insights on the derived results, the asymptotic performance of the derived SOP is analyzed. In simulations, it is demonstrated that the theoretical results match well with the simulation results and the SOP of the proposed schemes is less than that of the conventional orthogonal multiple access (OMA) scheme obviously.

Download Full-text

Impact of Antenna Selection on Physical-Layer Security of NOMA Networks

Wireless Communications and Mobile Computing ◽

10.1155/2018/2390834 ◽

2018 ◽

Vol 2018 ◽

pp. 1-11 ◽

Cited By ~ 4

Author(s):

Dan Deng ◽

Chao Li ◽

Lisheng Fan ◽

Xin Liu ◽

Fasheng Zhou

Keyword(s):

Secure Communication ◽

Antenna Selection ◽

Asymptotic Expression ◽

Signal To Noise Ratio ◽

Secrecy Outage Probability ◽

Decode And Forward ◽

Secure Information ◽

Secrecy Outage ◽

The Impact ◽

Secure Transmission

This paper studies the impacts of antenna selection algorithms in decode-and-forward (DF) cooperative nonorthogonal multiple access (NOMA) networks, where the secure information from the relay can be overheard by an eavesdropper in the networks. In order to ensure the secure transmission, an optimal antenna selection algorithm is proposed to choose one best relay’s antenna to assist the secure transmission. We study the impact of antenna selection on the system secure communication through deriving the analytical expression of the secrecy outage probability along with the asymptotic expression in the high regime of signal-to-noise ratio (SNR) and main-to-eavesdropper ratio (MER). From the analytical and asymptotic expressions, we find that the system secure performance is highly dependent on the system parameters such as the number of antennas at the relay, SNR, and MER. In particular, the secrecy diversity order of the system is equal to the antenna number, when the interference from the second user is limited.

Download Full-text

Performance Analysis of MEC Based on NOMA under Imperfect CSI with Eavesdropper

Wireless Communications and Mobile Computing ◽

10.1155/2021/2700843 ◽

2021 ◽

Vol 2021 ◽

pp. 1-10

Author(s):

Xuehua Li ◽

Yingjie Pei ◽

Huan Jiang ◽

Xinwei Yue ◽

Yafei Wang ◽

...

Keyword(s):

Energy Efficiency ◽

Channel State Information ◽

Multiple Access ◽

System Throughput ◽

Secrecy Outage Probability ◽

Imperfect Csi ◽

Channel State ◽

State Information ◽

Secrecy Outage ◽

The Impact

Mobile edge computing (MEC) is becoming more and more popular because of improving computing power in virtual reality, augmented reality, unmanned driving, and other fields. This paper investigates a nonorthogonal multiple access- (NOMA-) based MEC system, which is under imperfect channel state information (ipCSI). In this system model, a pair of users offloads their tasks to the MEC server with the existence of an eavesdropper (Eve). To evaluate the impact of Eve on the performance of the NOMA-MEC system, the secrecy outage probability (SOP) expressions for two users with the conditions of imperfect CSI and perfect channel state information (pCSI) are derived. In addition, both throughput and energy efficiency are discussed in the delay-limited transmission mode. Simulation results reveal that (1) due to the influence of channel estimation errors, the secrecy outage behaviors of two users under ipCSI conditions are worse than those of users with pCSI; (2) the secrecy performance of NOMA-MEC is superior to orthogonal multiple access- (OMA-) aided MEC systems; and (3) the NOMA-MEC systems have the ability to attain better system throughput and energy efficiency compared with OMA-MEC.

Download Full-text

A Study of Physical Layer Security in SWIPT-Based Decode-and-Forward Relay Networks with Dynamic Power Splitting

Sensors ◽

10.3390/s21175692 ◽

2021 ◽

Vol 21 (17) ◽

pp. 5692

Author(s):

Van-Duc Phan ◽

Tan N. Nguyen ◽

Anh Vu Le ◽

Miroslav Voznak

Keyword(s):

Outage Probability ◽

Physical Layer Security ◽

Physical Layer ◽

Secrecy Outage Probability ◽

Power Splitting ◽

Decode And Forward ◽

Dynamic Power ◽

Secrecy Outage ◽

Multiple Relay ◽

The Impact

In this paper, we study the physical layer security for simultaneous wireless information and power transfer (SWIPT)-based half-duplex (HD) decode-and-forward relaying system. We consider a system model including one transmitter that tries to transmit information to one receiver under the help of multiple relay users and in the presence of one eavesdropper that attempts to overhear the confidential information. More specifically, to investigate the secrecy performance, we derive closed-form expressions of outage probability (OP) and secrecy outage probability for dynamic power splitting-based relaying (DPSBR) and static power splitting-based relaying (SPSBR) schemes. Moreover, the lower bound of secrecy outage probability is obtained when the source’s transmit power goes to infinity. The Monte Carlo simulations are given to corroborate the correctness of our mathematical analysis. It is observed from simulation results that the proposed DPSBR scheme outperforms the SPSBR-based schemes in terms of OP and SOP under the impact of different parameters on system performance.

Download Full-text

On the Performance of Security-Based Nonorthogonal Multiple Access in Coordinated Multipoint Networks

Wireless Communications and Mobile Computing ◽

10.1155/2018/8921895 ◽

2018 ◽

Vol 2018 ◽

pp. 1-6 ◽

Cited By ~ 1

Author(s):

Yue Tian ◽

Xianling Wang ◽

Zhanwei Wang

Keyword(s):

Outage Probability ◽

Physical Layer Security ◽

Multiple Access ◽

Physical Layer ◽

Secrecy Outage Probability ◽

Coordinated Multipoint ◽

Security Issues ◽

Sum Rate ◽

Secrecy Outage

The conventional nonorthogonal multiple access (NOMA) strategy has secrecy challenge in coordinated multipoint (CoMP) networks. Under the secrecy considerations, this paper focuses on the security-based NOMA system, which aims to improve the physical layer security issues of conventional NOMA in the coordinated multipoint (NOMA-CoMP) networks. The secrecy performance of S-NOMA in CoMP, that is, the secrecy sum-rate and the secrecy outage probability, is analysed. In contrast to the conventional NOMA (C-NOMA), the results show that the proposed S-NOMA outperforms C-NOMA in terms of the secrecy outage probability and security-based effective sum-rate.

Download Full-text

Analysis of SWIPT-Enabled Relay Networks with Full-Duplex Destination-Aided Jamming

Security and Communication Networks ◽

10.1155/2021/6193012 ◽

2021 ◽

Vol 2021 ◽

pp. 1-18

Author(s):

Jinglan Ou ◽

Hangchuan Shi ◽

Liubin Wang ◽

Rui Ma ◽

Haowei Wu

Keyword(s):

Outage Probability ◽

Closed Form ◽

Signal To Noise Ratio ◽

Full Duplex ◽

Relay Network ◽

Closed Form Expression ◽

Artificial Noise ◽

Secrecy Outage Probability ◽

Power Splitting ◽

Secrecy Outage

Simultaneous wireless information and power transfer (SWIPT) is a major breakthrough in the field of low-power wireless information transmissions. In this paper, the secrecy performance of the SWIPT-enabled relay network with full-duplex destination-aided jamming is assessed, where both the power-splitting (PS) and time-switching (TS) schemes at the relay are considered with the linear and nonlinear energy harvesting models. The relay harvests energy from the confidential signal and artificial noise sent by the source and destination, respectively, and forwards the amplified signal to the destination, in the presence of an eavesdropper. The analytical closed-form expressions of the connection outage probability (COP), secrecy outage probability (SOP), and transmission outage probability (TOP) for PS- and TS-based schemes are derived, and the closed-form expression of the lower bound of ergodic secrecy capacity (ESC) is calculated. The asymptotic-form expressions of the COP, SOP, TOP, and ESC are further analyzed to capture the valuable information in the high SNR regime. Numerical results verify the correctness of analytical results, reveal the effects of the PS/TS ratio, and transmit the signal-to-noise ratio on secrecy performance.

Download Full-text

Improving Physical Layer Security via TAS and Full-Duplex Artificial-Noise-Added Receiver

Frequenz ◽

10.1515/freq-2014-0235 ◽

2015 ◽

Vol 69 (7-8) ◽

Author(s):

Yajun Zhang ◽

Tao Liang ◽

Aiwei Sun

Keyword(s):

Outage Probability ◽

Fading Channels ◽

Antenna Selection ◽

Signal To Noise Ratio ◽

Full Duplex ◽

Artificial Noise ◽

Secrecy Outage Probability ◽

Transmit Antenna Selection ◽

Single Antenna ◽

Secrecy Outage

AbstractIn this paper, we propose a hybrid scheme called transmit antenna selection and receiver’s artificial noise (TAS–rAN) for security enhancement in multiple-input single-output (MISO) wiretap channels. In this scheme, by using TAS protocol, the transmitter selects a single antenna that maximizes the instantaneous signal-to-noise ratio (SNR) at the full-duplex receiver. While the transmitter uses this antenna to transmit secrecy data, the full-duplex receiver would send artificial noise (AN) to confuse the potential eavesdropper. For the proposed protocol, we consider Rayleigh fading channels with different parameters for the main channel and the eavesdropper’s channel, and derive new closed-form expressions for the exact secrecy outage probability and the asymptotic secrecy outage probability. We demonstrate that the proposed TAS–

Download Full-text