scholarly journals A PHY Layer Security Analysis of Uplink Cooperative Jamming-Based Underlay CRNs with Multi-Eavesdroppers

2019 ◽  
Author(s):  
Mounia Bouabdellah ◽  
Faissal El Bouanani ◽  
Mohamed-Slim Alouini
Keyword(s):  
Fading Channels ◽  
Multiple Antennas ◽  
Security Analysis ◽  
Base Station ◽  
Artificial Noise ◽  
Cooperative Jamming ◽  
Maximum Ratio Combining ◽  
Single Antenna ◽  
Asymptotic Expressions ◽  
The Impact

p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 9.0px Helvetica} span.s1 {font: 7.5px Helvetica} <p>xAbstract—In this paper, the physical layer security of a dualhop</p> <p>underlay uplink cognitive radio network is investigated over</p> <p>Nakagami-m fading channels. Specifically, multiple secondary</p> <p>sources are taking turns in accessing the licensed</p> <p>spectrum of the primary users and communicating with a multiantenna</p> <p>secondary base station (D) through the aid of a multiantenna</p> <p>relay R in the presence of M eavesdroppers </p> <p>that are also equipped with multiple antennas. Among the</p> <p>remaining nodes, one jammer is randomly selected to transmit</p> <p>an artificial noise to disrupt all the eavesdroppers that are</p> <p>attempting to intercept the communication of the legitimate links</p> <p>i.e., Si -R and R-D. The received signals at each node are combined</p> <p>using maximum-ratio combining. Secrecy analysis is provided by</p> <p>deriving closed-form and asymptotic expressions for the secrecy</p> <p>outage probability. The impact of several key parameters on the</p> <p>system’s secrecy e.g., transmit power of the sources, number of</p> <p>eavesdroppers, maximum tolerated interference power, and the</p> <p>number of diversity branches is investigated. Importantly, by</p> <p>considering two scenarios, namely (i) absence and (ii) presence</p> <p>of a friendly jammer, new insights are obtained for the considered</p> <p>communication system. Especially, we tend to answer to the</p> <p>following question: Can better secrecy be achieved without</p> <p>jamming by considering a single antenna at eavesdroppers</p> <p>and multiple-ones at the legitimate users (i.e., relay and enduser)</p> <p>rather than sending permanently an artificial noise and</p> <p>considering that both the relay and the destination are equipped</p> <p>with a single antenna, while multiple antennas are used by the</p> <p>eavesdroppers? The obtained results are corroborated through</p> <p>Monte Carlo simulation and show that the system’s security can</p> <p>be enhanced by adjusting the aforementioned parameters.</p>

scholarly journals A PHY Layer Security Analysis of Uplink Cooperative Jamming-Based Underlay CRNs with Multi-Eavesdroppers

2019 ◽  
Author(s):  
Mounia Bouabdellah ◽  
Faissal El Bouanani ◽  
Mohamed-Slim Alouini
Keyword(s):  
Fading Channels ◽  
Multiple Antennas ◽  
Security Analysis ◽  
Base Station ◽  
Artificial Noise ◽  
Cooperative Jamming ◽  
Maximum Ratio Combining ◽  
Single Antenna ◽  
Asymptotic Expressions ◽  
The Impact

p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 9.0px Helvetica} span.s1 {font: 7.5px Helvetica} <p>xAbstract—In this paper, the physical layer security of a dualhop</p> <p>underlay uplink cognitive radio network is investigated over</p> <p>Nakagami-m fading channels. Specifically, multiple secondary</p> <p>sources are taking turns in accessing the licensed</p> <p>spectrum of the primary users and communicating with a multiantenna</p> <p>secondary base station (D) through the aid of a multiantenna</p> <p>relay R in the presence of M eavesdroppers </p> <p>that are also equipped with multiple antennas. Among the</p> <p>remaining nodes, one jammer is randomly selected to transmit</p> <p>an artificial noise to disrupt all the eavesdroppers that are</p> <p>attempting to intercept the communication of the legitimate links</p> <p>i.e., Si -R and R-D. The received signals at each node are combined</p> <p>using maximum-ratio combining. Secrecy analysis is provided by</p> <p>deriving closed-form and asymptotic expressions for the secrecy</p> <p>outage probability. The impact of several key parameters on the</p> <p>system’s secrecy e.g., transmit power of the sources, number of</p> <p>eavesdroppers, maximum tolerated interference power, and the</p> <p>number of diversity branches is investigated. Importantly, by</p> <p>considering two scenarios, namely (i) absence and (ii) presence</p> <p>of a friendly jammer, new insights are obtained for the considered</p> <p>communication system. Especially, we tend to answer to the</p> <p>following question: Can better secrecy be achieved without</p> <p>jamming by considering a single antenna at eavesdroppers</p> <p>and multiple-ones at the legitimate users (i.e., relay and enduser)</p> <p>rather than sending permanently an artificial noise and</p> <p>considering that both the relay and the destination are equipped</p> <p>with a single antenna, while multiple antennas are used by the</p> <p>eavesdroppers? The obtained results are corroborated through</p> <p>Monte Carlo simulation and show that the system’s security can</p> <p>be enhanced by adjusting the aforementioned parameters.</p>

scholarly journals Rate-Splitting Multiple Access for Intelligent Reflecting Surface aided Multi-User Communications

2021 ◽  
Author(s):  
Ankur Bansal ◽  
Keshav Singh ◽  
Bruno Clerckx ◽  
Chih-Peng Li ◽  
Mohamed-Slim Alouini
Keyword(s):  
Interference Cancellation ◽  
Multiple Access ◽  
Base Station ◽  
Control Technique ◽  
Decode And Forward ◽  
Cell Edge ◽  
Single Antenna ◽  
Rate Splitting ◽  
Reflecting Surface ◽  
The Impact

Intelligent reflecting surface (IRS) has recently emerged as a promising technology for 6G wireless systems, due to its capability to reconfigure the wireless propagation environment. In this paper, we investigate a Rate-Splitting Multiple Access (RSMA) for IRS-assisted downlink system, where the base station (BS) communicates with single-antenna users with the help of an IRS. RSMA relies on rate-splitting (RS) at the BS and successive interference cancellation (SIC) at the users and provides a generalized multiple access framework. We derive a new architecture called IRS-RS that leverages the interplay between RS and IRS. For performance analysis, we utilize an \textit{on-off control technique} to control the passive beamforming vector of the IRS-RS and derive the closed-form expressions for outage probability of cell-edge users and near users. Moreover, we also analyze the outage behavior of cell-edge users for a sufficiently large number of reflecting elements. Additionally, we also analyze the outage performance of cooperative RS based decode-and-forward (DF)-assisted framework called DF-RS. Through simulation results, it is shown that the proposed framework outperforms the corresponding DF-RS, RS without IRS and IRS-assisted conventional non-orthogonal multiple access (NOMA) schemes. Furthermore, the impact of various system's parameters such as the number of IRS reflecting elements and the number of users on the system performance is revealed.

scholarly journals Capacity Analysis and Linear Detection in Massive MIMO for 5G Wireless Systems

2019 ◽  
Vol 8 (9) ◽  
pp. 2938-2943
Keyword(s):  
Massive Mimo ◽  
Multiple Input Multiple Output ◽  
Symbol Error Rate ◽  
Base Station ◽  
Matlab Simulation ◽  
Maximum Ratio Combining ◽  
Single Antenna ◽  
Air Interface ◽  
Multiple Input ◽  
Input Multiple Output

Multiple Input Multiple Output (MIMO) is an attractive air interface solution which is used in the 4 th generation wireless networks to achieve higher data rate. With a very large antenna array in Massive MIMO the capacity will increase drastically. In this paper channel capacity comparison for MIMO using known Channel State Information (CSI) and unknown CSI has been carried out for a higher number of antennas at transmitter and receiver side. It has shown that at lower SNR known CSI will give better performance compared to unknown CSI. At higher SNR known CSI and unknown CSI will provide similar results. Capacity comparison has been evaluated with help of MATLAB for known CSI and unknown CSI from a small number of antennas to hundred of antennas. Also, the performance evaluated with MATLAB simulation of linear detectors zero-forcing (ZF) and maximum ratio combining (MRC) method for large number of antennas at Base station (BS) which are serving a small number of single antenna users. Performance is evaluated in terms of Symbol Error Rate (SER) for ZF and MRC, and results show that ZF will outperform MRC. It has also been analyzed that increasing the antennas at BS for a small number of users will also help to reduce SER.

scholarly journals Security Analysis of Multi-Antenna NOMA Networks Under I/Q Imbalance

Electronics ◽  
2019 ◽  
Vol 8 (11) ◽  
pp. 1327 ◽  
Author(s):  
Xingwang Li ◽  
Mengle Zhao ◽  
Changsen Zhang ◽  
Wali Ullah Khan ◽  
Jun Wu ◽  
...  
Keyword(s):  
Fading Channels ◽  
Signal To Noise Ratio ◽  
Security Analysis ◽  
Base Station ◽  
Selection Combining ◽  
High Signal ◽  
Asymptotic Results ◽  
Intercept Probability ◽  
Outage Probabilities ◽  
Analytical Expressions

This paper investigates the reliability and security performance of the downlink non-orthogonal multiple access (NOMA) networks over Nakagami-m fading channels, where the base station (BS) aims to communicate with multi-antenna NOMA users in the presence of a multi-antenna eavesdropper. To be more practical, a detrimental factor at both transmitter and receiver is considered, namely in-phase and quadrature-phase imbalance (IQI). To further improve the reliability and security of the considered networks, the selection combining (SC) algorithm at the receiver is taken into account. More specifically, the exact analytical expressions for the outage probability (OP) and the intercept probability (IP) are derived in closed-form. To obtain a better understanding of the influence for the IQI parameters on the system performance, the asymptotic behaviors for the outage probabilities (OPs) in the high signal-to-noise ratio (SNR) region are analyzed. Based on the asymptotic results, the diversity order of the considered system are obtained and discussed. The numerical results are presented to verify the validity of the theoretical analysis.

scholarly journals On secure system performance over SISO, MISO and MIMO-NOMA wireless networks equipped a multiple antenna based on TAS protocol

2020 ◽  
Vol 2020 (1) ◽  
Author(s):  
Thanh-Nam Tran ◽  
Miroslav Voznak
Keyword(s):  
Fading Channels ◽  
System Performance ◽  
Interference Cancellation ◽  
Base Station ◽  
System Throughput ◽  
Experimental Investigations ◽  
Single Input Single Output ◽  
Single Antenna ◽  
Single Output ◽  
The Individual

AbstractThis study examined how to improve system performance by equipping multiple antennae at a base station (BS) and all terminal users/mobile devices instead of a single antenna as in previous studies. Experimental investigations based on three NOMA down-link models involved (1) a single-input-single-output (SISO) scenario in which a single antenna was equipped at a BS and for all users, (2) a multi-input-single-output (MISO) scenario in which multiple transmitter antennae were equipped at a BS and a single receiver antenna for all users and (3) a multi-input-multi-output (MIMO) scenario in which multiple transmitter antennae were equipped at a BS and multiple receiver antenna for all users. This study investigated and compared the outage probability (OP) and system throughput assuming all users were over Rayleigh fading channels. The individual scenarios also each had an eavesdropper. Secure system performance of the individual scenarios was therefore also investigated. In order to detect data from superimposed signals, successive interference cancellation (SIC) was deployed for users, taking into account perfect, imperfect and fully imperfect SICs. The results of analysis of users in these three scenarios were obtained in an approximate closed form by using the Gaussian-Chebyshev quadrature method. However, the clearly and accurately presented results obtained using Monte Carlo simulations prove and verify that the MIMO-NOMA scenario equipped with multiple antennae significantly improved system performance.

scholarly journals Outage Analysis of Distributed Antenna Systems in a Composite Fading Channel with Correlated Shadowing

2018 ◽  
Vol 7 (3) ◽  
pp. 32 ◽  
Author(s):  
Muhammad Imran ◽  
Haejoon Jung
Keyword(s):  
Fading Channels ◽  
Communication Systems ◽  
Large Scale ◽  
Multiple Antennas ◽  
Path Loss ◽  
Distributed Antenna Systems ◽  
Correlated Shadowing ◽  
Distributed Antenna ◽  
The Impact ◽  
Antenna Systems

Distributed antenna systems (DASs) are known to be effective to enhance coverage, spectral efficiency, and reliability in mobile communication systems. Because multiple antennas are physically separated in space, DASs benefit from both micro- and macro-diversity, which makes DASs significantly more robust compared to conventional co-located antenna systems in fading channels. However, when multiple antennas are not dispersed enough, there exists a certain degree of correlation in large-scale fading (shadowing), which degrades the macro-diversity gain. In practice, various measurements indicate a high degree of correlation of shadowing in DASs. However, most of the previous studies on DASs have not considered the correlated shadowing and its corresponding performance loss. Motivated by this limitation, we analyze the impact of the correlated shadowing to better evaluate DAS-based schemes with dual diversity transmitters. Assuming that shadowing correlation is an exponentially decreasing function of the inter-element separation, we derive the outage probability of DAS in composite Rayleigh-lognormal shadowing channels. Also, we present numerical and simulation results, which indicate there exists an optimal inter-separation between antennas that minimizes the outage rate to balance a trade-off between macro-diversity and path loss.

scholarly journals Performance Analysis of Cognitive Relay-Assisted Ambient Backscatter with MRC over Nakagami-m Fading Channels

Sensors ◽  
2020 ◽  
Vol 20 (12) ◽  
pp. 3447
Author(s):  
Dinh-Thuan Do ◽  
Thanh-Luan Nguyen ◽  
Byung Moo Lee
Keyword(s):  
Performance Analysis ◽  
Fading Channels ◽  
System Performance ◽  
Throughput Performance ◽  
Maximum Ratio Combining ◽  
Backscatter Communication ◽  
Simulation Results ◽  
Outage Probabilities ◽  
The Impact ◽  
Ambient Backscatter

This study presents ambient backscatter communication (AmBC) network as a concept of "modulation in the air" that has drawn growing interest by both academia and industry recently. In particular, we investigate and analyze an AmBC system relying on cognitive radio, where the primary destination is equipped with multiple antennas and maximum ratio combining (MRC). A wireless powered relay is necessary to serve both primary and secondary destinations. Benefiting from the surrounding radio frequency (RF) source, the relay can support the backscattering signal. To facilitate the performance analysis of received nodes, this study presents exact closed-form expressions of the outage probability. For comparison, the outage and throughput performance of these nodes are considered in numerical simulation. Taking advantage of the AmBC technology, the impact of the backscatter ratio on system performance is carefully studied considering various other parameters. Simulation results demonstrate the exactness of the derived outage probabilities and show that the optimal throughput performance can be achieved at specific parameters.

scholarly journals A new look on performance of small-cell network with design of multiple antennas and full-duplex

2021 ◽  
Vol 10 (4) ◽  
pp. 2302-2309
Author(s):  
Chi-Bao Le ◽  
Dinh-Thuan Do
Keyword(s):  
Outage Probability ◽  
Multiple Antennas ◽  
Base Station ◽  
Small Cell ◽  
Full Duplex ◽  
Closed Form Expression ◽  
Outage Performance ◽  
Cell Network ◽  
Small Cell Network ◽  
The Impact

A downlink of small-cell network is studied in this paper studies in term of outage performance. We benefit by design of multiple antennas at the base station and fullduplex transmission mode. The scenario of multiple surrounded small-cell networks is considered to look the impact of interference. We derive the closed-form expression of outage probability to show performance of mobile user. We investigate target rate is main factor affecting to outage performance. According to the considered system, simulation results indicate reasonable value of outage probability and throughput as well. Finally, Monte-Carlo simulation method is deployed to determine exactness of main results found in this article. Finally, the considered system can exhibit improved performance if controlling interference term.

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