scholarly journals Secrecy Performance of Eigendecomposition-Based FTN Signaling and NOFDM in Quasi-Static Fading Channel

2021 ◽  
Author(s):  
Shinya Sugiura
Keyword(s):  
Outage Probability ◽  
Fading Channel ◽  
Orthogonal Frequency Division Multiplexing ◽  
Secrecy Outage Probability ◽  
Secrecy Rate ◽  
Wiretap Channel ◽  
Information Theoretic ◽  
Single Carrier ◽  
Secrecy Outage ◽  
Eigen Decomposition

<p>In this paper, we investigate the information-theoretic secrecy performance of recent precoded faster-than-Nyquist signaling (FTN) with the aid of optimal power allocation in eigenspace. More specifically, the secrecy rate and secrecy outage probability of a fading wiretap channel, which was derived for classical Nyquist-based orthogonal signaling transmission ,is extended to those of our eigen decomposition-based FTN (E-FTN) signaling for a quasi-static frequency-flat Rayleigh fading channel. Our performance results demonstrate that the proposed E-FTN signaling scheme exhibits improvements in secrecy rate and secrecy outage probability over conventional Nyquist-based and FTN signaling transmissions. We also show that the same benefits as those of single-carrier E-FTN signaling are attainable by its non-orthogonal multicarrier counterpart, where subcarrier spacing is set lower than that of orthogonal frequency-division multiplexing.<br></p><p><br></p><p>Postprint accepted on 1 April 2021 for publication in IEEE Transactions on Wireless Communications (DOI: 10.1109/TWC.2021.3070891). (c) 2021 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.</p>

scholarly journals On the Zero-Outage Secrecy-Capacity of Dependent Fading Wiretap Channels

Entropy ◽  
2022 ◽  
Vol 24 (1) ◽  
pp. 99
Author(s):  
Eduard Jorswieck ◽  
Pin-Hsun Lin ◽  
Karl-Ludwig Besser
Keyword(s):  
Outage Probability ◽  
Fading Channels ◽  
Positive Zero ◽  
Dependence Structure ◽  
Secrecy Outage Probability ◽  
Secrecy Capacity ◽  
Secrecy Rate ◽  
Wiretap Channel ◽  
Dependency Structure ◽  
Dependency Structures

It is known that for a slow fading Gaussian wiretap channel without channel state information at the transmitter and with statistically independent fading channels, the outage probability of any given target secrecy rate is non-zero, in general. This implies that the so-called zero-outage secrecy capacity (ZOSC) is zero and we cannot transmit at any positive data rate reliably and confidentially. When the fading legitimate and eavesdropper channels are statistically dependent, this conclusion changes significantly. Our work shows that there exist dependency structures for which positive zero-outage secrecy rates (ZOSR) are achievable. In this paper, we are interested in the characterization of these dependency structures and we study the system parameters in terms of the number of observations at legitimate receiver and eavesdropper as well as average channel gains for which positive ZOSR are achieved. First, we consider the setting that there are two paths from the transmitter to the legitimate receiver and one path to the eavesdropper. We show that by introducing a proper dependence structure among the fading gains of the three paths, we can achieve a zero secrecy outage probability (SOP) for some positive secrecy rate. In this way, we can achieve a non-zero ZOSR. We conjecture that the proposed dependency structure achieves maximum ZOSR. To better understand the underlying dependence structure, we further consider the case where the channel gains are from finite alphabets and systematically and globally solve the ZOSC. In addition, we apply the rearrangement algorithm to solve the ZOSR for continuous channel gains. The results indicate that the legitimate link must have an advantage in terms of the number of antennas and average channel gains to obtain positive ZOSR. The results motivate further studies into the optimal dependency structures.

scholarly journals On the Secrecy Outage of Wiretap Channel

2020 ◽  
Vol 9 (10) ◽  
pp. 254-259
Keyword(s):  
Outage Probability ◽  
Fading Channels ◽  
Data Transmission ◽  
Rician Fading ◽  
Secrecy Outage Probability ◽  
Wireless Data ◽  
Wiretap Channel ◽  
Wireless Data Transmission ◽  
Secrecy Outage ◽  
Rician Fading Channels

In wireless data transmission, providing security over communication channels has become a growing concern. Traditionally cryptography is used to provide secrecy. However, physical layer studies show that it allows a huge potential in providing secrecy. In this paper, secrecy outage probability is derived for Rician fading channels. A new secrecy metric Generalized Secrecy Outage Probability(GSOP) derivation is considered to overcome the limitation of traditional Outage probability for both passive and active cases of eavesdropping.

scholarly journals On Secrecy Outage Probability and Average Secrecy Rate of Large-Scale Cellular Networks

2018 ◽  
Vol 2018 ◽  
pp. 1-14 ◽  
Author(s):  
Liwei Tao ◽  
Weiwei Yang ◽  
Yueming Cai ◽  
Dechuan Chen
Keyword(s):  
Outage Probability ◽  
Cellular Networks ◽  
Large Scale ◽  
Point Processes ◽  
Base Stations ◽  
Small Scale ◽  
Secrecy Outage Probability ◽  
Secrecy Rate ◽  
Transmit Antenna Selection ◽  
Secrecy Outage

We investigate the secrecy performance in large-scale cellular networks, where both Base Stations (BSs) and eavesdroppers follow independent and different homogeneous Poisson point processes (PPPs). Based on the distances between the BS and user, the intended user selects the nearest BS as serving BS to transmit the confidential information. We first derive closed-formed expressions of secrecy outage probability and average secrecy rate of a single-antenna system for both noncooperative and cooperative eavesdroppers scenarios. Then, to further improve the secrecy performance through additional spatial degrees of freedom, the above analyses generalize to the multiantenna scenario, where BSs employ the transmit antenna selection (TAS) scheme. Finally, the results show the small-scale fading has a considerable effect on the secrecy performance in certain density of eavesdroppers and small path loss exponent environment, and when the interference caused by BS is considered, the secrecy performance will be reduced. Moreover, the gap of secrecy performance between noncooperative and cooperative eavesdroppers cases is nearly invariable as the number of antennas increases.

scholarly journals On the Secrecy Performance of SWIPT Receiver Architectures with Multiple Eavesdroppers

2018 ◽  
Vol 2018 ◽  
pp. 1-12 ◽  
Author(s):  
Furqan Jameel ◽  
Shurjeel Wyne ◽  
Syed Junaid Nawaz ◽  
Junaid Ahmed ◽  
Kanapathippillai Cumanan
Keyword(s):  
Outage Probability ◽  
Secret Message ◽  
Secrecy Outage Probability ◽  
New Paradigm ◽  
Secrecy Rate ◽  
Channel Dynamics ◽  
Imperfect Channel Estimation ◽  
Constant Rate ◽  
Secrecy Outage ◽  
Cryptographic Techniques

Physical layer security (PLS) has been shown to hold promise as a new paradigm for securing wireless links. In contrast with the conventional cryptographic techniques, PLS methods exploit the random fading in wireless channels to provide link security. As the channel dynamics prevent a constant rate of secure communications between the legitimate terminals, the outage probability of the achievable secrecy rate is used as a measure of the secrecy performance. This work investigates the secrecy outage probability of a simultaneous wireless information and power transfer (SWIPT) system, which operates in the presence of multiple eavesdroppers that also have the energy harvesting capability. The loss in secrecy performance due to eavesdropper collusion, i.e., information sharing between the eavesdroppers to decode the secret message, is also analyzed. We derive closed-form expressions for the secrecy outage probability for Nakagami-m fading on the links and imperfect channel estimation at the receivers. Our analysis considers different combinations of the separated and the integrated SWIPT receiver architectures at the receivers. Numerical results are provided to validate our analysis.

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

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.

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