Secure Communications in a Unified Non-Orthogonal Multiple Access Framework

04/02/2019
by   Xinwei Yue, et al.
0

This paper investigates the impact of physical layer secrecy on the performance of a unified non-orthogonal multiple access (NOMA) framework, where both external and internal eavesdropping scenarios are examined. The spatial locations of legitimate users (LUs) and eavesdroppers are modeled by invoking stochastic geometry. To characterize the security performance, new exact and asymptotic expressions of secrecy outage probability (SOP) are derived for both code-domain NOMA (CD-NOMA) and power-domain NOMA (PD-NOMA), in which imperfect successive interference cancellation (ipSIC) and perfect SIC (pSIC) are taken into account. For the external eavesdropping scenario, the secrecy diversity orders by a pair of LUs (the n-th user and m-th user) for CD/PD-NOMA are obtained. Analytical results make known that the diversity orders of the n-th user with ipSIC/pSIC for CD-NOMA and PD-NOMA are equal to zero/K and zero/one, respectively. The diversity orders of the m-th user are equal to K/one for CD/PD-NOMA. For the internal eavesdropping scenario, we examine the analysis of secrecy diversity order and observe that the m-th user to wiretap the n-th user with ipSIC/pSIC for CD-NOMA and PD-NOMA provide the diversity orders of zero/K and zero/one, respectively, which is consistent with external eavesdropping scenario. Numerical results are present to confirm the accuracy of the analytical results developed and show that: i) The secrecy outage behavior of the n-th user is superior to that of the m-th user; ii) By increasing the number of subcarriers, CD-NOMA is capable of achieving a larger secrecy diversity gain compared to PD-NOMA.

READ FULL TEXT

page 2

page 4

page 5

page 7

page 9

page 10

page 11

page 15

research
01/21/2019

A Unified Framework for Non-Orthogonal Multiple Access

This paper proposes a unified framework of non-orthogonal multiple acces...
research
07/31/2020

Secrecy Outage Probability Analysis for RIS-Assisted NOMA Systems

In this paper, the physical layer security (PLS) for a novel reconfigura...
research
06/10/2019

On the Secrecy Performance of NOMA Systems with both External and Internal Eavesdroppers

Sharing resource blocks in NOMA systems provides more opportunity to the...
research
08/17/2023

Secrecy Outage Probability Analysis for Downlink Untrusted NOMA Under Practical SIC Error

Non-orthogonal multiple access (NOMA) serves multiple users simultaneous...
research
10/21/2022

Physical Layer Security in Random NOMA-Enabled Heterogeneous Networks

The performance of physical layer secrecy approach in non-orthogonal mul...
research
04/30/2020

Secrecy Analysis of Ambient Backscatter NOMA Systems under I/Q Imbalance

We investigate the reliability and security of the ambient backscatter (...
research
08/17/2020

Securing OFDM-Based NOMA SWIPT Systems

In this paper, we present a physical-layer security scheme that exploits...

Please sign up or login with your details

Forgot password? Click here to reset