Physical Layer Security of Multiuser Satellite Communication Systems With Channel Estimation Error and Multiple Eavesdroppers

Kefeng Guo,Kang An,Bangning Zhang,Yuzhen Huang

doi:10.1109/access.2019.2928751

Abstract

This paper investigates the physical layer security (PLS) for the transmission of confidential information over satellite communication systems under unified framework. The generalized shadowed-Rician (SR) fading is utilized to model the satellite channel, and multiple legitimate users are served to cooperatively receive the broadcast signal with a cluster of unauthorized eavesdroppers. In particular, the channel estimation error (CEE) is considered for both the legitimate user and eavesdropping links. Based on the practical channel modeling, we derive the closed-form expressions for the probability of strictly positive secrecy capacity (PSPSC), secrecy outage probability (SOP), and average secrecy capacity (ASC) of the considered satellite communication system in the presence of imperfect channel estimation (ICE), which can provide efficient methods to evaluate the impacts of various propagation parameters on the secrecy performance. In order to obtain further insights into the key parameters on the secrecy performance at high signal-to-noise ratios (SNRs), the asymptotic expressions of the SOP and ASC are also derived. Monte Carlo simulation results are provided to verify the correctness of our performance analysis.

Highlights

Satellite communication system has attracted significant attention due to its wide coverage and high efficiency [1]–[3]
We focus on the physical layer security (PLS) in satellite communication systems with channel estimation errors (CEEs) over generalized fading channel, where multiple legitimate users and multiple eavesdroppers are considered in the system
It is observed that the obtained theoretical results match well with Monte Carlo simulations over the entire signal-to-noise ratios (SNRs), which implies that the derived expressions can accurately evaluate the probability of strictly positive secrecy capacity (PSPSC) performance of the considered system

Summary

INTRODUCTION

Satellite communication system has attracted significant attention due to its wide coverage and high efficiency [1]–[3]. In [14], the secrecy performance was investigated against eavesdropping of satellite system with multiple antennas legitimate user and eavesdropper, respectively. In [17], [18], the secrecy performance for satellite communication systems with multiple legitimate users and one eavesdropper existing was analyzed. Until now, there is few published paper analyzing the secrecy performance for satellite communication system with multiple legitimate users and multiple eavesdroppers. Trying the best of the authors’ knowledge, the impact of ICE on the secrecy performance for satellite communication system with multiple legitimate users and multiple eavesdroppers remains unreported, which motivates the contribution of this paper. We focus on the PLS in satellite communication systems with channel estimation errors (CEEs) over generalized fading channel, where multiple legitimate users and multiple eavesdroppers are considered in the system. Notations: |·| stands for the absolute value of a complex scalar. exp (·) is the exponential function, E [·] denotes the expectation operator, CN (a, B) represents the complex Gaussian distribution of a random coefficient a and covariance B. fx (·) and Fx (·) denote the probability density function (PDF) and the cumulative distribution function (CDF) of random variable x, respectively

SYSTEM MODEL AND PROBLEM FORMULATION

PRIMARY RESULTS

AVERAGE SECRECY CAPACITY

ASYMPTOTIC SYSTEM PERFORMANCE

NUMERICAL RESULTS

CONCLUSIONS