Secure Satellite Communication Systems Design With Individual Secrecy Rate Constraints

Abstract

In this paper, we study multibeam satellite secure communication through physical (PHY) layer security techniques, i.e., joint power control and beamforming. By first assuming that the Channel State Information (CSI) is available and the beamforming weights are fixed, a novel secure satellite system design is investigated to minimize the transmit power with individual secrecy rate constraints. An iterative algorithm is proposed to obtain an optimized power allocation strategy. Moreover, sub-optimal beamforming weights are obtained by completely eliminating the co-channel interference and nulling the eavesdroppers' signal simultaneously. In order to obtain jointly optimized power allocation and beamforming strategy in some practical cases, e.g., with certain estimation errors of the CSI, we further evaluate the impact of the eavesdropper's CSI on the secure multibeam satellite system design. The convergence of the iterative algorithm is proven under justifiable assumptions. The performance is evaluated by taking into account the impact of the number of antenna elements, number of beams, individual secrecy rate requirement, and CSI. The proposed novel secure multibeam satellite system design can achieve optimized power allocation to ensure the minimum individual secrecy rate requirement. The results show that the joint beamforming scheme is more favorable than fixed beamforming scheme, especially in the cases of a larger number of satellite antenna elements and higher secrecy rate requirement. Finally, we compare the results under the current satellite air-interface in DVB-S2 and the results under Gaussian inputs. Index TermsMultibeam satellite, beamforming, physical layer security, and power allocation.

Robust Chance-Constrained Secure Transmission for Cognitive Satellite–Terrestrial Networks

“…Based on Lemma 2 and then applying the SDR to omit the rank-one constraint (26e), the robust power minimization problem (26) can be reformulated as a convex SDP problem given by (29), as shown at the top of next page. The optimal solution to SDP (29) can be effectively found via existing optimization tools, e.g., SeduMi or CVX [44].…”

“…In the seminal work of [26], Lei et al studied the security oriented beamforming and power control in a multibeam satellite communication in order to minimize the transmit power, while maintaining individual secrecy rate constraint. Subsequently, [27] proposed the optimal strategy design to improve the security of multibeam satellite communication, and the artificial noise was explored as an additional degree-of-freedom to protect against Eves.…”

“…In general, there are two classes of models to characterize imperfect CSI: the deterministic (worst-case) and stochastic uncertainty models. Taking the deterministic uncertainty model into account, a growing body of robust secure transmission for satellite communications has been studied in [26], [27], in which the CSI uncertainty is bounded by possible values. We note that the worst-case setting characterized by deterministic uncertainty model infrequently occurs and may not reflect practical channels accurately.…”

Secrecy rate balancing for the downlink multiuser MISO system with independent confidential messages

“…However, because of the inherent broadcast nature, wireless communication exposes not only vulnerabilities to eavesdropping attacks from external eavesdroppers, but also confidentiality concerns among legitimate users. For multiuser systems, secure transmissions against external eavesdroppers have been substantially studied in the area of physical layer security [1]- [5]. However, the confidentiality concern among legitimate users has drawn relatively little attention.…”

“…Thus in [11] and [12], rate or SINR balancing was studied for the multiuser broadcast channel without secrecy. And in [5], secure transmission against a single external eavesdropper was designed for satellite communication systems with individual secrecy rate constraints.…”