Abstract
Hybrid terrestrial-satellite (HTS) communication systems have gained a tremendous amount of interest recently due to the high demand for global high data rates. Conventional satellite communications operate in the conventional Ku (12 GHz) and Ka (26.5-40 GHz) radio-frequency bands for assessing the feeder link, between the ground gateway and the satellite. Nevertheless, with the aim to provide hundreds of Mbps of throughput per each user, free-space optical (FSO) feeder links have been proposed to fulfill these high data rates requirements. In this paper, we investigate the physical layer security performance for a hybrid very high throughput satellite communication system with an FSO feeder link. In particular, the satellite receives the incoming optical wave from an appropriate optical ground station, carrying the data symbols of N users through various optical apertures and combines them using the selection combining technique. Henceforth, the decoded and regenerated information signals of the N users are zero-forcing (ZF) precoded in order to cancel the interbeam interference at the end-users. The communication is performed under the presence of malicious eavesdroppers nodes at both hops. Statistical properties of the signal-to-noise ratio of the legitimate and wiretap links at each hop are derived, based on which the intercept probability metric is evaluated. The derived results show that above a certain number of optical apertures, the secrecy level is not improved further. Also, the system's secrecy is improved using ZF precoding compared to the no-precoding scenario for some specific nodes' positions. All the derived analytical expressions are validated through Monte Carlo simulations.
Highlights
T HROUGHOUT the last few years, satellite communication (SatCom) has been a tremendously evolving segment of the wireless communication industry, due to the increasing global demand on broadband satellite communication links [1]
Several works in the literature have dealt with the secrecy level of Hybrid terrestrial-satellite (HTS) systems as in [22]–[24], where the analysis carried out the performance of HTS relay-based networks, where the feeder link operates on RF spectrum
Capitalizing on this, we aim at this work to investigate the physical layer (PHY) layer security of an HTS multi-user relay-based system with an optical feeder link, where the satellite, acting as a relay, converts the incoming optical wave carrying the users’ data, after combining the incoming beams to its photodetectors through SC scheme, to an electrical signal, regenerate and conveys them to the end-users
Summary
T HROUGHOUT the last few years, satellite communication (SatCom) has been a tremendously evolving segment of the wireless communication industry, due to the increasing global demand on broadband satellite communication links [1]. Potential eavesdroppers might be located in the same zone as the legitimate users, and the secrecy level of the user link is affected To this end, several works in the literature have dealt with the secrecy level of HTS systems as in [22]–[24], where the analysis carried out the performance of HTS relay-based networks, where the feeder link operates on RF spectrum. Capitalizing on this, we aim at this work to investigate the PHY layer security of an HTS multi-user relay-based system with an optical feeder link, where the satellite, acting as a relay, converts the incoming optical wave carrying the users’ data, after combining the incoming beams to its photodetectors through SC scheme, to an electrical signal, regenerate and conveys them to the end-users. NOTATIONS For a better readability, Table 1 summarizes the different notations used throughout the paper
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