This paper studies a novel self-pilot tone based adaptive threshold return-to-zero on-off keying (RZ-OOK) decision for free-space optical (FSO) communications. RZ-OOK has the characteristics of impulse series in spectrum. Therefore, these impulses can be utilized as pilot tones transmitted signal to convey channel state information (CSI) FSO links. Then, CSI is extracted using local oscillator ...

Free-space optical (FSO) communications can offer high-capacity transmission owing to the properties of laser beams. However, performance degradation caused by atmospheric turbulence is an urgent issue. Recently, application polar codes, which provide capacity-achieving error-correcting with low computational cost for decoding, FSO has been studied. long-distance and real-field experiments have...

Free space optics (FSO) refers to optical wireless communications in outdoor environments. The aim of this article is analyze the role that FSO envisaged play creation next-generation satellite networks. To begin with, reader introduced types links and functionalities a basic system. Next, comparison radio frequency (RF) technologies for intersatellite (ISLs) provided, including between RF when...

In this paper, we analyze the secrecy outage performance for more realistic eavesdropping scenario of free-space optical (FSO) communications, where main and wiretap links are correlated. The FSO fading channels modeled by well-known Málaga distribution. Exact expressions metrics such as probability (SOP) non zero capacity (PNZSC) derived, asymptotic analysis on SOP is also conducted. obtained ...

Free space optical (FSO) communication involves the use of optical or laser beams to send the information through the atmosphere. The key towards our vision is the use of FSO technology which in contrast to traditional wireless of RF technologies has lower interference footprint, can support longer range and offers higher bandwidth. In this paper we review the recent advances made in the field ...

Free Space Optical (FSO) communications use modulated collimated light energy, usually in the form of an infrared (IR) laser, to transmit data. This affords FSO many appealing qualities such as a very high bandwidth capability, a high level of security through a low probability of detection (LPD) and a low probability of intercept (LPI), and a signal that is impervious to radio frequency (RF) i...

In this paper the per-node throughput and end-to-end delay of randomly deployed (i.e. ad-hoc) hybrid radio frequency free space optics (RF/FSO) networks is studied. The hybrid RF/FSO network consists of an RF ad hoc network of n nodes, f(n) of them, termed ‘super nodes’, are equipped with an additional FSO transceiver with transmission range s(n). Every RF and FSO transceiver is able to transmi...

The next generation (NG) optical technologies will unveil certain unique features, namely ultra-high data rate, broadband multiple services, scalable bandwidth, and flexible communications for manifold end-users. Among the technologies, free space (FSO) technology is a key element to achieve transmission according requirements of future which due its cost effective, easy deployment, high bandwi...

Recent studies have shown that satellite communication (SatCom) will a fundamental role in the next generation non-terrestrial networks (NTN). In SatCom, radio frequency (RF) or free-space optical (FSO) communications can be used depending on environment. Motivated by complementary nature of RF and FSO communication, we propose hybrid RF/FSO transmission strategy for where selects links weather...