This paper investigates the performance of high altitude platforms (HAPS) based free-space optical (FSO) communication links including HAPS-to-ground station (downlink), ground-to-HAPS (uplink) and HAPS-to-HAPS (horizontal link) communications. The effects attenuation loss, atmospheric turbulence, pointing error angle-of-arrival (AOA) are taken into account. Also, application adaptive optics co...

In this letter, we investigate the problem of frame synchronization in a free-space optical (FSO) communications link, where known synch pattern is periodically embedded transmitted bitstream. The modulation format on-off keying (OOK) and electrical signal provided by photo-detector plagued mixture thermal shot noise with signal-dependent power. Due to atmospheric turbulence, channel attenuatio...

Free space optical (FSO) systems have become a reliable solution for modern communications networks, due to the high performance, availability, reliability and security they can provide. However, their characteristics depend strongly on conditions of atmosphere, which is propagation path beam. In this work, dependence experimentally investigated through terrestrial horizontal FSO link, was inst...

In this paper, we analyzed the diversity performance with increased pointing error caused by multiple beam transmissions for spatial based vertical free space optical (FSO) back-haul links. For power-limited FSO systems, technique can be employed to mitigate atmospheric fading issues in However, arrangement of transmitters achieve independent channels cause additional alignment errors misalignm...

Free-space optical (FSO) communication promises to bring fibre-like speeds data transmissions between ground, sky and space. This is becoming more important in light of the increasing volume collected by aircraft spacecraft. The University Western Australia (UWA) commissioning ground stations support FSO communications payloads. We propose retroreflected laser links drones as a useful step towa...

This work investigates the secrecy outage performance of uplink transmission a radio-frequency (RF)-free-space optical (FSO) hybrid cooperative satellite-aerial-terrestrial network (SATN). Specifically, in considered SATN, terrestrial source (S) transmits its information to satellite receiver (D) via help cache-enabled aerial relay (R) terminal with most popular content caching scheme, while gr...

We study a high throughput satellite system, where the feeder link uses free-space optical (FSO) and user radio frequency (RF) communication. In particular, we first propose transmit diversity using Alamouti space time block coding to mitigate atmospheric turbulence in link. Then, based on concept of average virtual signal-to-interference-plus-noise ratio one-bit feedback, beamforming algorithm...

The interest in fast and secure optical communication link has grown in the last years driven by the increasing demand in data throughput for applications spanning from small satellites for global services to large satellites for secure communications, from Earth Observation distributed sensing networks to CubeSat constellations for in-orbit inspections of large satellites; in addition particul...

A free space optical (FSO)/radio frequency (RF) dual mode communication transmitter using a LED integrated within the geometry of a planar patch antenna on a shared substrate is demonstrated. An experimental FSO link is constructed with a bare die visible LED and a commercial silicon photodetector. The antenna radiating at a centre frequency of 10 GHz, provides a simultaneously operated backup ...

Free space optical (FSO) also known as free space photonics (FSS) is a technology widely deployed in Local Area Network (LAN), Metro Area Network (MAN), and in Inter & Intra chip communications. However satellite to satellite and other space use of FSO requires further consideration. Although FSO is highly beneficial due to its easy deployment and high security in narrow beam as well as market ...