A High Altitude Platform Station (HAPS) is a network node that operates in the stratosphere at an of altitude around 20 km and instrumental for providing communication services. Precipitated by technological innovations areas autonomous avionics, array antennas, solar panel efficiency levels, battery energy densities, fueled flourishing industry ecosystems, HAPS has emerged as indispensable com...

High-altitude platforms (HAPs) are one of the most promising alternative infrastructures for realizing next generation mobile communications networks. This paper utilizes a recently proposed three-dimensional (3-D) reference multiple-input multiple-output (MIMO) channel model for HAPs and investigates the capacity of spatially and temporally correlated HAP-MIMO channels. The effect of several p...

Nonterrestrial networks have been attracting much interest from the industry and academia. Satellites high-altitude platform station (HAPS) systems are expected to be key enablers of next-generation wireless networks. In this article, we introduce a novel downlink satellite communication (SatCom) model, where free-space optical (FSO) is adopted between HAPS node. A hybrid FSO/radio-frequency tr...

Abstract This paper presents the feasibility study of deploying quantum key distribution (QKD) from high altitude platforms (HAPs), as a way securing future communications applications and services. The provides thorough review state art HAP technologies summarises benefits that HAPs can bring to QKD A detailed link budget analysis is presented in evaluate delivering stratospheric flying at 20 ...

This paper sheds the light on coexistence and sharing between high altitude platform system (HAPS) and Fixed Services (FS) as a recently critical issue due to the spectrum shortage. International Telecommunications Union Radiocommunications sector (ITU-R) allocated the 5850-7075 MHz band for the operation of HAPS along with existing FS services. Therefore, coexistence and sharing requirements l...

The cerebrospinal fluid (CSF) proteome is of great interest for investigation of diseases and conditions involving the CNS. However, the presence of high-abundance proteins (HAPs) can interfere with the detection of low-abundance proteins, potentially hindering the discovery of new biomarkers. Therefore, an assessment of the CSF subproteome composition requires depletion strategies. Existing me...

In this letter, we consider a cognitive radio network consisting of broadcast satellite service (BSS), high-density fixed-satellite (HDFSS), and high-altitude platforms (HAPs) systems. The spectrum utilization within beam coverage is increased by deploying extra HAPs in the pre-determined hot-spot regions to existing systems which BSS HDFSS share frequency bands. Since multiple nodes simultaneo...