The Role of High-Altitude Platforms (HAPs) in the Global Wireless Connectivity

Mohammed, Abbas; Mehmood, Asad; Pavlidou, Fotini‐Niovi; Mohorčič, Mihael

doi:10.1109/jproc.2011.2159690

Cited by 166 publications

(103 citation statements)

References 39 publications

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“…While satellites can deliver wireless service to users in remote areas, their spectral efficiency is limited by their large footprints [1]. Meanwhile, terrestrial communication systems cannot guarantee a reliable service for users in remote, rural areas, due to the lack of infrastructure nodes, such as base stations (BSs).…”

Section: Introductionmentioning

confidence: 99%

“…In this scenario, we show that it is possible to achieve the maximum possible sum-rate by exploiting the IA scheme. Moreover, we derive a closed- 1 An HAP drones-GSs wireless system in which each HAP drone carries a dedicated symbol for each GS can be modeled as an X network. The X network houses all possible channel models such as the interference channel, the Y channel, and the Z channel.…”

Section: Introductionmentioning

confidence: 99%

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Sum-Rate Analysis for High Altitude Platform (HAP) Drones With Tethered Balloon Relay

et al. 2018

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Abstract-High altitude platform (HAP) drones can provide broadband wireless connectivity to ground users in rural areas by establishing line-of-sight (LoS) links and exploiting effective beamforming techniques. However, at high altitudes, acquiring the channel state information (CSI) for HAPs, which is a key component to perform beamforming, is challenging. In this paper, by exploiting an interference alignment (IA) technique, a novel method for achieving the maximum sum-rate in HAPbased communications without CSI is proposed. In particular, to realize IA, a multiple-antenna tethered balloon is used as a relay between multiple HAP drones and ground stations (GSs). Here, a multiple-input multiple-output X network system is considered. The capacity of the considered M ×N X network with a tethered balloon relay is derived in closed-form. Simulation results corroborate the theoretical findings and show that the proposed approach yields the maximum sum-rate in multiple HAPs-GSs communications in absence of CSI. The results also show the existence of an optimal balloon's altitude for which the sum-rate is maximized.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Sum-Rate Analysis for High Altitude Platform (HAP) Drones With Tethered Balloon Relay

et al. 2018

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“…Stratospheric winds are still mystery for researchers to emphasize on whether HAPS can provide wireless service reliably without short term interference or not during the problem of instability. Accordingly a good research material has been done to evaluate the effect of instability on wireless link in [6]. The main problem of this research, which due to rotation and rapid burst of stratospheric wind the platform might not provide acceptable or stable services to the system.…”

Section: Introductionmentioning

confidence: 99%

Stratospheric Winds and Rain Effect on HAPS Backhaul Link Performance

Abdulrazak

2017

KJAR

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“…S1.66A as -a station located on an object at an altitude of 20 to 50 km and at a specified, nominal, fixed point relative to the earth‖ and carrying communications payloads. The HAPs provide many attractive features and superior performance compared to the conventional terrestrial and satellite technology such as the line-of-sight communications, lower transmission power and reduced time delays [6][7][8][9][10][11][12][13][14][15][16]. The HAP makes it possible for establishing Wide-Area Wireless Sensor Network (WAWSN) where several hundreds of kilometers breadth can be covered by a single HAP.…”

Section: Introductionmentioning

confidence: 99%

Optimizing Concentric Circular Antenna Arrays for High-Altitude Platforms Wireless Sensor Networks

Albagory¹,

Said²

2014

IJCNIS

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Abstract-Wireless Sensor Networks (WSN) has gained interest in many applications and it becomes important to improve its performance. Antennas and communication performance are most important issues of WSN. In this paper, an adaptive concentric circular array (CCA) is proposed to improve the link between the sink and sensor nodes. This technique is applied to the new HighAltitude Platform (HAP) Wireless Sensor Network (WSN). The proposed array technique is applied for two coverage scenarios; a wider coverage cell of 30 km radius and a smaller cell of 8 km radius. The feasibility of the link is discussed where it shows the possibility of communications between the HAP sink station and sensor nodes located on the ground. The proposed CCA array is optimized using a modified Dolph-Chebyshev feeding function. A comparison with conventional antenna models in literature shows that the link performance in terms of bit energy to noise power spectral density ratio can be improved by up to 11.37 dB for cells of 8 km radius and 16.8 dB in the case of 30 km radius cells that make the link at 2.4 GHz feasible and realizable compared to using conventional antenna techniques.Index Terms-High altitude platforms, wireless sensor network, directional antennas, concentric circular arrays.

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The Role of High-Altitude Platforms (HAPs) in the Global Wireless Connectivity

Cited by 166 publications

References 39 publications

Sum-Rate Analysis for High Altitude Platform (HAP) Drones With Tethered Balloon Relay

Sum-Rate Analysis for High Altitude Platform (HAP) Drones With Tethered Balloon Relay

Stratospheric Winds and Rain Effect on HAPS Backhaul Link Performance

Optimizing Concentric Circular Antenna Arrays for High-Altitude Platforms Wireless Sensor Networks

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