Site diversity for high-altitude platforms: a method for the prediction of joint site attenuation statistics

Konefal, T.; Spillard, C.; Grace, David

doi:10.1049/ip-map:20020107

Cited by 13 publications

(9 citation statements)

References 9 publications

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“…It should be mentioned that [10] deals with satellite networks; using the methodology presented in [5] and [11], [10] may easily be adapted to the HAP scenario. Correspondingly, the probability density function of the timer, f T (t), is transformed into where F T (t) is the cumulative distribution function of f T (t) after adopting the approximation RT T i = RT T .…”

Section: B22 Estimation Of Parameter Bmentioning

confidence: 99%

“…However, these approaches do not seem suitable for HAPNs, since the inherent characteristics of the specific wireless channel, especially fading due to atmospheric precipitation, are not taken into account. Specifically, HAPNs operate at 28/31GHz and 48/47GHz frequency bands [4]- [5], where propagation conditions, especially attenuation due to rain, significantly impair the link performance [6]. Hence, the assumption that during multicast transmissions the majority of packet losses originate from areas subjected to more intense rain fading is Manuscript valid.…”

Section: Introductionmentioning

confidence: 99%

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High altitude platform networks: A feedback suppression algorithm for reliable multicast/broadcast services

Αναστασόπουλος

Cottis

2009

IEEE Trans. Wireless Commun.

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High Altitude Platforms (HAP) are currently considered as an alternative solution for providing reliable multicast and broadcast services. The major problem limiting the scalability of such systems is Feedback Implosion, a problem arising whenever a large number of users transmit their feedback messages. In the present Letter, a novel scheme is proposed which takes into account rain attenuation being the dominant factor impairing link performance. The proposed scheme is based on the selection of an Area Representative (AR) which is responsible for providing quick feedback messages to the HAP, thus suppressing feedback messages sent by other users. The proposed scheme is assessed both through analytical modeling and simulation with very satisfactory results.Index Terms-Feedback suppression, reliable multicast/ broadcast, high altitude platforms.

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Section: B22 Estimation Of Parameter Bmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High altitude platform networks: A feedback suppression algorithm for reliable multicast/broadcast services

Αναστασόπουλος

Cottis

2009

IEEE Trans. Wireless Commun.

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“…In these frequency bands, line-of-sight paths are required and signals are strongly attenuated by rain [2], [3]. A possible solution is to use high-altitude platforms (HAPs), which are either airships or planes that will operate in the stratosphere, 17-22 km above the ground [4]- [12].…”

Section: Introductionmentioning

confidence: 99%

Improving the system capacity of broadband services using multiple high-altitude platforms

Grace

Thornton

Chen

et al. 2005

IEEE Trans. Wireless Commun.

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Article ReuseUnless indicated otherwise, fulltext items are protected by copyright with all rights reserved. The copyright exception in section 29 of the Copyright, Designs and Patents Act 1988 allows the making of a single copy solely for the purpose of non-commercial research or private study within the limits of fair dealing. The publisher or other rights-holder may allow further reproduction and re-use of this version -refer to the White Rose Research Online record for this item. Where records identify the publisher as the copyright holder, users can verify any specific terms of use on the publisher's website. TakedownIf you consider content in White Rose Research Online to be in breach of UK law, please notify us by emailing eprints@whiterose.ac.uk including the URL of the record and the reason for the withdrawal request.

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“…The high data rates demanded by broadband communications require a significant radio spectrum, so network designers are looking to utilise frequency allocations in the millimetre wave bands [1]. In these frequency bands line-of-sight paths are required and signals are strongly attenuated by rain [2,3].…”

Section: Introductionmentioning

confidence: 99%

Performance of Multiple High Altitude Platforms using Directive HAP and User Antennas

Chen

Grace

Tozer

2005

Wireless Pers Commun

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This paper examines the behaviour of system capacity in High Altitude Platform (HAP) communications systems as a function of antenna directivity and HAP positioning. Antenna models for the user and the HAP are discussed, and it is shown that a flat sidelobe antenna pattern is suitable for modelling multiple HAP constellations when HAPs are located outside the coverage area. Using a single HAP scenario it is shown how narrowing the HAP antenna beamwidth may give better downlink Carrier-to-Noise Ratio (CNR) over the most of the coverage area. The roles of the HAP antenna beamwidth, HAP antenna pointing and HAP spacing radius are investigated. An equation is derived to determine the location of the peak CNR combined with these three parameters. A more complex multiple HAP scenario where all HAP's operate on the same channel and interfere with each other is also assessed in terms of the Carrier to Interference plus Noise Ratio (CINR) and spectral efficiency. It is shown that locating HAPs at a specific spacing radius that is outside the coverage area can improve performance. Using these techniques the combined bandwidth efficiency is shown to increase almost pro-rata when the number of HAPs is increased up to 16.

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Site diversity for high-altitude platforms: a method for the prediction of joint site attenuation statistics

Cited by 13 publications

References 9 publications

High altitude platform networks: A feedback suppression algorithm for reliable multicast/broadcast services

High altitude platform networks: A feedback suppression algorithm for reliable multicast/broadcast services

Improving the system capacity of broadband services using multiple high-altitude platforms

Performance of Multiple High Altitude Platforms using Directive HAP and User Antennas

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