The capacity analysis on a HAPS-CDMA system based on the platform displacement model

Qi, Zhaoqun; Jing, Xiaojun; You, Siqing

doi:10.1109/icnidc.2010.5657922

Cited by 6 publications

(5 citation statements)

References 3 publications

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“…Similarly, an insufficient number of studies [16][17][18][19][20] have been carried out on the capacity of HAP systems. Hong et al [16] investigated the capacity of HAP wideband code division multiple access systems with respect to the number of users that can be supported on the forward and reverse links of the HAP.…”

Section: Literature Reviewmentioning

confidence: 99%

“…They derive capacity based on the number of users supportable by the HAP links and show that a HAP cell can support more users than a terrestrial base station. The effect of platform displacement on HAPs, which shows that horizontal displacement affects capacity significantly more than vertical displacement, was presented in [18]. Huang et al [17] studied the uplink capacity of an integrated HAP-Terrestrial system where low-mobility users connect to the terrestrial base station while high-mobility users connect to the HAP.…”

Section: Literature Reviewmentioning

confidence: 99%

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Delivering Extended Cellular Coverage and Capacity Using High-Altitude Platforms

2022

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Interest in delivering cellular communication using a high-altitude platform (HAP) is increasing partly due to its wide coverage capability. In this paper, we formulate analytical expressions for estimating the area of a HAP beam footprint, average per-user capacity per cell, average spectral efficiency (SE) and average area spectral efficiency (ASE), which are relevant for radio network planning, especially within the context of HAP extended contiguous cellular coverage and capacity. To understand the practical implications, we propose an enhanced and validated recursive HAP antenna beam-pointing algorithm, which forms HAP cells over an extended service area while considering beam broadening and the degree of overlap between neighbouring beams. The performance of the extended contiguous cellular structure resulting from the algorithm is compared with other alternative schemes using the carrier-to-noise ratio (CNR) and carrier-to-interference-plus-noise ratio (CINR). Results show that there is a steep reduction in average ASE at the edge of coverage. The achievable coverage is limited by the minimum acceptable average ASE at the edge, among other factors. In addition, the results highlight that efficient beam management can be achieved using the enhanced and validated algorithm, which significantly improves user CNR, CINR, and coverage area compared with other benchmark schemes. A simulated annealing comparison verifies that such an algorithm is close to optimal.

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Section: Literature Reviewmentioning

confidence: 99%

Section: Literature Reviewmentioning

confidence: 99%

Delivering Extended Cellular Coverage and Capacity Using High-Altitude Platforms

2022

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“…Sequence. In a CDMA system using short spreading sequence communication, if multiple users are located at similar address codes, interference between multiple users can not be avoided, which will affect the quality of information transmission of the entire system [18,20]. Suppose the number of users is k, and the users interact with each other in the multibeam satellite communication system.…”

Section: Collision Probability Of the System With Short Spreadingmentioning

confidence: 99%

User Capacity Analysis of Space-Based Internet of Things with Multibeam Techniques

Zhang

Sun

Hou

et al. 2022

Wireless Communications and Mobile Computing

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Space-based Internet of Things (S-IoT) utilizes the characteristics of satellite network coverage, strong antidestructiveness, and full-time work to realize large-scale sensing and interconnection of everything in the sky, land, sea, and air. The user capacity of S-IoT satellites is mainly determined by beam design, communication schemes, satellite-to-earth links, and communication protocols, which directly affect the system capacity and operational capabilities of S-IoT. This paper proposes an S-IoT satellite user capacity analysis model with multibeam and spread spectrum technology. Taking into account the randomness of user distribution, the difference in transmit power, and different spreading sequences, the user capacity of S-IoT satellites was simulated and compared in different scenarios. Based on these results, this article analyzes the key factors affecting user capacity, which will provide a valuable reference for S-IoT design, link optimization, and power selection.

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“…Another important issue is the amount of external energy required to obtain the desired airship trajectory. For example, paper [28] proposes high-altitude platforms utilizing solar cells as novel radio transmission systems, while paper [29] introduces application of HAPS as a platform for providing third generation (3G) mobile services. Both the above-mentioned platforms are expected to be relatively stable or follow the desired trajectory over a long period of time.…”

Section: Introductionmentioning

confidence: 99%

Bulletin of the Polish Academy of Sciences: Technical Sciences

Knap¹,

Graczykowski²,

Holnicki‐Szulc³

et al. 2020

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In this article, the authors propose and investigate a new concept of HAPS aerostat design in a modular form, which allows for sequential increasing or decreasing of the total volume, up to the desired size. In its initial form, the aerostat has relatively small dimensions but its central cylindrical part is multi-segmented and can be easily extended. The application of controllable construction couplings enables precise control of the aerostat expansion process and significantly improves its vertical mobility. The paper describes details of telescopic aerostat construction, presents a mathematical model of its vertical motion and investigates numerically two volume control strategies aimed at maximization of operation efficiency and minimization of operation cost. The results obtained reveal the main problems that have to be addressed and the factors that play a key role in design of such telescopic aerostats and control of their vertical mobility.

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The capacity analysis on a HAPS-CDMA system based on the platform displacement model

Cited by 6 publications

References 3 publications

Delivering Extended Cellular Coverage and Capacity Using High-Altitude Platforms

Delivering Extended Cellular Coverage and Capacity Using High-Altitude Platforms

User Capacity Analysis of Space-Based Internet of Things with Multibeam Techniques

Bulletin of the Polish Academy of Sciences: Technical Sciences

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