Nullforming-Based Precoder for Spectrum Sharing Between HAPS and Terrestrial Mobile Networks

Tashiro, Koji; Hoshino, Kenji; Nagate, Atsushi

doi:10.1109/access.2022.3176871

Cited by 16 publications

(12 citation statements)

References 29 publications

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“…Because the HAPS remains in the stratosphere at an altitude of approximately 20 km, the direct path along its line of sight (LOS) is dominant. Therefore, we can simply model the channel vector between the HAPS and the user associated with terrestrial BS 𝑏 as follows [6,7]:…”

Section: System Modelmentioning

confidence: 99%

Spectrum Sharing in Integrated HAPS and Terrestrial Systems Using an Interference Canceler and Coordination

Ishikawa,

Tashiro,

Konishi

et al. 2024

IEICE Commun. Express

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High-altitude platform stations (HAPSs) have the potential to expand the coverage of sixth-generation mobile communication systems, and several international mobile telecommunications (IMT) bands below 2.7 GHz have already been identified for HAPS service links. Because of the limited frequency resources, spectrum sharing techniques are needed to ensure that HAPSs can coexist with terrestrial base stations (BSs), but this means that a HAPS may interfere with the connection of terrestrial BS users within its line of sight. This letter proposes a scheme that combines an interference canceler and enhanced inter-cell interference coordination to reduce interference in an integrated HAPS-terrestrial system. Numerical simulations demonstrated that the integrated system greatly improved the signal-to-interference-plus-noise ratio of terrestrial BSs and improved the system capacity by 26% compared to a conventional system with no interference reduction.

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Section: System Modelmentioning

confidence: 99%

Spectrum Sharing in Integrated HAPS and Terrestrial Systems Using an Interference Canceler and Coordination

Ishikawa,

Tashiro,

Konishi

et al. 2024

IEICE Commun. Express

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“…Together, they can provide global high-capacity coverage using a single system. There are many challenges related to efficient radio resource management (RMM) and multi-band connectivity through the dynamic use of FSO, mmWave, and THz technologies [14]. What is required are decentralized algorithms that converge rapidly and that can be implemented on general-purpose units (GPUs).…”

Section: B Haps Integration With Satellite and Terrestrial Networkmentioning

confidence: 99%

HAPS for 6G Networks: Potential Use Cases, Open Challenges, and Possible Solutions

Abbasi¹,

Yadav²,

Yanıkömeroğlu³

et al. 2023

Preprint

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High altitude platform station (HAPS), which is deployed in the stratosphere at an altitude of 20-50 kilometres, has attracted much attention in recent years due to their large footprint, line-of-sight links, and fixed position relative to the Earth. Compared with existing network infrastructure, HAPS has a much larger coverage area than terrestrial base stations and is much closer than satellites to the ground users. Besides smallcells and macro-cells, a HAPS can offer one mega-cell, which can complement legacy networks in 6G and beyond wireless systems. This paper explores potential use cases and discusses relevant open challenges of integrating HAPS into legacy networks, while also suggesting some solutions to these challenges. The cumulative density functions of spectral efficiency of the integrated network and cell-edge users are studied and compared with terrestrial network. The results show the capacity gains achieved by the integrated network are beneficial to cell-edge users. Furthermore, the advantages of a HAPS for backhauling aerial base stations are demonstrated by the simulation results.

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“…In [13], a machine learning based channel estimation approach was arXiv:2307.12799v1 [eess.SY] 24 Jul 2023 developed to overcome the outdated channel state information, based on which a beamforming compensation algorithm was designed to reduce the interference. In [14], a precoding scheme was proposed for the high-altitude platform stations and terrestrial BSs coexisted network, which can generate high-gain beams in the direction of users and nulls in the direction of terrestrial BSs. More relevant papers are surveyed in [10].…”

Section: B Motivation and Related Workmentioning

confidence: 99%

The School of History and the Institute for Global History, Beijing Foreign Studies University

Wang¹

2021

Journal of Cultural Interaction in East Asia

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The School of History and the Institute for Global History of Beijing Foreign Studies University was founded in December 2017. It aims to become a significant platform in China for international scholars to conduct research on global history. The school offers course on the histories of China and regions across the world from a global perspective. In terms of research, it is the school’s goal to understand history through interactions, especially the interaction between China and the world in modern terms. The school pays special attention to the fields of the history of ideas, the knowledge transfer and scholarly exchange, and the cultural and linguistic contact between the East and the West.

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Nullforming-Based Precoder for Spectrum Sharing Between HAPS and Terrestrial Mobile Networks

Abstract: Part of this work was conducted under the grant, "R&D on efficient spectrum use technologies for wireless communications systems using HAPS (JPJ000254)," funded by the Ministry of Internal Affairs and Communications of Japan.

Cited by 16 publications

References 29 publications

Spectrum Sharing in Integrated HAPS and Terrestrial Systems Using an Interference Canceler and Coordination

Spectrum Sharing in Integrated HAPS and Terrestrial Systems Using an Interference Canceler and Coordination

HAPS for 6G Networks: Potential Use Cases, Open Challenges, and Possible Solutions

The School of History and the Institute for Global History, Beijing Foreign Studies University

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