A Study on Antenna Beamforming Method Considering Movement of Solar Plane in HAPS System

Hoshino, Kenji; Sudo, S.; Ohta, Yoshichika

doi:10.1109/vtcfall.2019.8891546

Cited by 53 publications

(18 citation statements)

References 7 publications

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“…Variations in movement can lead to many handovers, which increase unnecessary control signals and degrade communications quality. A beamforming technique and a necessary antenna configuration that fixes cell locations regardless of UAV movement were studied to avoid this issue [4]. Such research showed that beamforming can control beam direction to offset UAV movement; thus, cell location remains the same regardless of the UAV's position.…”

Section: Basic Concept Of Haps Systemmentioning

confidence: 99%

“…HAPS mobile communications use unmanned aerial vehicles (UAVs), such as balloons, airships, and other aircraft, that fly in the stratosphere at an altitude of 20 km, where low wind speeds are expected. Although HAPSs are mainly expected to provide fixed communications infrastructure for Internet backhaul, they also have potential for mobile communications that use the same systems as those of terrestrial networks, such as fourth generation Long Term Evolution (4G LTE) and fifth generation New Radio (5G NR) [2][3][4][5]. Because the altitude of HAPSs is significantly lower than that of communications satellites, e.g., 36,000 km for stationary satellites, a HAPS can provide mobile communications services directly to smartphones, which are commonly used in terrestrial mobile communications networks with 4G LTE and, eventually 5G NR.…”

Section: Introductionmentioning

confidence: 99%

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System Design of Gigabit HAPS Mobile Communications

et al. 2020

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High-altitude platform stations (HAPSs) are expected to provide ultrawide-coverage areas and disaster-resilient networks from the stratosphere at around 20 km by installing wireless equipment on HAPS. Because their altitude is much lower than that of communications satellites, HAPSs can provide mobile communications services directly to smartphones, which are commonly used in terrestrial networks, such as fourth generation Long Term Evolution. Considering the widespread nature of mobile broadband communications and the importance as a backup line in case of disaster, HAPSs are expected to provide a large capacity in the future. A cellular system with single-cell frequency reuse using multiple cells similar to terrestrial mobile communications should be introduced to achieve such a capacity. The number of cells that a HAPS can accommodate ranges from 1 to more than 100, depending on unmanned aerial vehicle (UAV) ability. By contrast, the optimal cell configuration, which depends on the number of available cells, has not been clarified in previous research. In this paper, we propose an optimization method for the cell configuration for HAPS mobile communications using a genetic algorithm, which can be generally applied regardless of the number of cells and can clarify the optimal cell configuration. Although many cells are required to achieve gigabit-class HAPS mobile communications, the heightened power consumption due to the large number of cells is a critical problem for UAVs. Thus, we also investigate the reduction of the total transmission power and demonstrate the feasibility of energy-efficient gigabit HAPS mobile communications with wide coverage.

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Section: Basic Concept Of Haps Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

System Design of Gigabit HAPS Mobile Communications

et al. 2020

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“…Recently, displaced antenna arrays (DAAs) [20], L-shaped array, V-shaped array, hexagonal arrays have been proposed for smart antenna beamforming. However, all these types can provide the 2-D signal estimation and are applicable in specific applications.…”

Section: Introductionmentioning

confidence: 99%

Improved Adaptive Beamforming for Smart Antennas

Dakulagi

Yeap

et al. 2021

Preprint

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In this paper, we propose a new antenna array configuration for smart antenna beamforming. In this new method, we displace two antenna elements of a uniform linear array (ULA) and place them at the top and bottom of the array axis. We investigate the efficacy of this method by deploying the variable step size least mean square algorithm (VSSLMS). The proposed method is compared with popular LMS and normalized LMS algorithms. Computer simulations show that the proposed method has enhanced convergence rate and high data transmission compared to the LMS and the NLMS methods. Also, the new method has the same performance for middle angles, near boresight and array endfires which is not possible for the LMS and the NLMS method using a ULA.

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“…M. Guan et al [7] estimate the downlink capacity of HAPS-CDMA system considering the relationship between beam coverage and spectral efficiency. HAPS could only be sustained in a quasi-static state because of the stratospheric wind [8], K. Hoshino et al [9] believe that the HAPS in the vertical direction has greater side effect on the system capacity and larger cell soft handover than the displacement in the horizontal direction. The influence of HAPS displacement on the performance of the system under two separated antenna mechanisms is discussed in [10].…”

Section: Introductionmentioning

confidence: 99%

An Efficient Markov Chain Based Channel Model for 6G Enabled Massive Internet of Things

2021

KSII TIIS

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Accelerated by the Internet of Things (IoT), the need for further technical innovations and developments within wireless communications beyond the fifth generation (B5G) networks is up-and-coming in the past few years. High altitude platform station (HAPS) communication is expected to achieve such high levels that, with high data transfer rates and low latency, millions of devices and applications can work seamlessly. The HAPS has emerged as an indispensable component of next-generations of wireless networks, which will therefore play an important role in promoting massive IoT interconnectivity with 6G. The performance of communication and key technology mainly depend on the characteristic of channel, thus we propose an efficient Markov chain based channel model, then analyze the HAPS communication system's uplink capability and swing effect through experiments. According to the simulation results, the efficacy of the proposed scheme is proven to meet the requirements of ubiquitous connectivity in future IoT enabled by 6G.

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A Study on Antenna Beamforming Method Considering Movement of Solar Plane in HAPS System

Cited by 53 publications

References 7 publications

System Design of Gigabit HAPS Mobile Communications

System Design of Gigabit HAPS Mobile Communications

Improved Adaptive Beamforming for Smart Antennas

An Efficient Markov Chain Based Channel Model for 6G Enabled Massive Internet of Things

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