A novel centralized beamforming scheme for radio-over-fiber systems with fixed wavelength allocation

Ito, Kota; Suga, Mizuki; Shirato, Yushi; Kita, Naoki; Onizawa, Takeshi

doi:10.1587/comex.2019gcl0043

Cited by 9 publications

(3 citation statements)

References 6 publications

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“…IRS can be used to provide large beamforming gains for these devices. The IRS and the BS will be fixed in place and probably with limited surrounding scatterers, which simplifies the centralized beamforming optimization between the IRS and the BS.Compared with traditional beamforming methods that control wavelength allocation, centralized beamforming provides higher wavelength utilization efficiency and can control the beam direction without explicit control of the BS [25].…”

Section: A Centralized Beamforming For Iot Devicesmentioning

confidence: 99%

A Study on IRS-assisted Communications: Problems, Challenges, and Solutions

Liu¹,

Mei²

2022

J-NaNA

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This paper studies the Intelligent reflecting surface (IRS)-based communications, including the fixed and UAV-mounted IRSs. IRSs can be deployed in locations that are difficult to receive or transmit signals due to obstacles or remote areas by passively reflecting the signals received from base stations (BSs). The IRSs can reflect signals in the designed way to enhance the transmitted signal or enable line-of-sight (LOS) communications. They can be fixed on the side of high buildings to reflect signals or mounted on the UAVs to provide temporary wireless communications in the remote areas. This paper conducts an overview on IRS-based communications including the existing problems, challenges, and possible solutions.

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Section: A Centralized Beamforming For Iot Devicesmentioning

confidence: 99%

A Study on IRS-assisted Communications: Problems, Challenges, and Solutions

Liu¹,

Mei²

2022

J-NaNA

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“…When functions are separated and base stations are simplified by applying analog RoF, the problem of how to carry out beamforming at base stations that do not have signal-processing units arises. Therefore, we previously proposed and have been investigating a technology called remote beamforming that can remotely control the beam formed at the base station from the central station [1,2]. Our remote-beamforming technology is explained with the example of using a receiver in Fig.…”

Section: Feature Articlesmentioning

confidence: 99%

Efficiently Accommodating High-frequency-band Wireless Systems by Using Analog Radio-over-fiber

Ito

Suga

Shirato

et al. 2020

NTT Technical Review

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Large-capacity wireless transmission is possible with high-frequency-band wireless systems, but it is necessary to deploy wireless base stations at high density. Under the assumption that the number of wireless systems will increase to meet diversifying needs, the number of wireless base stations to be installed is expected to increase dramatically. At NTT Access Network Service Systems Laboratories, we propose a system configuration that uses analog radio-over-fiber (RoF) technology to enable multiple high-frequency-band wireless systems to share wireless equipment for drastically reducing the number of wireless base stations and their operating loads. This system configuration and its fundamental technology, namely, our remote-beamforming technology, are introduced in this article.

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“…To enable beamforming with simplified remote radio units that have no signal processing unit, it is necessary to remotely control beamforming by the central station. Therefore, we also previously proposed two remote beamforming schemes that enable the central station to remotely control beamforming by remote radio units [3,4].…”

Section: Introductionmentioning

confidence: 99%

Wireless Technology for Extreme NaaS—Remote Beamforming Schemes for Analog Radio-over-fiber-based High-frequency-band Wireless Communication Systems

Suga

Ito

Arai

et al. 2021

NTT Technical Review

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As one of the wireless communication technologies for extreme NaaS (network as a service), NTT Access Network Service Systems Laboratories previously proposed a system configuration to effectively expand the coverage area of high-frequency-band wireless systems. This configuration can separate the functions of a wireless base station and simplify remote radio units by using the analog radioover-fiber technique. High-frequency-band wireless systems require beamforming to improve receiving sensitivity. This article describes remote beamforming schemes to enable beamforming with simplified remote radio units.

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A novel centralized beamforming scheme for radio-over-fiber systems with fixed wavelength allocation

Cited by 9 publications

References 6 publications

A Study on IRS-assisted Communications: Problems, Challenges, and Solutions

A Study on IRS-assisted Communications: Problems, Challenges, and Solutions

Efficiently Accommodating High-frequency-band Wireless Systems by Using Analog Radio-over-fiber

Wireless Technology for Extreme NaaS—Remote Beamforming Schemes for Analog Radio-over-fiber-based High-frequency-band Wireless Communication Systems

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