Distributed Multiuser MIMO for LiFi in Industrial Wireless Applications

Bober, Kai Lennert; Mana, Sreelal Maravanchery; Hinrichs, Malte; Kouhini, Sepideh Mohammadi; Kottke, Christoph; Schulz, Dominic; Schmidt, Christian; Freund, Ronald; Jungnickel, Volker

doi:10.1109/jlt.2021.3069186

Cited by 31 publications

(15 citation statements)

References 61 publications

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“…In [25] it was demonstrated that, by using D-MIMO, the performance is improved and a higher data rate is achievable because the channel matrix is well-conditioned. In [5], [23], [26] and [27], a D-MIMO architecture for LiFi was investigated and its performance evaluated. It uses a coordinator, implemented as a central unit (CU) and multiple APs, also denoted as optical frontends (OFEs).…”

Section: Distributed Mimo For Lifimentioning

confidence: 99%

“…This approach can support a higher network capacity, as well as lower latency. Here mobility is supported by implementing MIMO algorithms at the lower physical and medium access layers in the protocol stack, whereas conventional mobile networks implement those at the transport and higher layers [5]. This advanced approach aims at new services in the future Industrial Internet-of-Things (IIoT), where wired communication links will be replaced by wireless connections that, however, interfere with each other.…”

Section: Introductionmentioning

confidence: 99%

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All-Optical Distributed MIMO for LiFi: Spatial Diversity Versus Spatial Multiplexing

et al. 2022

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LiFi or networked optical wireless communication is likely to play an important role in offloading mobile data traffic from radio into the optical spectrum. As the number of Internet of Things (IoT) devices is growing, the RF spectrum becomes a rare resource. Imaging IoT sensors like cameras, ultrasonic devices, and Lidars have real-time requirements, need a high-capacity uplink, and operate in environments that cause or are sensitive against electromagnetic interference. In this paper, for the first time, we present realtime communication over an all-optical fixed-wireless LiFi link based on the distributed multiple-input multiple-output concept. For distributing the wireless signals, plastic optical fibers are used as an analog front-haul. We study the operation of the distributed multiple-input multiple-output link in two modes, i.e., spatial diversity and spatial multiplexing. For the diversity mode, a new combiner is presented, which can support equal gain as well as selection combining. We demonstrate that selection combining is highly effective and enables a similar LiFi performance in up-and downlink, as it is desirable for industrial applications. For the spatial multiplexing mode, we observe that the channel rank and the achievable throughput depend strongly on the user location. As effective solutions, we study the benefits of angular diversity and multiple-input multiple-output mode switching together with multi-user multiplexing and conclude that a dynamic switching between spatial diversity and spatial multiplexing is a practical approach.

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Section: Distributed Mimo For Lifimentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

All-Optical Distributed MIMO for LiFi: Spatial Diversity Versus Spatial Multiplexing

et al. 2022

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“…Furthermore, the feasibility of using VLC systems in industrial production environments has been examined in literature [247], [248]. In [249], [250], the performance of VLC-based systems for multi-user MIMO architectures is investigated.…”

Section: B the Owc-iott In Smart Citiesmentioning

confidence: 99%

A Top-Down Survey on Optical Wireless Communications for the Internet of Things

Çelik¹,

Romdhane²,

Kaddoum³

et al. 2022

Preprint

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The Internet of Things (IoT) is a transformative technology marking the beginning of a new era where physical and digital worlds are integrated by connecting a plethora of uniquely identifiable smart objects. Although the Internet of terrestrial things (IoTT) has been at the center of our IoT perception, it has been recently extended to different environments, such as the Internet of underWater things (IoWT), the Internet of Biomedical things (IoBT), and Internet of underGround things (IoGT). Even though radio frequency (RF) based wireless networks are regarded as the default means of connectivity, they are not always the best option due to the limited spectrum, interference limitations caused by the ever-increasing number of devices, and severe propagation loss in transmission mediums other than air. As a remedy, optical wireless communication (OWC) technologies can complement, replace, or co-exist with audio and radio wave-based wireless systems to improve overall network performance. To this aim, this paper reveals the full potential of OWC-based IoT networks by providing a top-down survey of four main IoT domains: IoTT, IoBT, and IoGT. Each domain is covered by a dedicated and self-contained section that starts with a comparative analysis, explains how OWC can be hybridized with existing wireless technologies, points out potential OWC applications fitting best the related IoT domain, and discusses open communication and networking research problems. More importantly, instead of presenting a visionary OWC-IoT framework, the survey discloses that OWC-IoT has become a reality by emphasizing ongoing proof-of-concept prototyping efforts and available commercial off-the-shelf (COTS) OWC-IoT products.

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“…These techniques consider the many links between all base stations and all mobile users as one huge distributed MIMO which coordinated by a central controller. Note that this approach enables both, higher data rates and lower latency [27]. Here, we follow this approach in order to optimize the performance.…”

Section: Distributed Mu-mimo Conceptmentioning

confidence: 99%

Distributed Multiuser MIMO for LiFi: Experiments in an Operating Room

Mana

Jungnickel

Bober

et al. 2021

J. Lightwave Technol.

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Networked optical wireless communication, also denoted as LiFi, is expected to play an important role in so-called smart hospitals. In this paper, we present the first experimental study of LiFi in an operating room at Motol University Hospital in Prague, Czech Republic. First, we perform one-to-one measurements using an optical transmitter (Tx) and receiver (Rx) and observe that channels with a free LOS provide sufficient signal strength for mobile communication inside the operating room. Then we combine the individual LOS links into a multiple-input multiple-output (MIMO) link using four distributed transmitters representing a wireless infrastructure, and six distributed receivers representing medical devices. In this configuration, at least two strong singular values of the MIMO channel matrix are observed which allow spatial multiplexing. By appropriately clustering the transmitters and selecting the users, mobile devices can be served in parallel. For data transmission, several multiplexing schemes such as time-division multiple access (TDMA) with one and two best links, TDMA with spatial reuse, space-division multiple access (SDMA) with two best links with and without zero forcing (ZF) are considered. Results show that SDMA with ZF increases the data rate by 2.7 times compared to baseline TDMA, resulting in a total data rate of 600 Mbit/s.

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Distributed Multiuser MIMO for LiFi in Industrial Wireless Applications

Cited by 31 publications

References 61 publications

All-Optical Distributed MIMO for LiFi: Spatial Diversity Versus Spatial Multiplexing

All-Optical Distributed MIMO for LiFi: Spatial Diversity Versus Spatial Multiplexing

A Top-Down Survey on Optical Wireless Communications for the Internet of Things

Distributed Multiuser MIMO for LiFi: Experiments in an Operating Room

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