A Physical Layer for Low Power Optical Wireless Communications

Hinrichs, Malte; Berenguer, Pablo Wilke; Hilt, J. Zach; Hellwig, Peter; Schulz, Dominic; Paraskevopoulos, A.; Bober, Kai Lennert; Freund, Ronald; Jungnickel, Volker

doi:10.1109/tgcn.2020.3038692

Cited by 15 publications

(6 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Both are chosen such that they support the different requirements for downlink and uplink in an optimal way. Because MUs may be battery-powered, the uplink PHY should be more energy-efficient and able to operate at a low signal-to-noise ratio (SNR) [16].…”

Section: Lifi Conceptmentioning

confidence: 99%

ELIoT: enhancing LiFi for next-generation Internet of things

Linnartz

Corrêa

Cunha

et al. 2022

J Wireless Com Network

View full text Add to dashboard Cite

Communication for the Internet of things (IoT) currently is predominantly narrowband and cannot always guarantee low latency and high reliability. Future IoT applications such as flexible manufacturing, augmented reality and self-driving vehicles rely on sophisticated real-time processing in the cloud to which mobile IoT devices are connected. High-capacity links that meet the requirements of the upcoming 6G systems cannot easily be provided by the current radio-based communication infrastructure. Light communication, which is also denoted as LiFi, offers huge amounts of spectrum, extra security and low-latency transmission free of interference even in dense reuse settings. We present the current state-of-the-art of LiFi systems and introduce new features needed for future IoT applications. We discuss results from a distributed multiple-input multiple-output topology with a fronthaul using plastic optical fibre. We evaluate seamless mobility between the light access points and also handovers to 5G, besides low-power transmission and integrated positioning. Future LiFi development, implementation and efforts towards standardization are addressed in the EU ELIoT project which is presented here.

show abstract

Section: Lifi Conceptmentioning

confidence: 99%

ELIoT: enhancing LiFi for next-generation Internet of things

Linnartz

Corrêa

Cunha

et al. 2022

J Wireless Com Network

View full text Add to dashboard Cite

show abstract

“…Energy efficiency can be an issue since the mobile units generally work on battery. The use of powerefficient modulation, such as On-Off Keying with frequencydomain equalization (OOK-FDE) [19] is promising. In the rest, we will describe some well-known positioning techniques using LiFi and some related works.…”

Section: Lifi-based Positioningmentioning

confidence: 99%

LiFi Positioning for Industry 4.0

Kouhini

Kottke

et al. 2021

IEEE J. Select. Topics Quantum Electron.

Self Cite

View full text Add to dashboard Cite

Precise position information is considered as the main enabler for the implementation of smart manufacturing systems in Industry 4.0. In this article, a time-of-flight based indoor positioning system for LiFi is presented based on the ITU -T recommendation G.9991. Our objective is to realize positioning by reusing already existing functions of the LiFi communication protocol which has been adopted by several vendors. Our positioning algorithm is based on a coarse timing measurement using the frame synchronization preamble, similar to the ranging, and a fine timing measurement using the channel estimation preamble. This approach works in various environments and it requires neither knowledge about the beam characteristics of transmitters and receivers nor the use of fingerprinting. The new algorithm is validated through both, simulations and experiments. Results in an 1m × 1m × 2m area indicate that G.9991-based positioning can reach an average distance error of a few centimeters in three dimension. Considering the common use of lighting in indoor environments and the availability of a mature optical wireless communication system using G.9991, the proposed LiFi positioning is a promising new feature that can be added to the existing protocols and enhance the capabilities of smart lighting systems further for the benefit of Industry 4.0.

show abstract

“…In contrast to OFDM, the peak-to-average power ratio of OOK is one, increasing the average output power under peak-power limitations. Moreover, the amplifier in the LED driver can be operated in a switching mode, saving a significant amount of the power in the OFE [63]. Since the spectral efficiency is low, a higher bandwidth compared with OFDM-based systems is needed to achieve a given throughput.…”

Section: B Low Power Phymentioning

confidence: 99%

“…Fig.10. Simulated success rates for the synchronization preamble, header and payload parts of the OOK PHY frame[63].…”

mentioning

confidence: 99%

Distributed Multiuser MIMO for LiFi in Industrial Wireless Applications

Bober

Mana

Hinrichs

et al. 2021

J. Lightwave Technol.

Self Cite

View full text Add to dashboard Cite

We present a concept for networked optical wireless communications, also denoted as LiFi, to meet the requirements of industrial wireless applications. These are primarily mobility support with moderate data rates per device, reliable real-time communication and integrated positioning. We describe a distributed multiuser multiple-input multiple-output architecture, serving mobile devices via an optical wireless infrastructure. The system consists of a central unit, being connected to a number of distributed optical frontends covering a larger area. Our main contribution is a medium access control protocol based on spacedivision multiple access. Evaluation results demonstrate the advantages of joint transmission from adjacent optical frontends and the dynamic switching between spatial diversity and multiplexing. The relevance of spatial multiplexing becomes obvious in channel measurements in an indoor scenario. Moreover, we highlight a low-power physical layer based on onoff-keying for battery-powered mobile devices. Our architecture can easily integrate positioning by simultaneously measuring the time-of-flight between multiple optical frontends and the mobile device. We highlight the use of plastic optical fiber as an analog fronthaul technology and discuss the integration with other networks. The main functions described in this paper will be supported by the upcoming IEEE Std. 802.15.13.

show abstract

A Physical Layer for Low Power Optical Wireless Communications

Cited by 15 publications

References 27 publications

ELIoT: enhancing LiFi for next-generation Internet of things

ELIoT: enhancing LiFi for next-generation Internet of things

LiFi Positioning for Industry 4.0

Distributed Multiuser MIMO for LiFi in Industrial Wireless Applications

Contact Info

Product

Resources

About