Effective auto-alignment and tracking of transceivers for visible-light communication in data centres

Liu, Fulin; Chen, Minan; Jiang, Wenming; Jin, Xianqing; Xu, Zhengyuan

doi:10.1117/12.2506955

Cited by 6 publications

(4 citation statements)

References 12 publications

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“…Since we only focus on the communication part in this work, we assume the position information is available to the terminal and can be fed back to the transmitter. Benefiting from the position information, the transmitting and receiving antennas are generally considered to be aligned [7], [11], which can also be realized by tracking schemes [29], [30]. According to the characteristics of the LG beam, the receiver may lie outside the beam, as shown in the lower right part of Figure 1.…”

Section: System Modelmentioning

confidence: 99%

Map-Assisted Constellation Design for mmWave WDM With OAM in Short-Range LOS Environment

Wang

Gong

Huang

et al. 2023

IEEE Open J. Commun. Soc.

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We consider a system that integrates positioning and single-user millimeter wave (mmWave) communication, where the communication part adopts wavelength division multiplexing (WDM) and orbital angular momentum (OAM). This paper addresses the multi-dimensional constellation design in short-range line-of-sight (LOS) environment, with stable communication links. We propose a map-assisted method to quantify the system parameters based on positions and reduce real-time computing overhead. We explore the possibility of using a few patterns in the maps, and investigate its performance loss. We first investigate the features of OAM beams, and find that the link gain ratio between any two sub-channels remains unchanged at some specific positions. Then, we prove that a fixed constellation can be adopted for the positions where the link gain matrices are sufficiently close to be proportional. Moreover, we prove that the system can adopt a fixed power vector to generate a multi-dimensional constellation if the difference between fixed power vector and optimal power vector is small. Finally, we figure out that the constellation design for all receiver positions can be represented by a few constellation sets.INDEX TERMS Millimeter wave communication, multi-dimensional constellation, orbital angular momentum, wavelength division multiplexing, short-range line-of-sight.

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Section: System Modelmentioning

confidence: 99%

Map-Assisted Constellation Design for mmWave WDM With OAM in Short-Range LOS Environment

Wang

Gong

Huang

et al. 2023

IEEE Open J. Commun. Soc.

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“…Beneficial from the position information, the transmitting and receiving antennas are generally considered to be aligned [8], [13], which can also be realized by tracking schemes [35], [36]. However, the receiver may lie outside the LG beam, which is shown in Figure 1.…”

Section: System Modelmentioning

confidence: 99%

Map-Assisted Constellation Design for mmWave WDM with OAM in Short-Range LOS Environment

Wang¹,

Chen²,

Huang³

et al. 2021

Preprint

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Consider a system that integrates positioning and single-user millimeter wave (mmWave) communication, where the communication part adopts wavelength division multiplexing (WDM) and orbital angular momentum (OAM). This paper addresses the power allocation and high dimensional constellation design in short-range line-of-sight (LOS) environment, with stable communication links. We propose a mapassisted method to reduce transmission delay and online computing overhead. We explore the possibility of using a few patterns in the maps, and investigate its performance loss. For power allocation, we first characterize the performance loss outside the OAM beam regions with only plane waves, and figure out that the loss is always small. However, in OAM beam regions, the performance loss has similar characteristics only at some specific positions. Based on numerical results, we illustrate that a few patterns can be adopted for all receiver locations in the map. We also investigate high dimensional constellation design, and prove that a fixed constellation can be adopted for the positions where the channel matrices are sufficiently close to be proportional. Similarly, we figure out that the constellation design for all receiver locations can be represented by a few constellation sets.

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“…The RSSI-based APT system employs an optical sensor to detect signal strength and utilizes three anchors to determine its position through standard trilateration. In 2016, an efficient transceiver auto-alignment and tracking scheme has been proposed for practical VLC and laser-based free-space optical communication (FSO) systems [16]. This scheme utilizes a transceiver that is developed based on field-programmable gate array (FPGA), and combines auto-alignment and tracking functionalities.…”

Section: Introductionmentioning

confidence: 99%

Experimental Demostration of a MIMO-OFDM Underwater Optical Communication System for Reducing Alignment Angle Requirements

Li,

Fu,

Sun

et al. 2024

IEEE Photonics J.

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Although the underwater optical communication system (UWOC) plays an important role in many marine applications, the acquisition, pointing and tracking (APT) problem are still great challenge in a long or turbid water channel. The Orthogonal Frequency Division Multiplexing (OFDM) and the space-time block coding (STBC) technologies have been introduced in UWOC systems to improve spectral efficiency and data transmission reliability. On these foundations, a multi-input multi-output (MIMO) mode is proposed and verified in this paper to reduce the alignment requirement. In experiments, two sets of 450nm blue laser diodes (LDs) and PIN photodiodes are selected as light sources and receivers, and then parallel light beams are generated and modulated using an Alamouti coding for its anti-interference ability. The receiving plane is rotated to simulate the various alignment situations, and the system performance of MIMO-OFDM and single-input single-output OFDM (SISO-OFDM) are compared in tap water and turbid water. The results show that the spatial diversity in MIMO can extend the communication range and its single-sided maximum detection angle range is 92% and 112% higher than the SISO system, respectively.

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Effective auto-alignment and tracking of transceivers for visible-light communication in data centres

Cited by 6 publications

References 12 publications

Map-Assisted Constellation Design for mmWave WDM With OAM in Short-Range LOS Environment

Map-Assisted Constellation Design for mmWave WDM With OAM in Short-Range LOS Environment

Map-Assisted Constellation Design for mmWave WDM with OAM in Short-Range LOS Environment

Experimental Demostration of a MIMO-OFDM Underwater Optical Communication System for Reducing Alignment Angle Requirements

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