Tracking System for Fast Moving Nodes in Optical Mobile Communication and the Design Rules

Zhang, Kehan; Zhu, Bingcheng; Zhang, Zaichen; Wang, Haibo

doi:10.1109/twc.2020.3044093

Cited by 8 publications

(5 citation statements)

References 24 publications

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“…This was achieved by deriving the expressions of probability density function (PDF) and cumulative distribution function (CDF) under different channel fading models, such as K distribution [12,13], Log-Normal distribution [14,15], Γ − Γ distribution [16][17][18][19], and generalized Málaga distribution [20,21], etc. The results demonstrate a strong dependence of performance indices on adjustable system parameters, such as beam divergence angle, transmitted optical power, and receiver's FOV angle [14,[21][22][23]. Additionally, the OBDA varies with different factors, such as transmitted optical power [14,21,[24][25][26][27].…”

Section: Introductionmentioning

confidence: 90%

A Review of Variable-Beam Divergence Angle FSO Communication Systems

Zhang

et al. 2023

Photonics

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Free-space optical (FSO) communication is widely used in satellites, ships, aircraft, and ground stations due to its advantages of high speed, large capacity, good confidentiality, and strong anti-interference ability. Variable-beam divergence angle (VBDA) technology makes FSO systems more flexible; this has the benefits of higher acquisition probability, stronger tracking ability, wider communication link range, and lower energy consumption. In other words, the study of VBDA has both theoretical significance and practical relevance. This paper conducts a comprehensive search of relevant scientific databases, journals, conference proceedings, patents, and books to identify publications related to VBDA technology. We analyze these publications, classify and organize various VBDA techniques based on their respective methods. To the best of our knowledge, this is the first review of VBDA technology. In this paper, we first explain the basic principle of changing the beam divergence angle by employing the ABCD matrix, and further furnish a detailed overview of the methods used for VBDA along with their corresponding advantages and disadvantages. In addition, we provide a comprehensive summary of the research conducted using VBDA technology across different link types. Lastly, we identify the challenges and potential future research directions for VBDA technology.

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Section: Introductionmentioning

confidence: 90%

A Review of Variable-Beam Divergence Angle FSO Communication Systems

Zhang

et al. 2023

Photonics

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“…In contrast, VLC systems employ illumination LEDs whose viewing angles are generally above 90 • , making the ATP process unnecessary. OMC channels are also different from the FSO channels because the turbulence-induced fading in FSO systems is negligible in OMC systems as the links are shorter [15]. Besides, the causes of the pointing error in FSO systems are mainly transceiver sway and platform vibration, while those of the OMC systems are the positioning error and the imperfection of the steering units.…”

Section: Available Channel Models and Open Problemsmentioning

confidence: 99%

“…This makes their stochastic model different. Despite of all the differences, it is still valid to exploit the intensity distribution of the Gaussian beams in FSO channels [4], and the relation between received power and the incident light direction in VLC channels [15].…”

Section: Available Channel Models and Open Problemsmentioning

confidence: 99%

Optical Mobile Communications: Architecture and Enabling Technologies

Zhu¹

2023

Preprint

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<p>Modern mobile communication systems exploit complicated modulations to increase spectrum efficiency and larger antenna arrays to suppress co-channel interferences. However, these techniques have also caused surges of power consumption and hardware cost, making it unsustainable to squeeze gains from the radio-frequency electronics. To circumvent the dilemma, optical mobile communication (OMC) systems exploit wideband lasers to carry data, and do not necessarily involve high-order modulation and oversized arrays. In OMC systems, parallel laser beams can achieve data rate of Tbps, connection density of thousands of links/m$^2$, and energy efficiency of Gbits/J, with low cost and low signal processing complexity, as long as the challenges in receiver tracking, channel decorrelation and anti-blocking can be tackled. To this end, this work presents a new OMC system architecture and discusses enabling technologies of practical OMC systems. A prototype is built to verify the feasibility of several key concepts. It is shown that a practical OMC system requires collaboration of fast and accurate positioning systems, rapid laser steerers, optical reflective intelligent surfaces and decorrelation optics.</p>

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“…Based on the above mathematical principle, the aim of this paper is to analyze the potential performance of OMC and compare it with existing schemes. Implementation issues, including the beam adaptation schemes and demo, positioning and coherent transmitting and receiving techniques, and their feasibilities, can be found in [19,29,30]. Improved or new implementations will be developed in future works.…”

Section: System Model With a Single Light Sourcementioning

confidence: 99%

Performance of Optical Mobile Communications with User Mobility and Multiple Light Sources

Dang

Gao

Zhang

et al. 2021

Wireless Communications and Mobile Computing

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Optical mobile communication (OMC) is a recently proposed optical wireless communication concept aiming to provide very high-speed data rate optical wireless links for multiple and, in general, distributed mobile users. Previous work analyzed the rate performance of a two-user OMC system without user mobility. This paper extends the rate analysis to multiple users with mobility. The scenario of employing multiple light sources with possible user grouping is also considered. User mobility and multiple light sources lead to new challenges on the system design which are addressed for broadcast downlink communication in this work. Simulations show that user mobility decreases the rate, and the way of how to utilize multiple light sources has great impact on the performance. In particular, simultaneous power division usage of multiple light sources through user grouping and power allocation brings almost no gain as compared with the case of single light source. On the other hand, time division usage of multiple light sources is capable of compensating for the hardware deficiency and thus increasing the rate greatly. It is found that OMC is not only superior to the conventional scheme with nonadjustable channel gains but also outperforms free space optical scheme at high signal-to-noise ratio region.

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Tracking System for Fast Moving Nodes in Optical Mobile Communication and the Design Rules

Cited by 8 publications

References 24 publications

A Review of Variable-Beam Divergence Angle FSO Communication Systems

A Review of Variable-Beam Divergence Angle FSO Communication Systems

Optical Mobile Communications: Architecture and Enabling Technologies

Performance of Optical Mobile Communications with User Mobility and Multiple Light Sources

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