scholarly journals Framework of IoT Services over Unidirectional Visible Lights Communication Networks

Electronics ◽  
2020 ◽  
Vol 9 (9) ◽  
pp. 1349
Author(s):  
So-Yong Kim ◽  
Cheol-Min Kim ◽  
Seok-Joo Koh
Keyword(s):  
Communication Networks ◽  
Visible Light Communication ◽  
Local Area ◽  
Wireless Access ◽  
Data Transport ◽  
Application Layer ◽  
Frequency Channel ◽  
Access Technology ◽  
Distinctive Features ◽  
Session Management

Visible Light Communication (VLC) has been noted as an emerging technology for communications in wireless local area networks. VLC provides some distinctive features over the conventional wireless access technologies, such as Wi-Fi, Bluetooth, or ZigBee. The most prominent feature of VLC is that it can provide more exact location information, since it is based on a particular light. In addition, VLC can reduce the frequency interferences from numerous wireless channels, since it uses a completely different radio frequency channel from the conventional wireless access technologies. Thus, VLC can be used for Internet-of-Things (IoT) services. Nevertheless, up to now, not enough studies on how to provide IoT services over VLC networks have been conducted. In this paper, we propose a framework to provide IoT services in VLC networks. In particular, we will consider the unidirectional VLC network, in which the downlink channel from the VLC transmitter to the VLC receiver is given by using VLC communication, whereas the uplink channel from the VLC receiver to the VLC transmitter is implemented by using another wireless access technology, such as Wi-Fi. This is because most of the VLC receivers, such as mobile phones, cannot support the uplink VLC communication. Based on the framework of IoT services over unidirectional VLC, in this paper, we also propose the VLC–IoT protocol (VIP) which is an application layer protocol for data transport with the session management functionality that can be used to effectively provide IoT services among IoT servers, VLC transmitters and VLC receivers in the networks. The proposed VIP protocol is implemented by using the Cooja simulator. For performance analysis, the proposed scheme is compared with the existing CoAP-based scheme that does not provide the session management. From a variety of simulation experiments, we see that the proposed scheme can provide lower data transmission and handover delays, compared to the existing scheme.

The effects of Tx./Rx. pointing errors on the performance efficiency of local area optical wireless communication networks

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Mahmoud M. A. Eid ◽  
Ahmed Nabih Zaki Rashed ◽  
Mohd. Sultan Ahammad ◽  
Bikash Kumar Paul ◽  
Kawsar Ahmed
Keyword(s):  
Wireless Communication ◽  
Communication Networks ◽  
Local Area ◽  
Cavity Surface ◽  
Wireless Communication Networks ◽  
Q Factor ◽  
Optical Wireless Communication ◽  
Optical Wireless ◽  
Pointing Errors ◽  
Emitting Lasers

Abstract This study presents the effects of Tx./Rx. pointing errors on the performance efficiency of local area optical wireless communication networks. The received signal power and max Q factor are measured in the presence of vertical-cavity surface-emitting lasers (VCSELs) bias current and modulation current at maximum propagation distance for the wireless network. The signal is enhanced with increasing of bias and modulation peak currents of the VCSEL device. The optimum received power and max. Q factor is also examined at Tx./Rx. the pointing error of 0.1 mrad and propagation reach of 5 km at available bit rates transmission of 10 Gb/s.

Dynamic Hyperchaotic Key Generation Using Optical Orthogonal Frequency Division Multiplexing-based Visible Light Communication Networks

2021 ◽  
Author(s):  
Mohammed Alresheedi ◽  
YAHYA AL-MOLIKI ◽  
Yahya Al-Harthi ◽  
Ali Alqahtani
Keyword(s):  
Visible Light ◽  
Communication Networks ◽  
Orthogonal Frequency Division Multiplexing ◽  
Average Power ◽  
Visible Light Communication ◽  
Frequency Division Multiplexing ◽  
Key Generation ◽  
Frequency Division ◽  
Degree Of Protection ◽  
Communication Time

Abstract This paper introduces an optical orthogonal frequency division multiplexing (OFDM)-based hyperchaotic key generation encryption approach that can improve confidentiality in visible light communication (VLC) networks. Using a hyperchaotic four-dimensional method, the bipolar real-valued OFDM signal can be used for constructing dynamic cypher keys modified at every frame over the communication time, resulting in a superior degree of protection against statistical and correlation attacks. In accordance with our findings, this approach decreases the ratio of peak-to-average power of the transmitted signal, and enhances the bit error rate efficiency and secrecy capacity of the OFDM-based VLC network, which improves confidentiality.

Wireless Access Networks for Smart Cities

2015 ◽  
pp. 266-297 ◽  
Author(s):  
Hervé Rivano ◽  
Isabelle Augé-Blum ◽  
Walid Bechkit ◽  
Khaled Boussetta ◽  
Marco Fiore ◽  
...  
Keyword(s):  
Quality Of Life ◽  
Communication Networks ◽  
Smart Cities ◽  
Main Tool ◽  
Urban Environments ◽  
Access Networks ◽  
Wireless Access ◽  
Health Resource ◽  
Wireless Access Networks

Smart cities are envisioned to enable a vast amount of services in urban environments, so as to improve mobility, health, resource management, and, generally speaking, citizens' quality of life. Most of these services rely on pervasive, seamless and real-time access to information by users on the move, as well as on continuous exchanges of data among millions of devices deployed throughout the urban surface. It is thus clear that communication networks will be the key to enabling smart city solutions, by providing their core support infrastructure. In particular, wireless technologies will represent the main tool leveraged by such an infrastructure, as they allow device mobility and do not have the deployment constraints of wired architectures. In this Chapter, we present different wireless access networks intended to empower future smart cities, and discuss their features, complementarity and interoperability.

Detecting Sexual Harassment in Workplace Electronic Communications Networks

2019 ◽  
pp. 44-79
Author(s):  
Jonathan Bishop
Keyword(s):  
Sexual Harassment ◽  
Communication Networks ◽  
Local Area Network ◽  
Education Institution ◽  
Local Area ◽  
Area Network ◽  
Environmental Resources ◽  
Human Resource Managers ◽  
Electronic Communications ◽  
Resource Managers

Sexual harassment has been a problem within organisations for some time. Its manifestation in electronic communication networks can be seen to amount to cyber-bullying or cyber-stalking. Through looking at records relating to an instance of sexual harassment at a higher education institution, including from that member of staff's workplace, and those created by referrals to the police, the court service, and their workplace, this chapter shows how a piece of assistive technology called the ‘Protective Technology for Ensuring Guardianship of Environmental Resources' (PROTEGER) can automatically detect sexual harassment narratives. In this context, ‘environmental resources' should refer to both humans and documents. Human resource managers would be better equipped to deal with disputes between staff if PROTEGER was running on their local area network as it might not be a matter of one member of staff's word against another's.

Mobile Commerce and the Evolving Wireless Technologies

2011 ◽  
pp. 2580-2583
Author(s):  
Pouwan Lei ◽  
Jia Jia Wang
Keyword(s):  
Wireless Communication ◽  
Communication Networks ◽  
Mobile Communication ◽  
Communication Systems ◽  
Smart Phone ◽  
Local Area ◽  
Handheld Devices ◽  
The Internet ◽  
Wireless Services ◽  
Wireless Communication Network

The mobile phone industry has experienced an explosive growth in recent years. The emerging markets such as China, India, and Brazil contribute this growth. In China, the number of mobile subscribers has already surpassed the number of fixed landline phone subscribers. In Korea and Japan, there is an explosion of mobile and wireless services. The United States are joining too and there were 207.9 million subscribers in 2005 (CTIA, 2006). Mobile e-commerce (m-commerce) makes business mobility a reality; mobile users could access the Internet at any time, from anywhere with handheld devices or laptop. A 3G enabled smart phone enables you to access a wide range of services anywhere and anytime. For example, you can send and receive e-mail, make cinema and restaurant reservations and pay for them, check real train time, look at digital maps, download music and games, and also browse the Internet. Mobile and wireless services are ranging from mobile communication networks to wireless local area networks. The service provided by mobile communication systems has achieved huge success as mobile and wireless communication technologies are converging at fast speed. We will study mobile and wireless communication in relation to mobile phones. Hence, m-commerce is defined as electronic commerce carried out in handheld devices such as smart phone through mobile and wireless communication network.

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