scholarly journals Analisis Performansi Multi User Detection pada Kanal NLOS untuk Sistem NOMA-VLC

2021 ◽  
Vol 9 (2) ◽  
pp. 482
Author(s):  
BIMA SURYA PRATAMA ◽  
NACHWAN MUFTI ADRIANSYAH ◽  
BRIAN PAMUKTI
Keyword(s):  
Wireless Communication ◽  
Visible Light ◽  
Interference Cancellation ◽  
Multiple Access ◽  
Data Rate ◽  
Line Of Sight ◽  
Optical Wireless Communication ◽  
Optical Wireless ◽  
Better Than ◽  
Non Line Of Sight

ABSTRAKNon-orthogonal multiple access (NOMA), mulai diteliti untuk dapat digunakan sebagai teknik multiple access yang efektif pada jaringan 5G karena teknik ini dapat menghemat bandwidth modulasi. Pada penelitian ini, NOMA diterapkan untuk sistem downlink Visible Light Communivation (VLC). Kami telah melakukan analisis performansi Multi-User Detection (MUD) pada kanal propagasi Non-Line of Sight (NLOS) dengan mempertimbangkan efek reflektor dan efek bayangan (shadowing). Kami juga mempertimbangkan teknik MUD yang digunakan pada penelitian ini yaitu Succesive Interference Cancellation (SIC). Setelah simulasi yang ekstensif, kami menemukan bahwa dengan penerapan SIC sebagai MUD pada sistem NOMA-VLC lebih baik dibandingkan dengan tanpa NOMA. Selain itu, kami juga memperoleh peningkatan data rate sebesar 72 %.Kata kunci: VLC, NOMA, NLOS, MUD, Optical Wireless Communication. ABSTRACTNon-orthogonal multiple access (NOMA), began to be studied to be used as an effective multiple access technique on 5G networks because this technique can save modulation bandwidth. In this research, NOMA is applied to the Visible Light Communivation (VLC) downlink system. We have performed a Multi-User Detection (MUD) performance analysis on Non-Line of Sight (NLOS) propagation channels by considering the reflector and shadowing effects. We also consider the MUD technique used in this study, namely Successive Interference Cancellation (SIC). After extensive simulations, we found that the application of SIC as MUD to the NOMA-VLC system is better than without NOMA. In addition, we also achieve an increase in data rate of 72%.Keywords: VLC, NOMA, NLOS, MUD, Optical Wireless Communication.

scholarly journals Optimum resource allocation in optical wireless systems with energy-efficient fog and cloud architectures

2020 ◽  
Vol 378 (2169) ◽  
pp. 20190188 ◽  
Author(s):  
Osama Zwaid Alsulami ◽  
Amal A. Alahmadi ◽  
Sarah O. M. Saeed ◽  
Sanaa Hamid Mohamed ◽  
T. E. H. El-Gorashi ◽  
...  
Keyword(s):  
Resource Allocation ◽  
Wireless Communication ◽  
Multiple Access ◽  
Mobile Node ◽  
Data Rate ◽  
Optical Wireless Communication ◽  
Optical Wireless ◽  
High Data ◽  
Multiple Users ◽  
Integrated Architecture

Optical wireless communication (OWC) is a promising technology that can provide high data rates while supporting multiple users. The optical wireless (OW) physical layer has been researched extensively, however, less work was devoted to multiple access and how the OW front end is connected to the network. In this paper, an OWC system which employs a wavelength division multiple access (WDMA) scheme is studied, for the purpose of supporting multiple users. In addition, a cloud/fog architecture is proposed for the first time for OWC to provide processing capabilities. The cloud/fog-integrated architecture uses visible indoor light to create high data rate connections with potential mobile nodes. These OW nodes are further clustered and used as fog mini servers to provide processing services through the OW channel for other users. Additional fog-processing units are located in the room, the building, the campus and at the metro level. Further processing capabilities are provided by remote cloud sites. Two mixed-integer linear programming (MILP) models were proposed to numerically study networking and processing in OW systems. The first MILP model was developed and used to optimize resource allocation in the indoor OWC systems, in particular, the allocation of access points (APs) and wavelengths to users, while the second MILP model was developed to optimize the placement of processing tasks in the different fog and cloud nodes available. The optimization of tasks placement in the cloud/fog-integrated architecture was analysed using the MILP models. Multiple scenarios were considered where the mobile node locations were varied in the room and the amount of processing and data rate requested by each OW node was varied. The results help to identify the optimum colour and AP to use for communication for a given mobile node location and OWC system configuration, the optimum location to place processing and the impact of the network architecture. This article is part of the theme issue ‘Optical wireless communication’.

scholarly journals The usage of optical wireless communication for an indoor channel link

2019 ◽  
Vol 20 (5) ◽  
pp. 13-22
Author(s):  
Hasan J. Hasan ◽  
Zeyad Adnan Saleh ◽  
Mazin Ali Abd Ali
Keyword(s):  
Wireless Communication ◽  
New Technology ◽  
Research Field ◽  
Assessment System ◽  
Line Of Sight ◽  
Optical Wireless Communication ◽  
Optical Wireless ◽  
White Leds ◽  
Quality Factor Q ◽  
Non Line Of Sight

Optical wireless communication using white LEDs is the latest research field for next-generation communication by using new technology termed as Light Fidelity or more commonly known as Li-Fi. This term indicate to the data transition in an indoor channel. In this paper we investigated the performance of  Li-Fi for indoor channel and take into account the line of the sight (LOS) and non line of sight (NLOS). There are different metrics used to assessment system such as quality factor (Q-Factor) and bet error rate (BER). The results show that the Li-Fi technology can be working with a good performance. Also, the increase in optical link leads to a weak in the record signal

scholarly journals 345 m underwater optical wireless communication with 270 Gbps data rate based on a green laser diode with NRZ-OOK modulation

2017 ◽  
Vol 25 (22) ◽  
pp. 27937 ◽  
Author(s):  
Xiaoyan Liu ◽  
Suyu Yi ◽  
Xiaolin Zhou ◽  
Zhilai Fang ◽  
Zhi-Jun Qiu ◽  
...  
Keyword(s):  
Wireless Communication ◽  
Laser Diode ◽  
Green Laser ◽  
Data Rate ◽  
Optical Wireless Communication ◽  
Optical Wireless
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